Inhibiting catalyst coke formation in the manufacture of an olefin
AssigneeExxonMobil Chemical Patents Inc.
InventorsBryce A. Williams, Stephen N. Vaughn
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for inhibiting catalyst coke formation in the manufacture of an olefin. In particular, the method inhibits coke formation on a silicoaluminophosphate molecular sieve catalyst in the manufacture of ethylene and/or propylene. The method includes contacting an oxygenate-containing feedstock with a silicoaluminophosphate molecular sieve catalyst to form the olefin-containing product, and separating the olefin-containing product from the catalyst. An unregenerated portion of the separated catalyst is cooled before contacting with additional oxygenate feedstock to reduce coke formation on the catalyst.
Claims48
A method of inhibiting catalyst coke formation in the manufacture of an olefin-containing product, comprising:
- contacting an oxygenate-containing feedstock with a silicoaluminophosphate molecular sieve catalyst at an average reactor temperature effective to form the olefin-containing product;
- separating the olefin-containing product from the catalyst;
- cooling at least a portion of the separated catalyst below the average reactor temperature;
- and
- contacting the cooled portion of the catalyst with additional oxygenate-containing feedstock at a gas superficial velocity of at least 1.0 meters per second, wherein the cooled portion of the catalyst has not been regenerated prior to contact with the additional oxygenate-containing feedstock.
A method of inhibiting catalyst coke formation in the manufacture of an olefin-containing product, comprising:
- contacting an oxygenate-containing feedstock with a silicoaluminophosphate molecular sieve catalyst at an average reactor temperature of from 350 to 550° C. to form the olefin-containing product;
- separating the olefin-containing product from the catalyst;
- regenerating a first portion of the separated catalyst;
- cooling a second portion of the separated catalyst below the average reactor temperature;
- combining the regenerated and cooled catalyst portions;
- and
- contacting the combined catalyst portions with additional oxygenate containing feedstock.
A method of inhibiting catalyst coke formation in the manufacture of an olefin-containing product, comprising:
- contacting an oxygenate-containing feedstock with a silicoaluminophosphate molecular sieve catalyst at an average reactor temperature of from 350° C. to 550° C.;
- separating the olefin-containing product from the catalyst;
- cooling at least a portion of the separated catalyst to a temperature of from 300° C. to 325° C., and below the average reactor temperature;
- and
- contacting the cooled portion of the catalyst with additional oxygenate-containing, wherein the cooled portion of the catalyst has not been regenerated prior to contact with the additional oxygenate-containing feedstock.
Dependencies are inferred from the claim text.