Patent ID: 8058497

Claim:
A process for converting an oxygenate feed to a light olefin product comprising: a) providing the oxygenate feed comprising a majority of methanol and from about 8 wt % to about 30 wt % of one or more C 2 -C 4 alcohols; b) providing a catalyst composition consisting of a SAPO catalyst and a basic Group 3 metal oxide co-catalyst at a SAPO catalyst to basic Group 3 metal oxide co-catalyst ratio from about 10:1 to about 2:1, wherein the SAPO catalyst comprises a CHA framework type, an AEI framework type, or both, and wherein the basic metal oxide co-catalyst absorbs more than 0.03 mg of CO 2 per square meter of co-catalyst surface area at about 100Â° C.; and c) contacting the oxygenate feed with the catalyst composition at a temperature from about 450Â° C. to about 580Â° C. and other under conditions sufficient to convert at least a portion of the oxygenate feed to a light olefin product, wherein the catalyst composition has an on-stream catalyst lifetime of at least 60 g methanol converted per gram of sieve; wherein the olefin product has (i) a prime olefin ratio of at least 1.0:1, (ii) a prime olefin selectivity of at least 75.5%, or (iii) both (i) and (ii).