Recovery process and separation device of toluene solvent in production process of alpha-acetyl-gamma butyrolactone

Abstract

The invention relates to a recovery process and a separation device of a toluene solvent in the production process of alpha-acetyl-gamma butyrolactone. The recovery process comprises the following steps of: feeding from the upper part and lower part of a toluene extraction rectifying tower, so as to obtain a mixture of ethyl acetate, ethanol and a little toluene at the tower top and a mixture of toluene and ketone extracting agent, feeding the mixture in the tower kettle into a ketone extracting agent recovery tower for reduced pressure distillation so as to obtain toluene separated from the tower top and a toluene extraction agent separated from the tower kettle and returning the toluene extraction agent to a feed inlet on the upper part of a toluene extraction rectifying tower; feeding the material on the top of the toluene extraction rectifying tower into a toluene secondary extraction rectifying tower, recycling a ketone extraction agent and a little toluene in the tower kettle to the toluene extraction rectifying tower so as to obtain the qualified ethyl acetate at the tower top and a mixture of alcohol extraction agent and ethanol in the tower kettle, and feeding the mixture in the tower kettle into an alcohol extracting agent recovery tower for reduced pressure distillation so as to obtain ethanol separated from the tower top, and an alcohol extracting agent separated from the tower kettle. By adopting the extractive distillation technology and the separation device, the continuous production is achieved, and the toluene generated in the production process of alpha-acetyl-gamma butyrolactone is recovered.

Description

technical field

[0001] The present invention relates to a kind of separation process of organic mixture and its equipment, specifically, relates to a kind of extraction agent (ketones, alcohols) from the solvent toluene mixture raw material in the production process of α-acetyl-γ-butyrolactone Extractive distillation, rectification under reduced pressure to recover toluene, separation of ethyl acetate, ethanol, etc. in the mixture, and the equipment used for this process. Background technique

[0002] α-acetyl-γ-butyrolactone is referred to as γ-acetylbutyrolactone, also known as 2-acetylbutyrolactone (2-Acetylbutyrolactone), abbreviated as ABL, is an important raw material and intermediate in the field of medicine and organic chemical industry , there are two main synthesis methods, namely: (1) using γ-butyrolactone and ethyl acetate as raw materials, and (2) using ethyl acetoacetate and ethylene oxide as raw materials. Since ethylene oxide is a first-class flammable and e...

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