Patent ID: 8080698

Claim:
A process for making propylene, comprising: dehydrogenating a feed comprising butane to provide a first product comprising butene; bypassing the first product around an etherification reactor for converting isobutylene to methyl tert-butyl ether; cracking at least a portion of the first product in a first cracker to provide a second product comprising propylene, ethylene, and butane; cracking a refinery hydrocarbon comprising gas oil, full range gas oil, resid, or a combination thereof in a second cracker to provide a cracked hydrocarbon comprising ethylene, propylene, or a combination thereof; cracking one or more alkanes in a third cracker to provide an effluent comprising ethylene and propylene; combining the second product, cracked hydrocarbon, and effluent to form a mixture; selectively separating at least a portion of the mixture to provide a third product comprising propylene and a first recycle comprising butane; and recycling at least a portion of first recycle to the first product.