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US 7,598,197 B2Granted
Catalyst cooling processes utilizing steam superheating
AssigneeExxonMobil Chemical Patents Inc.
InventorsJames R. Lattner, Christopher L. Becker, James H. Beech, Jr.
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Abstract
This invention provides processes, systems and devices for cooling catalyst, preferably regenerated catalyst, by superheating steam and boiling water. The inventive process advantageously provides ideal cooling conditions while ensuring minimal hydrothermal deactivation of the catalyst during the cooling process. The invention is particularly well-suited for cooling catalyst in an oxygenate to olefins reaction system.
Claims20
A process for regenerating catalyst, wherein the process comprises the steps of:
- (a) regenerating an at least partially coked catalyst particle to form a regenerated catalyst particle having a temperature greater than about 593° C.;
- and
- (b) cooling the regenerated catalyst particle by at least about 38° C. through superheating steam and boiling water, but to a temperature of no less than 316° C., at a regeneration pressure of less than about 10,343 kPag, to form a cold catalyst;
- wherein the cooling occurs in one or more heat exchangers comprising a first cooling surface and a second cooling surface, the first cooling surface having a first surface area dedicated to superheating steam and the second cooling surface having a second surface area dedicated to boiling water, and wherein the ratio of the first surface area to the second surface area can be adjusted.
1 more element
Dependencies are inferred from the claim text.