PROCESS FOR THE PRODUCTION OF ALKENES

摘要

1471151 Disproportionating and isomerizing alkenes SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV 28 May 1974 [30 May 1973] 25637/73 Heading C5E A process for the production of an alkene with at least 6 carbon atoms per molecule, or a mixture of such alkenes, comprises (1) catalytically disproportionating a mixture of predominantly non-terminal alkenes which mixture includes a major proportion of an alkene or alkenes having a larger nnmber of carbon atoms than the alkene(s) to be produced and, optionally, an alkene or alkenes having a smaller number of carbon atoms than said alkene or alkenes, (2) isomerizing at least part of the resulting disproportionation product, which part of said product contains an alkene or alkenes with the same number of carbon atoms as the alkene with at least 6 carbon atoms per molecule or mixture thereof to be produced, (3) catalytically disproportionating at least part of the resulting isomerization product together with at least one non-terminal alkene with a larger number of carbon atoms than the alkene with at least 6 carbon atoms per molecule or mixture thereof to be produced, said at least one non-terminal alkene being added to said isomerization product and/or being present therein as a result of being present in the disproportionation product of stage (1), and (4) removing the desired alkene or alkene mixture from the product of stage (3). The feedstock may be obtained by oligomerization of ethylene followed by double bond isomerization. The disproportionation catalyst may be an oxide of Mo and of Co supported on alumina. The isomerization catalyst may be a basic salt of potassium supported on active alumina.