Production of propylene employing dimerising ethylene to 1-butene, hydroisomerization to 2-butene and metathesis by ethylene

摘要

A process for producing high purity propylene comprises:a step for dimerizing ethylene to 1-butene;a step for hydroisomerizing 1-butene to 2-butenes; anda step for metathesis of 2-butenes by ethylene. Advantageously, the ethylene used to produce the 1-butene and ethylene for metathesis derive from a steam cracking unit. To increase propylene production, the process can use a steam cracking or FCC C4cut as an additional butene source.