Reducing temperature differences within the regenerator of an oxygenate to ...

(54) REDUCING TEMPERATURE DIFFERENCES WITHIN THE REGENERATOR OF AN OXYGENATE TO OLEFIN PROCESS

(76) Inventors: Teng Xu, Houston, TX (US); Paul N.

Chisholm, Houston, TX (US); Stephen
Neil Vaughn, Kingwood, TX (US);
Shun Chong Fung, Bridgewater, NJ
(US); Keith Holroyd Kuechler,
Friendswood, TX (US); James R.
Lattner, Seabrook, TX (US); Kenneth
Ray Clem, Humble, TX (US); Patrick
J. Maher, Kingwood, TX (US); Dean
C. Draemel, Kingwood, TX (US)

Correspondence Address:

EXXONMOBIL CHEMICAL COMPANY

P O BOX 2149

BAYTOWN, TX 77522-2149 (US)

(21) Appl. No.: 10/170,939

(22) Filed: Jun. 13, 2002

Related U.S. Application Data

(60) Provisional application No. 60/345,402, filed on Jan. 7, 2002.

Publication Classification

(52) U.S. CI 585/638; 585/640; 585/639

(57) ABSTRACT

The present invention provides a process for making an olefin product from an oxygenate feedstock which comprises:

a) contacting the feedstock in a reaction zone with a catalyst comprising i) a molecular sieve having defined pore openings and ii) a CO oxidation metal, under conditions effective to convert the feedstock into an olefin product stream comprising C2-C3 olefins and to form carbonaceous deposits on the catalyst so as to provide a carbon-containing catalyst;

b) contacting at least a portion of the carbon-containing catalyst with a regeneration medium comprising oxygen in a regeneration zone comprising a fluid bed regenerator having a dense fluid phase and a dilute fluid phase under conditions effective to obtain a regenerated catalyst portion, wherein the difference between the temperature of the dilute phase and the temperature of the dense phase is no greater than 100° C;

c) introducing said regenerated catalyst portion into said reaction zone; and

(51) Int. CI.7