Method for separating straight-chain olefins from alkyl alkene containing material flow

Abstract

The invention provides a method for separating straight-chain olefins from alkyl alkene containing material flows. The method comprises the steps that coal based fischer-tropsch synthetic oil is usedas raw materials; the range of the target olefin carbon number is 4 to 18; the raw materials are subjected to the steps of deacidification, fraction cutting, oxygenated chemical removal, alkyl alkeneseparation, isomer separation and absorption drying treatment; a polymer grade straight-chain olefin product is obtained. Compared with the traditional rectification and extraction process, the methodhas the advantages that the product purity is high; the yield is high; the energy consumption is low; the production cost is obviously reduced.

Description

technical field [0001] The invention relates to a method for separating linear olefins from a stream containing alkanes, in particular to a method for separating linear olefins by means of a simulated moving bed. Background technique [0002] Fischer-Tropsch synthetic oil products contain a large amount of valuable chemical raw materials - olefins, which are key raw materials for the production of other fine chemical products and have an extremely significant impact on their downstream industries. [0003] At present, domestic and foreign follow-up processing methods for Fischer-Tropsch synthetic oil products mainly focus on distillation and rectification. [0004] Patents US7217852 and US7294253 proposed a distillation method of Fischer-Tropsch synthetic oil and the middle distillate obtained by distillation. The middle distillate contains methyl, ethyl, propyl and other branched chains, and C9~C16 components account for the total More than 90% of the distillate oil, the m...

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Problems solved by technology

However, the route of this process is relatively complicated, and the operation energy consumption is high, resulting in very high investment and operating costs, and this technology can only separate C6 and C8 components, and cannot separate components with high carbon numbers.

[0009] The separation process in the above technical documents all adopts the traditional extractive distillation process. Since the difference between the boiling points of α-olefins and impurities (isomeric olefins) is extremely small, the cost of separation by extractive distillation process is very high, the amount of solvent used is large and the recovery is difficult. Does not meet the needs of current social development

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