Method and apparatus for pretreatment of chlorinated resin polymerization mother liquor

Abstract

The invention provides a method and apparatus for pretreatment of chlorinated resin polymerization mother liquor. The apparatus comprises a muddy water separation tank, a filter press, a filtrate collecting tank, a reaction vessel and a centrifuge, wherein the centrifuge is provided with a filtrate outlet and a product outlet and the filtrate outlet is communicated with the filtrate collecting tank. The method for pretreatment of the chlorinated mother liquor comprises the following steps: S1, adding the resin polymerization mother liquor and a resin flocculating agent into the muddy water separation tank and carrying out stirring; S2, adding a solid-liquid mixture into the filter press; S3, collecting filtrate obtained after filtering in the S2 into the filtrate collecting tank; S4, collecting the filtrate collected in the filtrate collecting tank in the S3 into the reaction vessel, adding NaOH into the reaction vessel at the same time and adjusting the pH value of the filtrate in the reaction vessel to 7; and S5, adding a reaction product of S4 into the centrifuge so as to separate out a white precipitate. The apparatus provided by the invention is simple in structure, convenient in flow and low in investment cost and operation cost. The mother liquor is directly pretreated and then neutralized with alkali to produce the zinc oxide precipitate; so good recovery effect is obtained, and subsequent recovery of zinc chloride is facilitated.

Description

technical field [0001] The invention relates to the field of wastewater treatment systems, in particular to a method and equipment for pretreating chlorinated mother liquor with resin polymerization mother liquor. Background technique [0002] In the chlorination process of anion resin production, zinc chloride is only used as a catalyst and does not participate in the reaction, and the content of zinc chloride in the mother liquor is above 45%. The main components in the mother liquor are: zinc chloride, part of chloromethyl ether, formaldehyde, benzene substances, small molecular polymers, etc. [0003] A large amount of zinc chloride is completely dissolved in the mother liquor in the acidic mother liquor. The mother liquor contains complex organic matter such as tar, and there are many impurities, and the mother liquor is a black viscous liquid. [0004] At present, most of the recycling methods used at home and abroad are heated to a certain temperature at high temper...

AI Technical Summary

Problems solved by technology

In addition, since there are many impurities in the mother liquor, it is not acceptable to evaporate and crystallize the mother liquor.

However, if an incinerator is used, due to the low boiling point of zinc chloride and the local difficulty in controlling the temperature of the furnace, zinc chloride evaporates and is difficult to recycle.

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