METHOD AND SYSTEM FOR OLIGOMERISING OLEFINS BY MEMBRANE SEPARATION

摘要

The invention relates to a method for oligomerising olefins containing from 2 to 6 carbon atoms comprising at least a) one reaction step for recovering a first flow containing oligomers, paraffins and unreacted olefins, b) a separation step for separating a part of oligomers contained in the flow of a mixture comprising oligomers, paraffins and unreacted olefins, c) a step for recycling the portion of said mixture at the reaction step, d) a membrane separation step for separating the other portion of the mixture in such a way that a permeate comprising at least 70 % by weight olefins and a retantate comprising paraffins and oligomers are withdrawn and e) a step for recovering oligomers on the retantate.