Method for separating sec-butyl acetate from reaction mixture of acetic acid and hybrid C4

Abstract

The invention discloses a separating method of butyl para-acetate from the reacted compound of acetic acid and C4, which comprises the following steps: flashing to remove non-reacted C4 and light component; flowing production from the bottom of flashing tower into coboiling rectifying tower; adding coboiler A to separate butyl para-acetate and acetic acid; transmitting mass from coboiler into acid condensing tower; adding coboiler B to coboil and rectify again; condensing acetic acid; obtaining the product with purity over 99% and acetic acid content less than 0.01% and water less than 0.05%; recycling acetic acid.

Description

technical field [0001] The invention relates to a method for separating sec-butyl acetate from the mixture after the reaction of acetic acid and mixed C4. Background technique [0002] Compared with the traditional technology, using 1-butene and 2-butene as raw materials and reacting with acetic acid to prepare sec-butyl acetate has the advantages of wide source of raw materials and low price, good economic benefits, and environmental friendliness. Therefore, its synthetic process The research has received widespread attention. [0003] However, there are few reports on the separation and purification process of preparing sec-butyl acetate by reacting acetic acid with 1-butene and 2-butene. [0004] US5457228 reports a method for synthesizing sec-butyl acetate by reacting acetic acid with 1-butene and 2-butene, and the obtained olefin conversion rate and product selectivity are high. For its separation method, it is mentioned in the patent that sec-butyl acetate can be sep...

AI Technical Summary

Problems solved by technology

[0005] However, the boiling points of sec-butyl acetate and acetic acid are very close, so it is difficult to fully separate sec-butyl acetate and acetic acid by simple distillation.