Separation method of propylene oxidation products epoxypropane, acrolein and acetone

Abstract

The invention relates to a separation method of propylene oxidation products epoxypropane, acrolein and acetone, and belongs to the technical field of propylene oxidation product separation. Materialsto be separated enter an epoxypropane separation tower from the middle section of a tower section for rectification separation, epoxypropane is extracted from the top of the tower, and acrolein and acetone extracted from the bottom of the tower enter an extractive distillation tower; a mixture of the to-be-separated materials acrolein and acetone and an extraction agent are divided into two pathsto enter the extractive distillation tower for extractive distillation separation, and acetone is extracted from the top of the tower; the acrolein and the extraction agent distilled from the tower kettle enter a solvent recovery tower to be subjected to rectification separation, the acrolein is extracted from the tower top, and the extraction agent is extracted from the tower kettle; and the extraction agent is recycled back to the extractive distillation tower for use. The method is scientific and reasonable in design, high-purity and high-recovery-rate separation of the materials is achieved, more economical separation is achieved on the basis of comprehensively considering process cost such as energy consumption and material consumption, and the method has a large application prospectin industry.

Description

technical field [0001] The invention relates to a method for separating propylene oxide products, acrolein and acetone, belonging to the technical field of separation of propylene oxidation products. Background technique [0002] As a bulk industrial process, propylene oxidation has important uses, and the main products include propylene oxide, acrolein, acetone, etc. The structures of the three are similar, especially acrolein and acetone have similar boiling points and polarities. Although they do not form azeotropes, but because the relative volatility is very small, if ordinary rectification is used to separate the two, it is desirable to obtain higher quality The required number of theoretical boards and the reflow ratio of the products are very large, which is not economically feasible. [0003] Chinese patent CN201810852178.7 discloses a separation method and determination method of acrolein and acetone, which are volatiles in automotive interior parts. The detection...

AI Technical Summary

Problems solved by technology

The structures of the three are similar, especially acrolein and acetone have similar boiling points and polarities. Although they do not form azeotropes, but because the relative volatility is very small, if ordinary rectification is used to separate the two, it is desirable to obtain higher quality For the products, the required number of theoretical boards and the reflow ratio are very large, which is economically unfeasible

[0003] Chinese patent CN201810852178.7 discloses a separation method and determination method of acrolein and acetone, which are volatiles in automotive interior parts. A liquid chromatography column is used for the detection of the two, but the chromatography method is difficult to apply on an industrial scale

[0004] For the separation process of a single material, U.S.9,115,067 proposes a method for producing acrolein, which adopts a conventional rectification process with side stream extraction to purify acrolein, but because water is used in the process to quench the reaction gas phase output, and Acrolein and water are azeotropic, so only acrolein with a purity of 93.45% can be obtained at the side line near the top of the tower, which is difficult to meet the application requirements

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