Processing method of effluent brine produced in MDI production process

A production process and treatment method technology, which is applied in the field of industrial waste brine treatment, can solve the problems of large consumption of steam in the stripping tower, large amount of adsorbent, high treatment cost, etc., so as to improve the service life, reduce the degree of pollution, and solve the problem of environmental pollution. pollution effect
CN101665302AActive Publication Date: 2010-03-10WANHUA CHEMICAL (NINGBO) CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WANHUA CHEMICAL (NINGBO) CO LTD
Publication Date
2010-03-10
Patent Text Reader

Abstract

The invention discloses a processing method of effluent brine produced in MDI production process, comprising the following steps: (1) effluent brine containing phenylamine, diphenylmethane toluene diamine and polyamine, which is produced in MDI production process, carries out super-gravity extraction, and then tower-type extraction is carried out; (2) effluent brine discharged by the step (1) is fed to a stripping tower to carry out steam stripping; (3) effluent brine discharged from the stripping tower in step (2) and chemical oxidants are conveyed to an oxidation reactor, and air is vented to carry out aeration; (4) the effluent brine processed by the step (3) is transported to an adsorption tower to carry out adsorption. The effluent brine processed by the method of the invention has less than 8ppm of TOC, less than 2.5 ppm of TN (total nitrogen); sodium chloride and water and the other resources in effluent brine are realized, so as to carry out circulating utilization.
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Description

technical field

[0001] The invention relates to a treatment method of industrial waste brine, more specifically, a treatment method of waste brine produced in the production process of diphenylmethane diisocyanate (hereinafter referred to as MDI). Background technique

[0002] MDI is one of the main raw materials in the polyurethane industry. Condensation reaction of aniline and formaldehyde under the action of hydrochloric acid catalyst to obtain polymethylene polyphenyl polyamine, and then use polymethylene polyphenyl polyamine phosgenation reaction to produce monomeric MDI and polymeric MDI, which is a key technology in the polyurethane industry well-known methods.

[0003] Aniline and formaldehyde are condensed under the action of hydrochloric acid catalyst to obtain polymethylene polyphenylpolyamine hydrochloride, then neutralized with caustic soda, the brine layer and polyamine layer are separated, and the polyamine layer is washed with process water Refining again t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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