Patent ID: 7288689

Claim:
A process for producing light olefins, the process comprising the steps of: (a) contacting a first syngas stream comprising carbon monoxide, carbon dioxide and hydrogen with a methanol synthesis catalyst under first conditions effective to form a methanol-containing stream comprising methanol and water; (b) contacting a second syngas stream comprising carbon monoxide, carbon dioxide and hydrogen with a fuel alcohol synthesis catalyst under second conditions effective to form a fuel alcohol-containing stream comprising ethanol, propanol and butanol; (c) combining at least a portion of the methanol-containing stream with at least a portion of the fuel alcohol-containing stream to form a combined stream having a methanol to C 2 -C 4 alcohol weight ratio of from about 0.1 to about 4.0 and having a butanol content of less than 3 weight percent; and (d) contacting at least a portion of the combined stream with a molecular sieve catalyst composition in a reaction zone under third conditions effective to form ethylene and propylene.