METHOD FOR INCREASING LIGHT OLEFIN YIELD BY CONVERSION OF A HEAVY HYDROCARBON FRACTION OF A PRODUCT TO LIGHT OLEFINS

摘要

contacting an oxygenate feed in a first reactor with a non-zeolitic molecular sieve catalyst under first conditions effective to produce a first product comprising light olefins and a heavy hydrocarbon fraction; separating said light olefins itom said heavy hydrocarbon fraction; feeding said heavy hydrocarbon fraction to a second reactor; and subjecting said heavy hydrocarbon fraction in said second reactor to second conditions effective to convert at least a portion of said heavy hydrocarbons to light olefins.