Treatment method of chlorinated polyethylene production wastewater

Abstract

The invention discloses a treatment method of chlorinated polyethylene production wastewater. The method comprises the following steps: firstly, CPE (chlorinated polyethylene)-containing acidic slurry is treated by using a calcium chloride aqueous solution to obtain a CPE and calcium chloride neutral suspension containing water and a filtered clear liquid containing calcium chloride and hydrochloric acid; then, the neutral suspension is treated by using clear water to obtain a water-containing CPE suspension and a calcium chloride clear liquid; the calcium chloride clear liquid is reused in treatment of the CPE-containing acidic slurry, and the water-containing CPE suspension is used for preparing CPE; the clear liquid containing calcium chloride and hydrochloric acid is treated with lime to obtain calcium chloride liquid and calcium precipitates, the calcium precipitates are conveyed to a brickmaking factory, the calcium chloride liquid is treated with a sodium sulfate solution to obtain calcium sulfate dihydrate crystals and a sodium chloride solution, the calcium sulfate dihydrate crystals are sold, and the sodium chloride solution is fed to a chlor-alkali factory after COD is removed to serve as a raw material. According to the method, the consumption of water in the washing process of the CPE is reduced, the acid wastewater is changed into a recyclable resource, and clean production, energy conservation and consumption reduction are realized.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology, and in particular relates to a treatment method for chlorinated polyethylene production wastewater. Background technique [0002] With the rapid development of the economy, the pressure of water resource shortage is increasing, and the importance of rational use of water resources is becoming more and more prominent. Only by fully respecting the law of the natural cycle of water resources, realizing multiple recycling of water resources, and maintaining water resources The cycle balance of water is the effective way of sustainable utilization of water resources, and it is also the basis for the sustainable development of production enterprises. Water saving and sewage treatment for production enterprises is not only an inevitable choice for the sustainable development of society. [0003] In the production process of chlorinated polyethylene (CPE), the polymer reacts with ...

AI Technical Summary

Problems solved by technology

If the waste water is directly discharged, it will seriously pollute the environment. It is treated by conventional waste water treatment process, because it contains a lot of raw materials and is the neutralization product of strong acid, so the waste of conventional treatment is huge.

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