Process for preparing 2-amylene by separating C5 distillate of petroleum

Abstract

The invention discloses a method which is used for preparing 2-pentene by separating petroleum C5 fraction and takes raffinate C5 obtained after separating diolefin and isoamylene by extracting as raw materials. The process comprises that the raw materials are distilled and separated so as to remove light components, and the materials with light components are discharged from a column top and materials richly containing 2-pentene are obtained in a column bottom; the materials in the column bottom obtained in the process 1 are extracted and distilled, and the extractant is N and N-dimethylformamide, and the feeding weight ratio of the materials and the extractant is 1:5 to 1:12, C5 saturated hydrocarbon materials are discharged from the column top, and materials richly containing 2-pentene and the extractant are obtained in the column bottom; the materials in the column bottom obtained in the process 2 are distilled so as to recycle the extractant, and a crude product of 2-pentene is obtained in the column top, the extractant is obtained in the column bottom and the extractant can be recycled to use; and the crude product of 2-pentene obtained in the process 3 is distilled and refined so as to remove heavy components, materials in the column top are taken and a refined product of 2-pentene is obtained. By processing at a much deeper degree, the method of the invention solves a technical problem that 2-pentene in C5 fraction can not be utilized by the prior art.

Description

technical field [0001] The invention relates to a method for separating petroleum C5 fractions, in particular to a method for preparing 2-pentene from petroleum C5 fractions through technical processes such as rectification and extractive distillation. Background technique [0002] The process of producing ethylene from petroleum cracking produces a considerable amount of C5 fractions, whose amount is about 10% of the ethylene production. The comprehensive utilization of C5 fractions is an effective way to improve the economic benefits of ethylene production. At present, the comprehensive utilization of C5 fractions is mainly to extract and separate C5 fractions to obtain piperylene, isoprene, dicyclopentadiene and other diolefins and isopentene with high value. The residual C5 material from which diolefins and isopentene have been extracted and separated accounts for about 10-15% of the C5 fraction raw material. The components of raffinate carbon five have very close boili...

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Problems solved by technology

[0003] The present invention provides a method for separating and producing 2-pentene from petroleum carbon five cuts, which is through deeper processing of petroleum carbon five cuts, To solve the technical problem that the existing technology cannot utilize the 2-pentene in the carbon five fraction

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