The method for preparing high-purity 1-pentene

Abstract

The method for producing high-purity 1-pentene, the process includes: using the raffinate carbon five after extraction and separation of diolefins and isopentene as raw material to rectify and separate and remove heavy components, and enrich 1-pentene at the top of the tower Distillate, the heavy component is discharged from the tower bottom; the fraction enriched in 1-pentene obtained from the process 1) at the top of the tower is subjected to precise rectification to remove light components, and carbon penta-alkanes and other light components are obtained at the top of the tower, and obtained at the bottom of the tower The crude product of 1-pentene; the crude product of 1-pentene obtained by process 2) isomerized through a fixed-bed catalytic bed of sulfonic acid-based cation exchange resin, so that the difficult-to-separate 2-methyl-1-in the crude product Butene is converted into 2-methyl-2-butene which is easier to separate; the isomerization product obtained in process 3) is sent to a refining tower for purification to obtain more than 98% 1-pentene. The invention improves the process flow, simplifies the process, reduces the production cost, and improves the economic efficiency of the process for preparing high-purity 1-pentene.

Description

technical field [0001] The invention relates to a method for separating petroleum C5 fractions, in particular to a method for preparing high-purity 1-pentene by separating petroleum C5 fractions through processes such as precision rectification and isomerization. Background technique [0002] The process of producing ethylene from petroleum cracking produces a considerable amount of carbon five fractions, which account for about 10% of the ethylene production. At present, the comprehensive utilization of the C5 fraction is mainly to extract and separate the C5 fraction to obtain more valuable diolefins such as isoprene, dicyclopentadiene and piperylene, and isopentene. The residual C5 material from diolefins and isopentene after extraction and separation accounts for about 10% to 15% of the C5 fraction raw material. Because the boiling points of the five components of raffinate carbon are very close, it is difficult to separate them, so they are generally only used as fuel ...

AI Technical Summary

Problems solved by technology

Due to the complexity of the whole process, more equipment, and the use of extractive distillation, the energy consumption of the process is relatively high.

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