METHOD FOR PRODUCING A STREAM OF HYDROCARBONS CONTAINING FROM 5 TO 12 CARBON ATOMS PER MOLECULE AND HAVING AN INCREASED CONTENT IN LINEAR a-OLEFINS

摘要

The invention relates to a method for producing a flow of aliphatic hydrocarbons which comprise from 5 to 12 carbon atoms per molecule and whose content in linear a- olefins is increased with respect to a feeding flow of aliphatic hydrocarbons comprising from 5 to 12 carbon atoms per molecule and containing linear a- olefins, internal linear olefins and dienes. The inventive method consists in bringing the feeding flow to a first distillation area D1 comprising at least 5 theoretical separation stages, wherein linear a-olefins are partially or totally separated in the form of a steam flux component which also contains dienes and on whose lower end a fluid flow partially or totally depleted of the linear a-olefins is obtainable, in introducing said fluid flow from the lower end of the first distillation area D1 into an isomerisation unit which is provided with an isomerisation catalyst in which the internal linear olefins are partially or totally isomerised into linear a- olefins and the thus formed linear a- olefins are separated in the form of the steam flux component mounting to the first distillation area D1 and entering a selective hydrogenation unit in which at least one part of dienes are selectively hydrogenated into olefins in a low-isomerisation selective hydrogenation catalyst and the thus obtainable steam flux is extracted, totally or partially condensed and removed in the form of a product flow whose content in linear a- olefins is increased with respect to the feeding stream.