A kind of method that 2-pentene isomerization is 1-pentene

Abstract

A method for isomerizing 2-pentene into 1-pentene, mainly comprising the following steps: 1) Carrying out precise rectification to the raffinate C5 raw material, discharging a mixture of 1-pentene and isopentane from the top of the tower, and Obtain the mixed fraction containing 2-pentene and normal pentane; 2) Step 1) the tower bottom material containing 2-pentene and normal pentane that is obtained enters the second rectification tower, and the top of the tower steams out normal pentane, and the tower bottom obtains Enriched 2-pentene; 3) The tower bottom material containing 2-pentene obtained in step 2) passes through a fixed-bed reactor, and 2-pentene is isomerized into 1-pentene; 4) Step 3) obtained The isomerization reaction solution is returned to step 1) to separate 1-pentene in the reaction solution. The positive effect of the present invention is very obvious. The crystalline aluminosilicate is used as the isomerization catalyst, which has good activity and anti-coking performance, and improves the service life of the catalyst. At the same time, the method of returning the material at the outlet of the isomerization reactor to the rectification of the raw material simplifies The process improves the process economy.

Description

technical field [0001] The invention relates to a method for isomerizing 2-pentene into 1-pentene by using 2-pentene in the C5 fraction as a raw material, aluminosilicate crystal molecular sieve as a catalyst, and a fixed-bed continuous reaction process . Background technique [0002] The by-product of oil cracking to ethylene production is a considerable amount of C5 fractions, which account for 10% of the ethylene production. The comprehensive utilization of C5 fractions is an important way to improve the economic benefits of ethylene. At present, the comprehensive utilization of C5 fractions is mainly the separation of C5 fractions to obtain chemical intermediates of isoprene, dicyclopentadiene, piperylene diolefins and isopentene, which are widely used in the fields of polymers and fine chemicals . The residual C5 material from diolefins and isopentene after extraction and separation accounts for about 10% to 15% of the C5 fraction raw material. The five components of...

AI Technical Summary

Problems solved by technology

[0003] It can be seen that in the prior art, there are certain defects in the process of isomerizing 2-pentene into 1-pentene, that is, the catalyst reaction activity period is short and does not possess economical efficiency.

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