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Method for treating cyclization wastewater generated in production process of epoxy chloropropane

A technology for the production process of epichlorohydrin, which is applied in the field of cyclization wastewater treatment, can solve the problems of reducing the competitiveness of epichlorohydrin products, strong corrosion of salt wastewater, and no clear instructions, so as to shorten the residence time, The effect of increasing the concentration of salt and accelerating speed

Inactive Publication Date: 2020-11-03
HUIZHI ENG SCI & TECH CO LTD
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Problems solved by technology

This cleaning process does not involve the treatment of organic matter in wastewater, and it is not clearly stated whether organic matter in wastewater will cause membrane fouling
[0005] Enterprises with economic strength often adopt high-temperature ozone oxidation process, which can effectively remove organic matter in wastewater. However, due to the strong corrosion of salty wastewater at high temperature, the investment in equipment is increased, and the operating cost is also high. This type of process directly Reduce the competitiveness of epichlorohydrin products

Method used

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  • Method for treating cyclization wastewater generated in production process of epoxy chloropropane
  • Method for treating cyclization wastewater generated in production process of epoxy chloropropane

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Embodiment 1

[0036] In this example, the composition of the wastewater produced by the cyclization of calcium hydroxide to epichlorohydrin is shown in Table 1.

[0037] Table 1. The composition table of the wastewater produced by the cyclization of calcium hydroxide to epichlorohydrin

[0038] serial number name Specification 1 water (H 2 O)

0.828 2 Calcium Hydroxide (Ca(OH) 2 ),wt%

0.006 3 Magnesium Hydroxide (Mg(OH) 2 ),wt%

0.009 4 Calcium Chloride (CaCl 2 ),wt%

0.134 5 Glycerin (C 3 h 8 o 3 ),wt%

0.012 6 Monochloropropanediol (C 3 h 7 ClO 2 ),wt%

0.0006 7 Calcium Carbonate (CaCO 3 ),wt%

0.010 8 Calculation of chemical oxygen demand COD, mg / L 10688

[0039] (1) Pretreatment

[0040] The cyclized calcium chloride wastewater from the bottom of the cyclization tower of the epichlorohydrin unit enters the wastewater buffer tank, adds 30% hydrochloric acid to adjust the pH to 5-6, and...

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Abstract

The invention belongs to the technical field of high-salt and high-organic matter wastewater treatment, and relates to a method for treating cyclization wastewater generated in the production processof epoxy chloropropane. The treatment method comprises the steps of (1) pretreatment, (2) catalytic oxidation, (3) electrodialysis and (4) aftertreatment. The method adopts a hydrogen peroxide-catalyst combination mode, and is characterized in that the use amount of hydrogen peroxide is reduced; through contact with the catalyst, the degradation speed of organic matters is increased, the reactiontime is shortened, the residence time of cyclized wastewater in the reaction tank is shortened, and the occupied area and equipment investment of the reaction tank are reduced. Salt and organic matterare separated through electrodialysis, and meanwhile, saline water is concentrated, the load of multiple-effect evaporation is reduced, and the steam consumption is reduced. In biochemical treatment,due to reduction of salt, the activity of strains is improved, and the efficiency of biochemical reaction is greatly improved; In addition, the concentration of salt is improved through electrodialysis concentration, so that the amount of treated water is reduced, and the sewage treatment difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of high-salt and high-organic waste water treatment, and relates to a method for treating cyclization waste water produced in the production process of epichlorohydrin. Background technique [0002] The cyclization stage of the epichlorohydrin production process produces a large amount of brine with high organic content. The general treatment process mainly includes: the brine after pH adjustment enters into multi-effect evaporation, after distilled water, it is centrifuged to separate the salt containing organic matter, and the evaporated Water enters biochemical treatment. The industrial salt prepared by this process has high COD, which is generally defined as hazardous waste and needs to be handled by units with hazardous waste treatment qualifications. Due to the high output of this kind of salt, it not only increases the burden on enterprises, but also increases environmental pollution, which is neithe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36C02F101/30
CPCC02F1/001C02F1/04C02F1/4693C02F1/66C02F1/722C02F1/725C02F3/00C02F9/00C02F2101/30C02F2103/36
Inventor 刘霞陈晓荣齐运峰
Owner HUIZHI ENG SCI & TECH CO LTD
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