WO2013166583A1 - Enhancement of fischer-tropsch process for hydrocarbon fuel formulation in a gtl environment - Google Patents
Enhancement of fischer-tropsch process for hydrocarbon fuel formulation in a gtl environment Download PDFInfo
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- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
- C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2/00—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon
- C10G2/30—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon from carbon monoxide with hydrogen
- C10G2/32—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon from carbon monoxide with hydrogen with the use of catalysts
- C10G2/33—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon from carbon monoxide with hydrogen with the use of catalysts characterised by the catalyst used
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
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- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
- C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
- C01B3/38—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2/00—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G50/00—Production of liquid hydrocarbon mixtures from lower carbon number hydrocarbons, e.g. by oligomerisation
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/04—Liquid carbonaceous fuels essentially based on blends of hydrocarbons
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/04—Liquid carbonaceous fuels essentially based on blends of hydrocarbons
- C10L1/08—Liquid carbonaceous fuels essentially based on blends of hydrocarbons for compression ignition
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- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
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- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/02—Processes for making hydrogen or synthesis gas
- C01B2203/0205—Processes for making hydrogen or synthesis gas containing a reforming step
- C01B2203/0227—Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step
- C01B2203/0233—Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step the reforming step being a steam reforming step
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- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/02—Processes for making hydrogen or synthesis gas
- C01B2203/0205—Processes for making hydrogen or synthesis gas containing a reforming step
- C01B2203/0227—Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step
- C01B2203/0244—Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step the reforming step being an autothermal reforming step, e.g. secondary reforming processes
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- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/06—Integration with other chemical processes
- C01B2203/062—Hydrocarbon production, e.g. Fischer-Tropsch process
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- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/12—Feeding the process for making hydrogen or synthesis gas
- C01B2203/1205—Composition of the feed
- C01B2203/1211—Organic compounds or organic mixtures used in the process for making hydrogen or synthesis gas
- C01B2203/1235—Hydrocarbons
- C01B2203/1241—Natural gas or methane
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- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/14—Details of the flowsheet
- C01B2203/148—Details of the flowsheet involving a recycle stream to the feed of the process for making hydrogen or synthesis gas
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1025—Natural gas
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- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
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- C10G2300/4081—Recycling aspects
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- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/40—Characteristics of the process deviating from typical ways of processing
- C10G2300/42—Hydrogen of special source or of special composition
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/04—Diesel oil
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- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/08—Jet fuel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Definitions
- the present invention relates to the modification of the Fischer-Tropsch sequence of operations including the Fischer-Tropsch process for the production of hydrocarbon fuels in an efficient manner.
- the Fischer-Tropsch (FT) process converts hydrogen and carbon monoxide (commonly known as syngas) into liquid hydrocarbon fuels, examples of which include synthetic diesel, naphtha, kerosene, aviation or jet fuel and paraffinic wax.
- syngas hydrogen and carbon monoxide
- liquid hydrocarbon fuels examples of which include synthetic diesel, naphtha, kerosene, aviation or jet fuel and paraffinic wax.
- the natural gas and natural gas liquids are thermally converted using heat and pressure in the presence of catalyst to produce a hydrogen rich syngas containing hydrogen and carbon monoxide.
- the synthetic fuels are very appealing from an environmental point of view, since they are paraffinic in nature and substantially devoid of contamination.
- Synthetic diesel or syndiesel fuels significantly reduce nitrous oxide and particulate matter and are an efficient transportation fuel with lower green house gas (GHG) emissions, when compared with petroleum based diesel fuel and other transportation fuels.
- the syndiesel fuels can also be very effective in that they can be added to petroleum based diesel fuels to enhance their performance.
- the patent teaches a process for synthesizing hydrocarbons where initially, a synthesis gas stream is formulated in a syngas generator.
- the synthesis gas stream comprises primarily hydrogen and carbon monoxide.
- the process involves catalytically converting the synthesis gas stream in a synthesis reaction to produce hydrocarbons and water followed by the generation of hydrogen-rich stream in the hydrogen generator.
- the process indicates that the hydrogen generator is separate from the syngas generator ⁇ supra) and that the hydrogen generator comprises either a process for converting hydrocarbons to olefins, a process for catalytically dehydrogenating hydrocarbons, or a process for refining petroleum, and a process for converting hydrocarbons to carbon filaments.
- the final step in the process in its broadest sense, involves consumption of hydrogen from the hydrogen-rich stream produced in one or more processes that result and increase value of the hydrocarbons or the productivity of the conversion of the hydrocarbons from the earlier second mentioned step.
- the Espinoza et al. process is an excellent gas to a liquid process link to gasoline production from natural gas using naphtha reformation to make the gasoline product.
- the excess hydrogen could be used to enhance the productivity of conversion.
- the liquid fuels begin with the organic material, typically biomass as a solid feedstock.
- the process involves a stage for the gasification of the solid feedstock, a stage for purification of synthesis gas and subsequently a stage for transformation of the synthesis gas into a liquid fuel.
- stage a) The solid feedstock is subjected to a gasification stage so as to convert said feedstock into synthesis gas comprising carbon monoxide and hydrogen, b) the synthesis gas that is obtained in stage a) is subjected to a purification treatment that comprises an adjustment for increasing the molar ratio of hydrogen to carbon monoxide, H2/CO, up to a predetermined value, preferably between 1.8 and 2.2,
- stage b) the purified synthesis gas that is obtained in stage b) is subjected to a conversion stage that comprises the implementation of a Fischer-Tropsch-type synthesis so as to convert said synthesis gas into a liquid effluent and a gaseous effluent,
- the liquid effluent that is obtained in stage c) is fractionated so as to obtain at least two fractions that are selected from the group that consists of: a gaseous fraction, a naphtha fraction, a kerosene fraction, and a gas oil fraction, and e) at least a portion of the naphtha fraction is recycled in gasification stage.”
- an oxidizing agent such as water vapour and gaseous hydrocarbon feedstocks such as natural gas with the recycled naphtha
- the process instructs the conversion of natural gas or other fossil fuels to higher hydrocarbons
- the natural gas or the fossil fuels is reacted with steam and oxygenic gas in a reforming zone to produce synthesis gas which primarily contains hydrogen, carbon monoxide and carbon dioxide.
- the synthesis gas is then passed into a Fischer-Tropsch reactor to produce a crude synthesis containing lower hydrocarbons, water and non-converted synthesis gas.
- the crude synthesis stream is separated in a recovery zone into a crude product stream containing heavier hydrocarbons, a water stream and a tail gas stream containing the remaining constituents.
- the tail gas stream is reformed in a separate steam reformer with steam and natural gas and then the sole reformed tail gas is introduced into the gas stream before being fed into the Fischer- Tropsch reactor.
- the patentees primarily focused on the production of the high carbon content syngas in a GTL environment using an ATR as crude synthesis stream and reforming the synthesis tail gas in an SMR with natural gas addition to create optimum conditions that feed to the Fischer- Tropsch reactor.
- One object of the present invention is to provide an improved Fischer-Tropsch based synthesis process for synthesizing hydrocarbons with a substantially increased yield.
- step (c) re-circulating said enhanced hydrogen rich stream from step (c) for conversion in step (b) to enhance the synthesis of hydrocarbons.
- the present invention amalgamates, in a previously unrecognized combination, a series of known unit operations into a much improved synthesis route for production of synthetic hydrocarbon fuels.
- This process engages a counterintuitive step, namely, the removal of a production fraction, namely the naphtha, which, despite being a refined product, is then effectively destroyed making use of the naphtha as a feedstock for a syngas generator and then recycled into the Fischer- Tropsch process.
- This keystone unit operation is propitious since it works in concert with all of the other precursor operations which, of their own right, are highly effective.
- the process may include an autothermal reforming unit (ATR) operation as a syngas generator.
- ATR autothermal reforming unit
- autothermal reforming employs carbon dioxide and oxygen, or steam, in a reaction with light hydrocarbon gases like natural gas to form syngas. This is an exothermic reaction in view of the oxidation procedure.
- the autothermal reformer employs carbon dioxide
- the hydrogen to carbon monoxide ratio produced is 1 : 1
- the autothermal reformer uses steam the ratio produced is approximately 2.5: 1.
- One of the more significant benefits of using the ATR is realized in the variability of the hydrogen to carbon monoxide ratio.
- the process may include a steam methane reformer (SMR) operation as a syngas generator.
- SMR steam methane reformer
- steam methane reforming employs steam in a reaction with light hydrocarbon gases like natural gas and pre- reformed naphtha to form syngas in an indirect fired heater configuration. This is an endothermic reaction where external heat energy is required to support the reaction.
- the hydrogen to carbon monoxide ratio produced ranges from 3: 1 to 5: 1.
- One of the more significant benefits of using the SMR is realized in the capability of generating relatively high hydrogen to carbon monoxide ratios, particularly attractive where excess hydrogen is needed for other operations, such as for the hydrocarbon upgrader.
- light hydrocarbon gas as by-product from the Fischer-Tropsch reaction and hydrocarbon upgrader processing, commonly known as FT Tailgas and Upgrader offgases
- the process is capable of converting at least 50% or greater of all the carbon introduced to the process to syndiesel with an increase in production of syndiesel and synthetic jet fuel, as compared to conventional Fischer-Tropsch operation and without the production of any hydrocarbon by-products. This obviously has significant economic benefits.
- a further aspect of one embodiment of the present invention is to provide a process for synthesizing hydrocarbons, comprising the steps of:
- an improved gas to liquids circuit comprising:
- the amalgamation of the GTL process to a conventional hydrocarbon liquids extraction plant facilitates transformation of the low value natural gas byproducts to beneficially economic synthetic fuels.
- a method for converting natural gas byproducts to synthetic fuel comprising:
- a method for converting natural gas byproducts to at least one of synthetic diesel and synthetic jet fuel comprising:
- a method for increasing the volume yield of syndiesel produced in a gas to liquids processing circuit having syngas generator, syngas conditioning circuit and upgrading circuit comprising:
- a method for increasing the volume yield of syndiesel produced in a gas to liquids processing circuit having syngas generator, syngas conditioning circuit and upgrading circuit comprising:
- Figure 1 is a process flow diagram of methodology known in the prior art using autothermal reformer technology
- Figure 2 is a process flow diagram of methodology known in the prior art using steam methane reformer technology
- Figure 3 is a process flow diagram similar to Figure 1, illustrating a first embodiment of the present invention
- Figure 4 is a process flow diagram similar to Figure 2, illustrating a further variation of the present invention.
- Figure 5 is a process flow diagram of a still further embodiment of the present invention showing the combination of autothermal and steam methane reforming technologies
- Figure 6 is a process flow diagram illustrating a still further variation of the present methodology, showing the integration of the autothermal and steam methane technologies
- Figure 7 is a schematic diagram illustrating a conventional hydrocarbon liquids extraction plant.
- Figure 8 is a process flow diagram illustrating a still further variation of the present methodology within a natural gas processing facility
- the present invention has applicability in the fuel synthesis art.
- FIG. 1 a process flow diagram of a circuit for converting gas-to -liquids with the result being the production of naphtha and syndiesel.
- the process is generally denoted by numeral 10 and begins with a natural gas supply 12, which feedstock can be in the form of raw field gas or pipeline quality treated gas, usually with bulk sulfur and hydrocarbon liquids removed.
- the natural gas is then pre-treated in a pre-treatment unit 20 to which steam 14, hydrogen 18 and optionally carbon dioxide 19 may be added as required.
- the pre- treatment unit may include, as is well known to those skilled in the art, such unit operations as a feed gas hydrotreater, sulfur removal and quard operation and a pre- reformer to produce a clean vapour feed stream 22 for the syngas generator, denoted in Figure 1 as an autothermal reformer (ATR) unit 24.
- the ATR 24 may be any suitable catalytic partial oxidization unit, however, as an example, an ATR that is useful in this process is that of Haldor Topsoe A/S., Uhde GmbH and CB&I Lummus Company.
- the ATR process and apparatus have been found to be effective in the methodology of the present invention and will be discussed hereinafter.
- the so formed syngas is then subjected to cooling and cleaning operations 28 with subsequent production of steam 32 and removal of produced water at 34.
- a water gas shift reaction WGS
- WGS water gas shift reaction
- the process may optionally use the supplemental addition of hydrogen 42 to maximize the conversion to syndiesel.
- the raw syngas may be further treated, as is well known to those skilled in the art, in various steps of scrubbing units and guard units to remove ammonia and sulfur compounds to create a relatively pure clean syngas 30 suitable for use in a Fischer- Tropsch unit.
- a carbon dioxide removal unit (not shown) may optionally be included in the clean syngas stream 30 to reduce the inert load and maximize the carbon monoxide concentration to the Fischer-Tropsch unit 40.
- the syngas is then transferred to a Fischer-Tropsch reactor 40 to produce the hydrocarbons and water.
- the so formed hydrocarbons are then passed on to a product upgrader, generally denoted as 50, and commonly including a hydrocarbon cracking stage 52, a product fractionating stage 60 with naphtha being produced at 66 as a fraction, as well as diesel 68 as an additional product.
- the diesel 68 formulated in this process is commonly known as syndiesel.
- this process results in the formulation of 1000 barrels per day (bbl/day) based on 10 to 15 thousand standard cubic feet /day (MSCFD) of natural gas.
- a source of hydrogen 74 is to be supplemented to the hydrocarbon cracking unit 52 denoted as streams 54.
- energy 32 from the syngas generator 24, typically in the form of steam may be used to generate power and this is equally true of the Fischer-Tropsch reactor 40 creating energy 46.
- Table 1 establishes a comparison between FT diesel and conventional petroleum based diesel.
- Naphtha 66 can be generally defined as a distilled and condensed fraction of the Fischer-Tropsch FT hydrocarbon liquids, categorized by way of example with a typical boiling range of -40°C to 200°C, more preferred 30°C to 200°C, and more preferred 80°C to 120°C.
- the specific naphtha specification will be optimized for each application to maximize syndiesel production, maximize the recovery of light liquid hydrocarbon fractions such as propane and butane and partially or fully eliminate the naphtha by-product.
- Suitable examples of FT reactors include fixed bed reactors, such as tubular reactors, and multiphase reactors with a stationary catalyst phase and slurry-bubble reactors.
- a fixed bed reactor the FT catalyst is held in a fixed bed contained in tubes or vessels within the reactor vessel.
- the syngas flowing through the reactor vessel contacts the FT catalyst contained in the fixed bed.
- the reaction heat is removed by passing a cooling medium around the tubes or vessels that contain the fixed bed.
- the FT catalyst particles are suspended in a liquid, e.g., molten hydrocarbon wax, by the motion of bubbles of syngas sparged into the bottom of the reactor.
- H 2 and CO combine via polymerization to form hydrocarbon compounds having varying numbers of carbon atoms.
- 70% conversion of syngas to FT liquids takes place in a single pass of the FT reactor unit.
- a supplemental supply of hydrogen 42 may be provided to each subsequent FT reactor stages to enhance the conversion performance of the subsequent FT stages.
- products are sent to the separation stage, to divert the unconverted syngas and light hydrocarbons (referred to as FT tailgas), FT water and the FT liquids, which are directed to the hydrocarbon upgrader unit denoted as 50.
- the FT tailgas becomes the feed stream for subsequent FT stages or is directed to refinery fuel gas in the final FT stage.
- the upgrader unit typically contains a hydrocracking step 52 and a fractionation step 60.
- Hydrocracking denoted as 52 used herein is referencing the splitting an organic molecule and adding hydrogen to the resulting molecular fragments to form multiple smaller hydrocarbons (e.g., CioH 22 + H 2 ⁇ C4H10 and skeletal isomers + C 6 Hi4). Since a hydrocracking catalyst may be active in hydroisomerization, skeletal isomerization can occur during the hydrocracking step. Accordingly, isomers of the smaller hydrocarbons may be formed.
- Hydrocracking a hydrocarbon stream derived from Fischer-Tropsch synthesis preferably takes place over a hydrocracking catalyst comprising a noble metal or at least one base metal, such as platinum, cobalt- molybdenum, cobalt-tungsten, nickel-molybdenum, or nickel-tungsten, at a temperature of from about 550°F to about 750°F (from about 288°C to about 400°C) and at a hydrogen partial pressure of about 500 psia to about 1,500 psia (about 3,400 kPa to about 10,400 kPa).
- a hydrocracking catalyst comprising a noble metal or at least one base metal, such as platinum, cobalt- molybdenum, cobalt-tungsten, nickel-molybdenum, or nickel-tungsten, at a temperature of from about 550°F to about 750°F (from about 288°C to about 400°C) and at a hydrogen partial pressure of about 500 psia to about 1,500
- the hydrocarbons recovered from the hydrocracker are further fractionated in the fractionation unit 60 and refined to contain materials that can be used as components of mixtures known in the art such as naphtha, diesel, kerosene, jet fuel, lube oil, and wax.
- the combined unit consisting of the hydrocracker 52 and hydrocarbon fractionator 60 are commonly known as the hydrocarbon upgrader 50.
- several hydrocarbon treatment methods can form part of the upgrader unit depending on the desired refined products, such as additional hydrotreating or hydroisomerization steps.
- the hydrocarbon products are essentially free of sulfur.
- the diesel may be used to produce environmentally friendly, sulfur-free fuel and/or blending stock for diesel fuels by using as is or blending with higher sulfur fuels created from petroleum sources.
- Unconverted vapour streams rich in hydrogen and carbon monoxide and commonly containing inert compounds such as carbon dioxide, nitrogen and argon are vented from the process as FT tail gas 44, hydrocracker (HC) offgas 56 and fractionator (frac) offgas 62.
- FT tail gas 44 hydrocracker (HC) offgas 56 and fractionator (frac) offgas 62.
- HC hydrocracker
- frac fractionator
- These streams can be commonly collected as refinery fuel gas 64 and used as fuel for furnaces and boilers to offset the external need for natural gas.
- These streams may also be separated and disposed of separately based on their unique compositions, well known to those skilled in the art.
- a supplemental supply of hydrogen 74 may be required for the HC unit 54 and the natural gas hydrotreater 18.
- This hydrogen supply can be externally generated or optionally provided from the syngas stream 30 using a pressure swing absorption or membrane unit (not shown), although this feature will increase the volume of syngas required to be generated by the syngas generator 24.
- useable energy commonly generated as steam from the syngas stage may be used to generate electric power.
- useable energy that can be drawn from the Fischer-Tropsch unit owing to the fact that the reaction is very exothermic and this represents a useable source of energy.
- This is denoted by numeral 46.
- Figure 2 to further illustrate the prior art, shown is an alternate process flow diagram of a circuit for converting gas-to -liquids with the result being the production of naphtha and syndiesel.
- the components of this process are generally the same as that described in Figure 1 with the common elements denoted with the same numbers.
- the syngas generator is changed to be a steam methane reformer (SMR) 25.
- SMR 25 may be any suitable catalytic conversion unit , however, as an example, an SMR that is useful in this process is that of Haldor Topsoe A/S., Uhde GmbH., CB&I Lummus Company, Lurgi GmbH/Air Liquide mining, Technip Inc, Foster Wheeler and others.
- the SMR process and apparatus have been found to be effective in executing the methodology of the present invention to be discussed hereinafter.
- the same effectively involves a thermal catalytic stage which uses steam supply and heat energy to convert the preconditioned natural gas feed to a syngas 27 containing primarily hydrogen and carbon dioxide.
- An advantage of the SMR technology is that the syngas is very rich in hydrogen with a ratio of hydrogen to carbon monoxide typically greater than 3.0: 1. This exceeds the typical syngas ratio of 2.0: 1 usually preferred for the Fischer- Tropsch process.
- a hydrogen separation unit 33 may be used to provide the hydrogen requirement 74 for the GTL process.
- the hydrogen separator may be a pressure swing adsorption or a membrane separation unit.
- the SMR does not require an oxygen source as with the ATR technology, the SMR process requires external heat energy, typically provided by natural gas 13 or optionally by use of the excess refinery gas 76 derived from the FT tail gas 44 or upgrader offgases 56 & 62.
- the SMR 25 may contain any suitable catalyst and be operated at any suitable conditions to promote the conversion of the hydrocarbon to hydrogen H 2 and carbon monoxide.
- the addition of steam and natural gas may be optimized to suit the desired production of hydrogen and carbon monoxide.
- natural gas or any other suitable fuel can be used to provide energy to the SMR reaction furnace.
- the catalyst employed for the steam reforming process may include one or more catalytically active components such as palladium, platinum, rhodium, iridium, osmium, ruthenium, nickel, chromium, cobalt, cerium, lanthanum, or mixtures thereof.
- the catalytically active component may be supported on a ceramic pellet or a refractory metal oxide. Other forms will be readily apparent to those skilled.
- FIG. 3 shown is a preliminary embodiment of the technology of the instant invention. As is evinced from Figure 3, many of the preliminary steps are common with that which is shown in Figure 1. At least a portion of the less desirable FT product, naphtha 66 is recycled as ATR 24 feed through the pre-treatment unit 20 and is fully destroyed and converted to additional syngas. Based on the full recycle and conversion of the naphtha, the diesel production increase of greater than 10% can be realized, with the elimination of an undesirable by-product stream.
- a hydrogen separation unit is added to remove excess hydrogen from the enhanced syngas for supply to the FT unit 40 and product upgrader 50;
- a portion of hydrogen rich streams not desired to be used as fuel, separately or combined all together as refinery fuel 64, can be recycled back 102 to the ATR 24 by way of the pre-treatment unit 20;
- a optional carbon dioxide removal stage 21 may be installed on the FT syngas feedstream to reduce the inert vapour load on the FT unit 40, and at least a portion of the carbon dioxide 12 may be reintroduced into the ATR 24 by way of the pre-treatment unit 20 for purposes of reverse shifting and recycling carbon to enhance the production of syndiesel.
- Figure 4 sets forth a further interesting variation on the overall process that is set forth in Figure 2 and 3. As is evinced from Figure 4, many of the preliminary steps are common with that which is shown in Figure 2. In this variation, and similar to the variation described by Figure 3, the process employs the recycle of at least a portion of the naphtha 100 to enhance the production of syndiesel using a SMR syngas generator. Similarly the optional features described for Figure 3 can equally apply to Figure 4.
- FIG. 5 A further variation of the overall process embraced by the technology discussed herein is shown in Figure 5.
- the process flow as shown in Figure 5 combines the unit operations of the SMR 25 and the ATR 24 syngas generators with the primary embodiment of this invention, namely the recycle of at least a portion of the naphtha, to create the maximum conversion of carbon to syndiesel.
- the optional features as described in Figures 3 and 4, combined with the naphtha recycle may create even further benefits to further enhancement of syndiesel production without any nonuseful by-products.
- the sizing of the ATR and SMR syngas generators are specific to each feed gas compositions and site specific parameters to optimize the production of syndiesel.
- feedstreams for the ATR and SMR may be common or uniquely prepared in the pre-treatment unit to meet specific syngas compositions desired at 26 and 27.
- the hydrogen rich syngas stream or portion thereof, from the SMR can be optionally preferred as the feed stream to the hydrogen separation unit 33.
- the preferred steam to carbon ratios at streams 22 and 23 for the ATR and SMR may be different, thereby requiring separate pre-treatment steps.
- FIG. 6 is yet another variation of the overall process according to the present invention combining the benefits of Figures 3 and 4.
- both the SMR and ATR unit operations, combined with the naphtha recycle are amalgamated into an integrated unit operation whereby the heat energy created by the ATR 24 becomes the indirect heat energy required by the SMR reactor tubes 25.
- This embodiment allows the integrated ATR/SMR unit, the XTR to be strategically designed to maximize the carbon conversion to syndiesel by creating the optimum Fischer-Tropsch 40 and hydrogen separator 33 syngas feed with optimum hydrogen to carbon monoxide ratio and the minimum quantity of natural gas, steam and oxygen, while maximizing syndiesel production without the production of any nonuseful by-product. All other optional features remain the same as Figures 3, 4 and 5.
- "integrated" in reference to the ATR/SMR means a merged unit where the two distinct operations are merged into one.
- FIG. 7 shown is a schematic illustration of a conventional hydrocarbon liquids extraction plant commonly known in the art.
- the overall plant is denoted with numeral 1 10.
- the hydrocarbon liquid extraction gas plant typically includes refrigerated dewpoint control units, lean oil absorption plants or deep cut turbo expander plants. All of these process units employ an extraction technique to remove ethane, propane, butane and pentanes as well as higher alkanes referred to as pentanes plus C 5 + (typically referred as condensates) singly or as blends from the methane gas stream. These techniques are well known and will not be elaborated upon here. Generally speaking, any of the above mentioned alkanes other than the C5+ alkanes can remain in the sales gas to increase heat content provided that the sales gas hydrocarbon dewpoint specification is not exceeded.
- the original feedstock namely raw natural gas 1 14 is introduced into the plant 1 12 at which point the C5+ condensates can be removed at 1 16 with the passage of the methane 1 18, ethane 120, and propane and butane 122 introduced into a gas to liquids GTL plant 124, which includes a Fischer-Tropsch unit.
- At least a portion of the methane 1 18, ethane 120 and butane and propane 122 can be removed as sales gas 126 or in the case of the ethane 120 this may be supplied optionally to the petrochemical market.
- propane (C3) and butane (C4) 122 this may be entirely removed or a portion thereof from the circuit at 128.
- the alkane feedstock is passed into the gas to liquid plant 124 by use of the known components of the gas to liquid plant including, namely the syngas generator, syngas conditioning circuit, and upgrading circuit, the result is synthetic diesel fuel 130 and/or synthetic jet fuel 132 as illustrated in the Figure.
- the GTL plant 124 is capable of receiving the combined raw gas stream with primarily the C5+ components removed for converting the rich raw natural gas to synthetic diesel and synthetic jet fuel. It has been found that over dry methane gas feed, the GTL plant 124 will generate a 20% to 30% increase in synthetic diesel product yield using the rich natural gas feed. It is also been noted that a significant increase in synthetic diesel production is realized as the composition contains high concentrations of butane and propane. It has further been found that if the feed is restricted to 100% propane or butane, the synthetic diesel production increases two to three times respectively to approximately 200% to 300% of the production based on dry methane gas.
- the feedstock can take any form and can include any combination of the byproducts or any of the byproducts singly, namely, the C 2 +, C3+, C 3 and C 4 and/or C5+.
- the arrangement is particularly beneficial, since the operator can select an option to adjust the economical business model to optimize the economics for a particular market situation.
- the methodology facilitates an increased yield of synthetic fuel production by use of natural gas byproducts with or without natural gas. This advantageously provides process flexibility and definition economics.
Abstract
Description
Claims
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JP2015510587A JP2015517586A (en) | 2012-05-09 | 2013-05-06 | Improved Fischer-Tropsch process for the preparation of hydrocarbon fuels in the GTL environment |
MX2014013579A MX370549B (en) | 2012-05-09 | 2013-05-06 | Enhancement of fischer-tropsch process for hydrocarbon fuel formulation in a gtl environment. |
CA2843088A CA2843088C (en) | 2012-05-09 | 2013-05-06 | Enhancement of fischer-tropsch process for hydrocarbon fuel formulation in a gtl environment |
CN201380024263.XA CN104508091B (en) | 2012-05-09 | 2013-05-06 | The enhancing for the fischer-Te Luopuxi technique prepared in GTL environment for hydrocarbon fuel |
IN2395MUN2014 IN2014MN02395A (en) | 2012-05-09 | 2013-05-06 | |
EP13787536.5A EP2847301B1 (en) | 2012-05-09 | 2013-05-06 | Process for hydrocarbon fuel formulation in a gtl environment |
RU2014149276A RU2665691C2 (en) | 2012-05-09 | 2013-05-06 | Enhanced fischer-tropsch process for hydrocarbon fuel formulation in gtl environment |
BR112014027974-8A BR112014027974B1 (en) | 2012-05-09 | 2013-05-06 | Improvement of the Fischer-Tropsch process for hydrocarbon fuel formulation in a gtl environment |
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- 2013-05-06 BR BR112014027974-8A patent/BR112014027974B1/en active IP Right Grant
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US9212319B2 (en) | 2015-12-15 |
BR112014027974A2 (en) | 2021-04-20 |
JP2015517586A (en) | 2015-06-22 |
CN104508091A (en) | 2015-04-08 |
JP2018083954A (en) | 2018-05-31 |
EP2847301B1 (en) | 2020-07-22 |
MX370549B (en) | 2019-12-17 |
EP2847301A4 (en) | 2016-04-13 |
EP2847301A1 (en) | 2015-03-18 |
BR112014027974B1 (en) | 2022-03-15 |
CN104508091B (en) | 2019-03-08 |
CA2843088C (en) | 2015-12-08 |
RU2014149276A (en) | 2016-06-27 |
CA2776369C (en) | 2014-01-21 |
MX2014013579A (en) | 2015-05-11 |
IN2014MN02395A (en) | 2015-08-21 |
US20210071089A1 (en) | 2021-03-11 |
US20140206780A1 (en) | 2014-07-24 |
RU2665691C2 (en) | 2018-09-04 |
CA2776369A1 (en) | 2012-07-17 |
CA2843088A1 (en) | 2013-11-14 |
US20160096997A1 (en) | 2016-04-07 |
US20180223192A1 (en) | 2018-08-09 |
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