Patent ID: 7525007
Filing Date: 2009-04-28
Classification: C07C,C10G,Y02P

Abstract:
1. A method of producing propylene from ethane comprising the steps of: a. steam cracking an ethane or primarily ethane feedstock thereby producing a cracking product containing ethylene, hydrogen, ethane, methane, acetylene and C b. treating said cracking product in an ethylene plant recovery section including removing said hydrogen, methane and C c. recycling said bottoms ethane fraction to said steam cracking; d. reacting by dimerization in a dimerization section a first portion of said chemical grade ethylene fraction thereby producing a butene-rich stream; e. reacting by metathesis in a metathesis section the butene in said butene-rich stream with a second portion of said chemical grade ethylene fraction thereby producing a propylene-rich stream containing propylene, ethylene and ethane; f. separating propylene from said ethylene and ethane in said propylene-rich stream, and g. recycling at least a first portion of said ethylene and ethane from said propylene-rich stream to said C