Adipic acid waste water evaporation and concentration process and device thereof

Abstract

The invention relates to an adipic acid waste water evaporation and concentration process. The adipic acid waste water evaporation and concentration process comprises the following steps that firstly, a material is preheated; secondly, preheated material enters a film falling heat exchanger to be heated, and gas-liquid mixture is formed; thirdly, the gas-liquid mixture enters the film falling heat exchanger to be subjected to gas-liquid separation, and a concentrated solution returns to the film falling heat exchanger; fourthly, after the concentration ratio of the material in the film falling heat exchanger reaches a preset value, the material is transferred out, heated and concentrated by a forced circulation heat exchanger and then fed into the gas-liquid separator to be subjected to further gas-liquid separation; fifthly, the material is further concentrated in the gas-liquid separator, when the concentration ratio meets the requirement, the material is discharged, secondary steam enters a compressor to be compressed, and after the temperature is raised, the material continues to be heated. The concentration of adipic acid in the adipic acid waste water is effectively increased, the energy consumption is saved, and the concentration cost is reduced; after the concentration of the adipic acid solution is improved, oxalic acid crystals are separated out conveniently, and the environment pollution is reduced.

Description

technical field [0001] The invention relates to a process for evaporating and concentrating adipic acid waste water and a device thereof. Background technique [0002] Adipic acid, also known as fatty acid, is an important organic dibasic acid, which can undergo salt-forming reactions, esterification reactions, amidation reactions, etc., and can be polycondensed with diamines or diols to form polymers, etc. . Adipic acid is an industrially important dicarboxylic acid, which plays an important role in chemical production, organic synthesis industry, medicine, lubricant manufacturing, etc., and its output ranks second among all dicarboxylic acids. A large amount of waste liquid will be generated in the production process of diacid and its related products. If it is discharged directly, it will cause environmental pollution and is very unfriendly to the environment. Contents of the invention [0003] The object of the present invention is to provide a time-consuming evapora...

AI Technical Summary

Problems solved by technology

Adipic acid is an industrially important dicarboxylic acid, which plays an important role in chemical production, organic synthesis industry, medicine, lubricant manufacturing, etc., and its output ranks second among all dicarboxylic acids. A large amount of waste liquid will be produced in the production process of diacid and its related products. If it is discharged directly, it will cause environmental pollution and is very unfriendly to the environment.

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