Caprolactam production wastewater treatment system and method

Abstract

The invention provides a caprolactam production wastewater treatment system and method. The treatment system comprises a raw water tank, a wastewater heat exchanger, a wastewater heater and an oxidation reactor which are sequentially connected, wherein a material inlet, a material outlet, a heat source inlet and a heat source outlet are formed in the wastewater heat exchanger; oxidized water from the oxidation reactor enters the wastewater heat exchanger from the heat source inlet, the heat source outlet is connected with a finished product tank, the material inlet is connected with the raw water tank, the material outlet is connected with the wastewater heater, a micro-interface generation system is arranged in the oxidation reactor, and the micro-interface generation system is used for dispersing the crushed gas into bubbles. According to the treatment system, after the micro-interface generator is arranged, the contact of thereaction phase interface is improved, and a good wastewater treatment effect can be obtained without using a catalyst or by adding a small amount of the catalyst.

Description

technical field [0001] The invention relates to the field of caprolactam production wastewater treatment, in particular to a treatment system and method for caprolactam production wastewater. Background technique [0002] Caprolactam is an important chemical material. Its main purpose is to produce polyurethane through polymerization, which can be further processed into fibers, plastics, films, etc. The main domestic production methods of caprolactam are the toluene method and the benzene method, but in the end, caprolactam is obtained through the liquid-phase Beckmann rearrangement reaction of cyclohexanone oxime. This process has a fast reaction speed and high conversion rate, but the wastewater produced by it is difficult to treat. larger. Wastewater mainly contains caprolactam, ammonium sulfate, acetic acid, toluene, benzoic acid, cyclohexane carboxylic acid, cyclohexane carboxylic acid sulfonic acid, hexahydrobenzoic acid, cyclohexane and other components. There are ma...

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Problems solved by technology

Since the COD of caprolactam wastewater is 5000-30000mg / L, a large amount of H will be consumed by Fenton method 2 o 2 , the treatment cost is high, while the wet oxidation method has defects such as high equipment requirements, long reaction time, and low COD elimination rate.

[0004] In the process of wet oxidation treatment, although the reaction time will be shortened to a certain extent and the operating temperature and pressure will be reduced by using the catalyst, the cost of the catalyst itself is relatively high. After the subsequent reaction is completed, the follow-up recovery of the catalyst should also be considered , The problem of handling, the operation is very inconvenient, and a lot of follow-up work has been added invisibly

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