Patent ID: 7622417

Claim:
A process for making an olefin product from an oxygenate feedstock comprising: (1) synthesizing an aluminophosphate or metalloaluminophosphate molecular sieve comprising an AEI structure type material by (a) preparing a mixture comprising a source of water, a source of aluminum, a source of phosphorus, and at least one directing agent, wherein the ratio of H 2 O:Al 2 O 3 is less than 30, (b) heating said mixture to a crystallization temperature within a range of from about 150° C. to about 200° C., wherein at least part of said heating is conducted so as to raise the temperature of said mixture at a rate of 6.0° C. per hour or less, said temperature raising extending for at least one hour, (c) maintaining said mixture within the crystallization temperature range for a time from about 5 hours to about 100 hours, wherein said mixture is agitated during steps (b) and (c), and (d) recovering said molecular sieve at a yield of at least 18 wt %; and (2) contacting said oxygenate feedstock with a catalyst comprising said molecular sieve to produce an olefin product.