[EN] PRODUCTION OF PROPYLENE VIA SIMULTANEOUS DEHYDRATION AND SKELETAL ISOMERISATION OF ISOBUTANOL ON ACID CATALYSTS FOLLOWED BY METATHESIS<br/>[FR] PRODUCTION DE PROPYLÈNE PAR DÉSHYDRATATION ET ISOMÉRISATION DE SQUELETTE SIMULTANÉES DE L'ISOBUTANOL SUR DES CATALYSEURS ACIDES SUIVIES PAR UNE MÉTATHÈSE
申请人:TOTAL PETROCHEMICALS RES FELUY
公开号:WO2011113836A1
公开(公告)日:2011-09-22
The present invention relates to a process for the production of propylene in which in a first step isobutanol is subjected to a simultaneous dehydration and skeletal isomerisation to make substantially corresponding olefins, having the same number of carbons and consisting essentially of a mixture of n-butenes and iso-butene and in a second step n-butenes are subjected to methathesis, said process comprising : a) introducing in a reactor a stream (A) comprising isobutanol, optionally water, optionally an inert component, b) contacting said stream with a catalyst in said reactor at conditions effective to dehydrate and skeletal isomerise at least a portion of the isobutanol to make a mixture of n-butenes and iso-butene, c) recovering from said reactor a stream (B), removing water, the inert component if any and unconverted isobutanol if any to get a mixture of n-butenes and iso-butene, d) fractionating said mixture to produce a n-butenes stream (N) and to remove the essential part of isobutene optionally recycled with stream (A) to the dehydration/isomerization reactor of step b), e) sending the stream (N) to a methathesis reactor and contacting stream (N) with a catalyst in said methathesis reactor, optionally in the presence of ethylene, at conditions effective to produce propylene, f) recovering from said methathesis reactor a stream (P) comprising essentialy propylene, unreacted n-butenes, heavies, optionally unreacted ethylene, g) fractionating stream (P) to recover propylene and optionally recycling unreacted n-butenes and unreacted ethylene to the methathesis reactor.
本发明涉及一种生产丙烯的工艺,其中在第一步中,异丁醇经过同时脱水和骨架异构化以制备基本相应的烯烃,具有相同数量的碳,并且主要由正丁烯和异丁烯的混合物组成,在第二步中,正丁烯经过甲醇异构化,所述工艺包括:a)在反应器中引入包括异丁醇、可选的水、可选的惰性成分的流(A),b)在所述反应器中将所述流与催化剂接触,在有效条件下使至少部分异丁醇脱水和骨架异构化,以得到正丁烯和异丁烯的混合物,c)从所述反应器中回收流(B),去除水、如有的惰性成分和如有的未转化的异丁醇,以获得正丁烯和异丁烯的混合物,d)分馏所述混合物以产生正丁烯流(N)并去除大部分异丁烯,可选择地与流(A)回收到步骤b)的脱水/异构化反应器中,e)将流(N)送入甲醇异构化反应器并在所述甲醇异构化反应器中与催化剂接触,可选择地在乙烯的存在下,在有效条件下产生丙烯,f)从所述甲醇异构化反应器中回收包含基本上丙烯的流(P),未反应的正丁烯、重质物、可选择地未反应的乙烯,g)分馏流(P)以回收丙烯,并可选择地将未反应的正丁烯和未反应的乙烯回收到甲醇异构化反应器中。