Patent ID: 7528201

Claim:
A process for making an olefin product from an oxygenate feedstock comprising: (1) contacting an oxygenate feedstock comprising methanol, dimethyl ether, or a mixture thereof with a silicoaluminophosphate molecular sieve catalyst comprising a CHA framework type material, an AEI framework type material, or a material comprising at least one intergrown phase of an AEI framework type and a CHA framework type, and made by a method comprising: (a) preparing a synthesis mixture comprising water, an organic directing agent, and sources of phosphorus, alumina and silica, wherein the total amount of alkali metal present in said synthesis mixture is from about 0.08 to about 0.90 g/mole alumina; (b) heating said synthesis mixture to a crystallization temperature of between about 100° C. and about 300° C.; and (c) recovering said molecular sieve, wherein the contacting of the feedstock and the catalyst forms an olefin product comprising ethylene and propylene; and (2) converting at least part of the olefin product to polymer.