Claims
- 1. A method of making an olefin product from an oxygenate-containing feedstock, comprisingproviding a silicoaluminophosphate molecular sieve having decreased catalytic activity as a result of contact with moisture; and contacting the molecular sieve with anhydrous liquid or vapor until the molecular sieve has a methanol uptake ratio that is increased by at least 10% compared to the provided molecular sieve, thereby forming a rejuvenated molecular sieve; and contacting the rejuvenated molecular sieve with an oxygenate-containing feedstock to produce an olefin product.
- 2. The method of claim 1, wherein the methanol uptake ratio is increased by at least 50%.
- 3. The method of claim 2, wherein the methanol uptake ratio is increased by at least 100%.
- 4. The method of claim 3, wherein the methanol uptake ratio is increased by at least 500%.
- 5. The method of claim 1, wherein the anhydrous liquid or vapor contains less than 30 wt. % water.
- 6. The method of claim 5, wherein the anhydrous liquid or vapor contains less than 20 wt. % water.
- 7. The method of claim 6, wherein the anhydrous liquid or vapor contains less than 10 wt. % water.
- 8. The method of claim 1, wherein the anhydrous liquid or vapor has a kinetic diameter of not greater than 1.5 times the average pore size of the molecular sieve.
- 9. The method of claim 8, wherein the anhydrous liquid or vapor has a kinetic diameter of not greater than 1.3 times the average pore size of the molecular sieve.
- 10. The method of claim 1, wherein in the anhydrous liquid or vapor is an alcohol, ether, ketone, carboxylic acid, aldehyde, nitrogen containing organic base, or a mixture thereof.
- 11. The method of claim 1, wherein the anhydrous liquid or vapor is selected from the group consisting of methanol, ethenol dimethyl ether, acetone, propylaniine, and acetonitrile.
- 12. The method of claim 11, wherein the anhydrous liquid or vapor is methanol.
- 13. The method of claim 1, wherein the silicoaluminophosphate molecular sieve is selected from the group consisting of SAPO-5, SAPO-8, SAPO-11, SAPO-16, SAPO-17, SAPO-18, SAPO-20, SAPO-31, SAPO-34, SAPO-35, SAPO-36, SAPO-37, SAPO-40, SAPO-41, SAPO-42, SAPO-44, SAPO-47, SAPO-56, the metal containing forms thereof, and mixtures thereof.
- 14. The method of claim 13, wherein the silicoaluminophosphate molecular sieve is selected from the group consisting of SAPO-18, SAPO-34, SAPO-35, SAPO-44, SAPO-47, the metal containing forms thereof, and mixtures thereof.
- 15. The method of claim 14, wherein the silicoaluminophosphate molecular sieve is selected from the group consisting of SAPO-18, SAPO-34, the metal containing forms thereof, and mixtures thereof.
- 16. The method of claim 1, wherein the oxygenate-containing feedstock is selected from the group consisting of methanol; ethanol; n-propanol; isopropanol; C4-C20 alcohols; methyl ethyl ether; dimethyl ether; diethyl ether; di-isopropyl ether; formaldehyde; dimethyl carbonate; dimethyl ketone; acetic acid; and mixtures thereof.
- 17. The method of claim 16, wherein the oxygenate-containing feedstock is selected from the group consisting of methanol, dimethyl ether, and mixtures thereof.
- 18. The method of claim 1, wherein the rejuvenated molecular sieve is contacted with the oxygenate-containing feedstock at a temperature of 200° C. to 700° C.
- 19. The method of claim 1, wherein the rejuvenated molecular sieve is contacted with the oxygenate-containing feedstock at a WHSV of at least 20 hr−1.
- 20. The method of claim 1, wherein the silicoaluminophosphate molecular sieve is provided with a binder material.
- 21. The method of claim 20, wherein the olefin product is contacted with a polyolefin-forming catalyst under conditions effective to form a polyolefin.
- 22. The method of claim 1, wherein the anhydrous liquid or vapor has a gas-phase proton affinity greater than or equal to the proton affinity of water.
Parent Case Info
This is a division of application Ser. No. 09/615,526, filed Jul. 13, 2000, now U.S. Pat. No. 6,448,197, and is a division of application Ser. No. 09/558,774, filed Apr. 26, 2000, now U.S. Pat. No. 6,498,120.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO 9310065 |
May 1993 |
WO |