| 摘要 |
<p>A system and process for the recovery of ethylene and propylene from a gas stream, such as a refinery offgas stream. The process comprises withdrawing, cooling, and recovering an overhead vapor stream from a single distillation column. The process includes withdrawing a liquid C3+, C4+, C5+ or C6+ bottoms product stream and recycling a portion of the bottoms steam to maintain an overhead column condenser at temperature refrigeration levels of above -140° F. and withdrawing a vapor side stream rich in propylene or ethylene-propylene.</p> |
