| US 7,550,641 B2 | ||
| Methods for recovering activity of molecular sieve catalysts | ||
| John Q. Chen, Glenview, Ill. (US) | ||
| Assigned to UOP LLC, Des Plaines, Ill. (US) | ||
| Filed on May 20, 2008, as Appl. No. 12/123,545. | ||
| Application 12/123545 is a division of application No. 11/171886, filed on Jun. 30, 2005. | ||
| Prior Publication US 2008/0227934 A1, Sep. 18, 2008 | ||
| Int. Cl. B01J 38/06 (2006.01); B01J 38/48 (2006.01); B01J 38/66 (2006.01); C07C 1/00 (2006.01) | ||
| U.S. Cl. 585—640 [502/20; 502/22; 502/26; 502/34; 502/27; 502/54; 502/55] | 16 Claims |
| 1. A method of making an olefin product from an oxygenate-containing feedstock, comprising:
providing a silicoaluminophosphate molecular sieve having decreased catalytic activity as a result of contact with high temperature
moisture at between 300° and 600° C. or regeneration temperatures between 350° and 700° C.;
contacting the molecular sieve with low temperature liquid comprising at least 50% water or water vapor wherein said low temperature
is between about 15° and 200° C. until the catalytic activity of said molecular sieve increases at least 25% as compared to
the molecular sieve having decreased catalytic activity; and
then contacting the rejuvenated molecular sieve with an oxygenate-containing feedstock to produce an olefin product.
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