Method for Obtaining a Flow of Hydrocarbons Containing Between 4 and 12 Carbon Atoms Per Molecule, with an Increased Quantity of Linear Alpha-Olefins

摘要

A process is proposed for obtaining a stream of aliphatic hydrocarbons comprising from 4 to 12 carbon atoms per molecule, with an increased proportion of linear α-olefins compared to a feed stream of aliphatic hydrocarbons comprising from 4 to 12 carbon atoms per molecule, with a content of linear α-olefins, linear internal olefins and dienes, whereinthe feed stream is fed to a first distillation zone D1 having at least 5 theoretical plates,in which the linear α-olefins are removed partly or fully as a component of a vapor stream which additionally also comprises the dienes,and at whose lower end a liquid stream is obtained which has been depleted partly or fully of linear α-olefins,the liquid stream from the lower end of the first distillation zone D1 is introduced into a isomerization unit which is equipped with an isomerization catalyst over which the linear internal olefins are isomerized partly or fully to linear α-olefins, and the linear α-olefins formed in this way are removed as a component of a vapor stream ascending into the first distillation zone D1, the vapor stream ascending out of the first distillation zone D1 enters a selective hydrogenation unit comprising a second reactive distillation zone RD2 in which at least a portion of the dienes are hydrogenated selectively to olefins over a low-isomerization selective hydrogenation catalyst to obtain a vapor stream which is drawn off, condensed fully or partly and drawn off as a product stream with an increased proportion of linear α-olefins compared to the feed stream,the distillation zone D1 and the reactive distillation zone RD2 being integrated in a single reactive distillation column RDK.