Method for reducing COD content in discharged wastewater of cyclohexanone device

Abstract

The invention discloses a method for reducing COD content in discharged wastewater of a cyclohexanone device, wherein on the premise of ensuring a water seal function of a condensate recovery tank, the condensate in the condensate recovery tank is continuously or discontinuously pumped into a decomposition reaction kettle by arranging a booster pump. According to the invention, a condensate recovery tank and decomposition reaction kettle series production process is designed, the condensate in a condensate recovery tank is continuously or discontinuously pumped into a decomposition reaction kettle by arranging a booster pump, the condensate as the supplemented water of the decomposition reaction kettle can replace process water to supplement the decomposition reaction kettle while the condensate is extracted and separated through a large amount of cyclohexane in the decomposition liquid, so that the content of the organic matter in the condensate is reduced.

Description

technical field [0001] The invention relates to a method for reducing COD content in wastewater discharged from a cyclohexanone plant, and belongs to the technical field of cyclohexanone production. Background technique [0002] Cyclohexane oxidation is a common method for the preparation of cyclohexanone. In this method, cyclohexane is used as a raw material. Under the condition of no catalyst, the oxygen-enriched air will oxidize the cyclohexane to obtain an oxidized liquid, and the main component of the oxidized liquid is cyclohexyl hydroperoxide. The oxidizing solution is decomposed after being treated with lye, and cyclohexanone, cyclohexanol and other products such as esters, acids, aldehydes, etc. can be obtained. [0003] During the process of lye treatment of the oxidizing solution, the acid in the oxidizing solution will be neutralized, and the esters will undergo saponification reaction to generate organic acid sodium salt and cyclohexanol. A small amount of ket...

AI Technical Summary

Problems solved by technology

[0010]Aiming at the cyclohexanone / cyclohexanol vacuum condensate recovery process in the prior art, there are incomplete separation of condensate, large amount of discharged wastewater, and Defects such as high COD content, the purpose of the present invention is to provide a method that can effectively reduce the COD content in the wastewater discharged from the cyclohexanone plant. Promote application

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