WO1994001204A1 - Method and device for regulating the humidity of a gas flow and at the same time purifyng it of undesired acid or alkaline gasses - Google Patents
Method and device for regulating the humidity of a gas flow and at the same time purifyng it of undesired acid or alkaline gasses Download PDFInfo
- Publication number
- WO1994001204A1 WO1994001204A1 PCT/EP1993/001773 EP9301773W WO9401204A1 WO 1994001204 A1 WO1994001204 A1 WO 1994001204A1 EP 9301773 W EP9301773 W EP 9301773W WO 9401204 A1 WO9401204 A1 WO 9401204A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- membrane
- gas flow
- alkaline
- gasses
- acid
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/268—Drying gases or vapours by diffusion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/1435—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification comprising semi-permeable membrane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F6/00—Air-humidification, e.g. cooling by humidification
Definitions
- the invention relates to a method for regulating the humidity of a gas flow and purifying that gas flow of, for example, acid or alkaline gasses, whereby the gas flow is led along a side - the retentive side - of a membrane, through which water vapour can diffuse and on the other ⁇ side of which - the permeation side - a hydroscopic liquid flows.
- a practical and continuously usable method of this sort is descri- 5 bed in US patent no. 4.915.838: in order to remove water vapour from air, the air flow which is to be dried is led along the retentive side of a micro-porous membrane.
- the membrane which is used is a so-called hollow-fibre membrane.
- a hydroscopic liquid flows on the permeation side of the membrane. 0 Water vapour from the gas flow diffuses through the pores of the mem ⁇ brane from the retentive side to the permeation side and is there ab ⁇ sorbed and carried off by the hydroscopic liquid.
- the invention relates to a method with which the regulation of the humidity of an air flow and the removal therefrom of undesired gasses, which are absorbed well in alkaline, acid or neutral watery solutions, can be achieved simultaneously in a single process.
- the method accor ⁇ ding to the invention is characterized to that end in that a membrane is used through which the gasses concerned which are to be removed can also diffuse and that the hydroscopic liquid is mixed with a watery component, in such a manner that the water content of the mixture is adjusted to the desired humidity balance of the gas flow which is to be treated and that the composition thereof is adjusted to the solubility therein of the, for example, acid and alkaline components which are to be removed from the gas flow.
- the water content of the hydroscopic mixture is decisive for the humidity balance which is to be adjusted.
- the membrane can allow water vapour to pass through in both directions - from the retentive side to the permeation side and vice-versa, water vapour can be both added to the gas flow which is to be treated and can be removed there- from.
- the gas component(s) concerned from the retentive side of the membrane to the permeation side thereof, followed by absorption in the watery, possibly acid or alkaline com ⁇ ponent of the hydroscopic mixture which flows along the permeation side of the membrane that (those) gas component(s) are removed from the gas flow which is to be treated simultaneously with the adjustment of the humidity.
- the watery component must be of such a com ⁇ position, that the solubility of the component which is to be removed is increased and/or is accelerated by a physical or chemical interac ⁇ tion.
- the composition must be adjusted to the nature of the gasses which are to be removed. For example, strong or weak organic or anor ⁇ ganic acids or alkalines are dissolved therein. Good results are achieved with a hydroscopic liquid which consists of polar glycols, alcohols or glycerols such as triethyleneglycol or polyethyleneglycol or mixtures thereof. Watery electrolite solutions with hydroscopic qualities are also possible. In general it applies, that such a hydroscopic mixture, the hydroscopic liquid with the parts dissolved therein, must be chosen which is compatible with the membrane and module materials which are to be used.
- the invention also includes a method to regenerate a hydroscopic mixture used for regulating the humidity during the process until it has the desired water content again. That method is characterized to that end in that the mixture is then first heated or cooled to a cer ⁇ tain temperature, it is then brought into contact via a membrane which is permeable for water vapour with a gas flow with a certain humidity, until equilibrium is reached and finally the mixture is cooled again, or respectively heated again, to the working temperature.
- the membrane module which is to be used contains one or more mem ⁇ branes, which are micro-porous and hydrophobic.
- Polypropylene for example, suffices in this respect.
- they must have a suf ⁇ ficiently large exchange surface for the purpose; they may be hollo — fibre membranes, but also flat membranes can be applied. In principle it makes no difference on which side of the membrane the gas, or the liquid flow respectively, are led.
- a hol ⁇ low-fibre membrane either the liquid flow or the gas flow can flow through the fibre.
- a thin top layer consists, for example, of PDMS (silicon rubber) or polytrimethylsilylpropyne, or of thin gel layers on a polymer basis.
- this top layer for both water va ⁇ pour and for the parts which are to be removed from the gas which is to be treated must be sufficiently large in order to ensure that an effec ⁇ tive removal is achieved.
- Such a top layer may be hydrophobic or hydro- philic.
- a membrane module wit one or more membranes through which both water vapour and the, fo example, acid or alkaline gasses, which are to be removed can diffuse, and equipped with means to lead the gas flow which is to be purifie and regulated as concerns humidity across it on the one side of th membrane(s), and to lead an acid, alkaline or neutral hydroscopic mix ture across it on the other side.
- the membranes are then preferably micro-porous and hydrophobic, have a sufficiently large exchange surface and may be equipped with non-porous top layer with a sufficiently large permeability for th substances which are to diffuse through it.
- Example 1 A humid nitrogen flow with an S ⁇ 2 content of 500 ppm was lead a 20 "C with a flow rate of 4 liters per minute through the fibres of hollow-fibre membrane module (type ENKA LM2P06), polypropylene fibres, microporous).
- the membrane module has fibres with an internal diamete of 0.6 mm and a total membrane surface of 400 cm 2 .
- the fibre bundle was surrounded on the outside by 0.25 1/min. of mixture of ethylene glycol and sodium carbonate solution.
- the ratio o ethylene glycol and sodium carbonate solution in this mixture was 4:1 on a weight basis.
- For the incoming nitrogen flow a relative humidity of approximately 94% was measured, with a dew point of 18.8 °C.
- the SO2 concentration was brought to 500 ppm.
- In the outgoing nitrogen flow a relative humidity of approximately 61% was measured, with a dew point of 12.1 °C.
- a content of 0.5 ppm was measured as SO2 concentration of the outgoing nitrogen flow.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP93915837A EP0607387A1 (en) | 1992-07-08 | 1993-07-02 | Method and device for regulating the humidity of a gas flow and at the same time purifyng it of undesired acid or alkaline gasses |
JP6502960A JPH06510481A (en) | 1992-07-08 | 1993-07-02 | Method and apparatus for regulating the humidity of a gas stream and simultaneously purifying the gas stream of undesirable acidic or alkaline gases |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9201226A NL9201226A (en) | 1992-07-08 | 1992-07-08 | METHOD AND APPARATUS FOR REGULATING THE HUMIDITY OF A GAS FLOW AND PURIFYING IT AT THE SAME TIME FROM UNWANTED ACID OR BASIC GASES. |
NL9201226 | 1992-07-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994001204A1 true WO1994001204A1 (en) | 1994-01-20 |
Family
ID=19861036
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1993/001773 WO1994001204A1 (en) | 1992-07-08 | 1993-07-02 | Method and device for regulating the humidity of a gas flow and at the same time purifyng it of undesired acid or alkaline gasses |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0607387A1 (en) |
JP (1) | JPH06510481A (en) |
NL (1) | NL9201226A (en) |
WO (1) | WO1994001204A1 (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995015206A1 (en) * | 1993-12-01 | 1995-06-08 | Gas Research Institute | Organic emissions elimination process |
WO1995026225A1 (en) | 1994-03-25 | 1995-10-05 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Method for gas absorption across a membrane |
NL9400483A (en) * | 1994-03-25 | 1995-11-01 | Tno | Method for absorbing gas/liquid with the aid of hollow fibre membranes |
WO1995034371A1 (en) * | 1994-06-15 | 1995-12-21 | Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno | Method and device for the removal of ammonia from a gas |
US5490884A (en) * | 1994-09-09 | 1996-02-13 | Tastemaker | Method and system for extracting a solute from a fluid using dense gas and a porous membrane |
WO1997019196A1 (en) * | 1995-11-22 | 1997-05-29 | North Carolina State University | Bioreactor process for the continuous removal of organic compounds from a vapor phase process stream |
US5797272A (en) * | 1994-05-30 | 1998-08-25 | F F Seeley Nominees Pty Ltd | Vacuum dewatering of desiccant brines |
US6083297A (en) * | 1995-12-13 | 2000-07-04 | Whatman, Inc. | Gas dehydration membrane with low oxygen and nitrogen permeability |
WO2002038250A1 (en) * | 2000-11-08 | 2002-05-16 | Clearwater International, L.L.C. | Gas dehydration using membrane and potassium formate solution |
WO2002044624A1 (en) * | 2000-12-01 | 2002-06-06 | Daimlerchrysler Ag | Device for continuously humidifying and dehumidifying additional air from manufacturing processes and ventilating and air conditioning systems |
US6497749B2 (en) * | 2001-03-30 | 2002-12-24 | United Technologies Corporation | Dehumidification process and apparatus using collodion membrane |
US6517607B2 (en) * | 2001-06-04 | 2003-02-11 | Gas Technology Institute | Method and apparatus for selective removal of a condensable component from a process stream with latent heat recovery |
US6926829B2 (en) | 2000-03-06 | 2005-08-09 | Kvaerner Process Systems A.S. | Apparatus and method for separating fluids through a membrane |
US7625427B2 (en) | 2002-12-02 | 2009-12-01 | Molecular Products Limited | Apparatus and process for carbon dioxide absorption |
US8679230B2 (en) | 2008-12-19 | 2014-03-25 | Michael L. Strickland | Reducing emissions of VOCs from low-pressure storage tanks |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10782261B2 (en) * | 2014-03-25 | 2020-09-22 | The Procter & Gamble Company | Apparatus for sensing environmental humidity changes |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4147754A (en) * | 1975-07-28 | 1979-04-03 | General Electric Company | System for selective removal of hydrogen sulfide from a mixture of gases |
EP0308002A1 (en) * | 1987-09-09 | 1989-03-22 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Method and membrane for the removal of water vapour from a gas/vapour mixture by means of vapour permeation |
US4900448A (en) * | 1988-03-29 | 1990-02-13 | Honeywell Inc. | Membrane dehumidification |
EP0430331A1 (en) * | 1989-11-23 | 1991-06-05 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Purification of air |
WO1991015284A1 (en) * | 1990-04-03 | 1991-10-17 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Membrane separation process for dehydrating a gas or vapour or liquid mixture by pervaporation, vapour permeation or gas separation |
US5084073A (en) * | 1990-10-11 | 1992-01-28 | Union Carbide Industrial Gases Technology Corporation | Membrane drying process and system |
-
1992
- 1992-07-08 NL NL9201226A patent/NL9201226A/en not_active Application Discontinuation
-
1993
- 1993-07-02 EP EP93915837A patent/EP0607387A1/en not_active Withdrawn
- 1993-07-02 JP JP6502960A patent/JPH06510481A/en active Pending
- 1993-07-02 WO PCT/EP1993/001773 patent/WO1994001204A1/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4147754A (en) * | 1975-07-28 | 1979-04-03 | General Electric Company | System for selective removal of hydrogen sulfide from a mixture of gases |
EP0308002A1 (en) * | 1987-09-09 | 1989-03-22 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Method and membrane for the removal of water vapour from a gas/vapour mixture by means of vapour permeation |
US4900448A (en) * | 1988-03-29 | 1990-02-13 | Honeywell Inc. | Membrane dehumidification |
EP0430331A1 (en) * | 1989-11-23 | 1991-06-05 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Purification of air |
WO1991015284A1 (en) * | 1990-04-03 | 1991-10-17 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Membrane separation process for dehydrating a gas or vapour or liquid mixture by pervaporation, vapour permeation or gas separation |
US5084073A (en) * | 1990-10-11 | 1992-01-28 | Union Carbide Industrial Gases Technology Corporation | Membrane drying process and system |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995015206A1 (en) * | 1993-12-01 | 1995-06-08 | Gas Research Institute | Organic emissions elimination process |
WO1995026225A1 (en) | 1994-03-25 | 1995-10-05 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Method for gas absorption across a membrane |
NL9400483A (en) * | 1994-03-25 | 1995-11-01 | Tno | Method for absorbing gas/liquid with the aid of hollow fibre membranes |
NL9401233A (en) * | 1994-03-25 | 1995-11-01 | Tno | Membrane gas absorption method. |
US5749941A (en) * | 1994-03-25 | 1998-05-12 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Method for gas absorption across a membrane |
US5797272A (en) * | 1994-05-30 | 1998-08-25 | F F Seeley Nominees Pty Ltd | Vacuum dewatering of desiccant brines |
WO1995034371A1 (en) * | 1994-06-15 | 1995-12-21 | Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno | Method and device for the removal of ammonia from a gas |
NL9400976A (en) * | 1994-06-15 | 1996-01-02 | Tno | Method and device for removing ammonia from gas. |
US5490884A (en) * | 1994-09-09 | 1996-02-13 | Tastemaker | Method and system for extracting a solute from a fluid using dense gas and a porous membrane |
US5954858A (en) * | 1995-11-22 | 1999-09-21 | North Carolina State University | Bioreactor process for the continuous removal of organic compounds from a vapor phase process stream |
WO1997019196A1 (en) * | 1995-11-22 | 1997-05-29 | North Carolina State University | Bioreactor process for the continuous removal of organic compounds from a vapor phase process stream |
US6083297A (en) * | 1995-12-13 | 2000-07-04 | Whatman, Inc. | Gas dehydration membrane with low oxygen and nitrogen permeability |
US6926829B2 (en) | 2000-03-06 | 2005-08-09 | Kvaerner Process Systems A.S. | Apparatus and method for separating fluids through a membrane |
WO2002038250A1 (en) * | 2000-11-08 | 2002-05-16 | Clearwater International, L.L.C. | Gas dehydration using membrane and potassium formate solution |
WO2002044624A1 (en) * | 2000-12-01 | 2002-06-06 | Daimlerchrysler Ag | Device for continuously humidifying and dehumidifying additional air from manufacturing processes and ventilating and air conditioning systems |
US6887303B2 (en) | 2000-12-01 | 2005-05-03 | Daimlerchrysler Ag | Device for continuously humidifying and dehumidifying feed air |
US6497749B2 (en) * | 2001-03-30 | 2002-12-24 | United Technologies Corporation | Dehumidification process and apparatus using collodion membrane |
US6517607B2 (en) * | 2001-06-04 | 2003-02-11 | Gas Technology Institute | Method and apparatus for selective removal of a condensable component from a process stream with latent heat recovery |
US7625427B2 (en) | 2002-12-02 | 2009-12-01 | Molecular Products Limited | Apparatus and process for carbon dioxide absorption |
US8679230B2 (en) | 2008-12-19 | 2014-03-25 | Michael L. Strickland | Reducing emissions of VOCs from low-pressure storage tanks |
Also Published As
Publication number | Publication date |
---|---|
EP0607387A1 (en) | 1994-07-27 |
JPH06510481A (en) | 1994-11-24 |
NL9201226A (en) | 1994-02-01 |
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