Treatment apparatus and treatment method for wastewater produced during fumaric acid generation process

Abstract

The present invention discloses a treatment apparatus and a treatment method for wastewater produced during a fumaric acid generation process. The treatment apparatus comprises a heating chamber, a crystallizer, a rectification tower, a cooler, a crystal receiving groove, a reflux flow meter, a distillate flow meter, a centrifuge and a condenser. According to the present invention, the components in the acid water of a phthalic anhydride tail gas absorption tower are more, wherein water is the light key component, maleic acid is the heavy key component, and the relative volatility is 6 under a normal pressure and is 14.9 under a vacuum degree of 10 KPa, such that the relative volatility is greatly increased; the rectification principle is utilized, and the crystallization, the evaporation and other operation units are integrated so as to greatly increase the separation efficiency and save the energy source and the manpower; and the treatment apparatus and the treatment method have the following beneficial effects that: the cheap low-pressure steam is used to treat at a lower temperature, the COD content in the effluent after the rectification is less than 100 PPM, the PH value of the effluent is greater than 6, the effluent can be directly discharged, and the apparatus has characteristics of simple structure, easy control process, low operating temperature, safety, reliability, low cost, and small occupation space.

Description

technical field [0001] The invention relates to the field of industrial waste water treatment, in particular to a treatment device and a treatment method for waste water generated during the production of fumaric acid. Background technique [0002] Fumaric acid, also known as fumaric acid, is an important organic chemical raw material, which is obtained through isomerization of maleic acid, a by-product obtained during the production of phthalic anhydride. During its production process, a large amount of acidic wastewater (hereinafter referred to as fumaric acid production wastewater) will be produced. Among them, there are mainly organic impurities of phthalic acid / benzoic acid / citric acid, citric acid, citric acid, and thiourea, and the COD content of wastewater is as high as 5×10 4 ~20×10 4 , there are many processing methods now, for example: [0003] Advanced oxidation: COD concentration of fumaric acid production wastewater is greater than 5×10 4 It is difficult to...

AI Technical Summary

Problems solved by technology

The evaporation capacity of the second effect body drops rapidly, and the evaporation chamber is easy to block

[0008] Therefore, whether it is advanced oxidation, iron-carbon reduction, ion exchange, reverse osmosis membrane method, double-effect evaporator, it will cost a lot of money, manpower and material resources, and it is not easy to realize industrialization

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