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A kind of treatment process of epichlorohydrin production waste water

A technology for the production of epichlorohydrin and waste water, which is applied in the direction of oxidized water/sewage treatment, water/sewage treatment, natural water treatment, etc. It can solve the problems of complicated treatment steps and increase the cost of waste water treatment, and achieve low cost of waste water treatment, The effect of small footprint and simple process flow

Active Publication Date: 2018-05-15
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the effect of this treatment method is good, the treatment steps are complicated, which seriously increases the cost of wastewater treatment.

Method used

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  • A kind of treatment process of epichlorohydrin production waste water

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Effect test

Embodiment 1

[0026] A kind of epichlorohydrin production wastewater, the TOC of the wastewater is measured to be about 13000mg / L, the pH=10.5, and the salt content is 3%.

[0027] (1) Wet oxidation: The epichlorohydrin wastewater was treated by wet oxidation, and the salt-containing filtrate I was obtained by filtration, and its TOC was determined to be 680mg / L. Wet oxidation reaction conditions: the gas is air, the reaction temperature is 260°C, the reaction pressure is 2MPa, and the reaction time is 2h;

[0028] (2) UV-H 2 o 2 Oxidation: adjust the pH of the salt-containing filtrate I obtained in step 1 to 5, add 2% hydrogen peroxide (the quality of the salt-containing filtrate I is the benchmark), stir evenly, then place it in a photocatalytic reactor, turn on the 300w ultraviolet light source, and react for 1h , the salt-containing filtrate II was obtained, and its TOC was reduced to 18mg / L;

[0029] (3) Preparation of caustic soda: The salt-containing filtrate II obtained in step 2...

Embodiment 2

[0031] A kind of epichlorohydrin production wastewater, the TOC of the wastewater is measured to be about 13000mg / L, the pH=10.5, and the salt content is 3%.

[0032] (1) Catalytic wet oxidation: Epichlorohydrin waste water was treated by wet oxidation, filtered and separated to obtain salt-containing filtrate I, and its TOC was determined to be 386mg / L. Catalytic wet oxidation reaction conditions: the catalyst is CuSO 4 , the dosage is 0.5% of the waste water, the gas is air, the reaction temperature is 260°C, the reaction pressure is 2MPa, and the reaction time is 2h;

[0033] (2) UV-H 2 o 2 Oxidation: adjust the pH of the salt-containing filtrate I obtained in step 1 to 5, add 2% hydrogen peroxide (the quality of the salt-containing filtrate I is the benchmark), stir evenly, then place it in a photocatalytic reactor, turn on the 300w ultraviolet light source, and react for 1h , the salt-containing filtrate II was obtained, and its TOC was reduced to 8mg / L;

[0034] (3) ...

Embodiment 3

[0036] A kind of epichlorohydrin production wastewater, the TOC of the wastewater is measured to be about 13000mg / L, the pH=10.5, and the salt content is 3%.

[0037] (1) Wet oxidation: The epichlorohydrin wastewater was treated by wet oxidation, filtered and separated to obtain salt-containing filtrate I, and its TOC was determined to be 680mg / L. Wet oxidation reaction conditions: the gas is air, the reaction temperature is 260°C, the reaction pressure is 2MPa, and the reaction time is 2h;

[0038] (2) UV-H 2 o 2 Oxidation: adjust the pH of the salt-containing filtrate I obtained in step 1 to 5, add 2% hydrogen peroxide, stir evenly, then place it in a photocatalytic reactor, turn on a 300w ultraviolet light source, and react for 1 hour to obtain the salt-containing filtrate II, whose TOC After adding 0.4% hydrogen peroxide and continuing to react for 1 hour, the measured filtrate TOC dropped to 7mg / L.

[0039] (3) Preparation of caustic soda: The salt-containing filtrate ...

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Abstract

The invention discloses a treatment process of epoxy chloropropane production wastewater. The process includes the following steps that wet oxidization is performed, after the wastewater is subjected to wet oxidization, and filter liquor I containing salt is obtained through filtration and separation; secondly, ultraviolet-H2O2 oxidation is performed, the pH of the filter liquor I containing salt is adjusted to be 3-5, hydrogen peroxide is added and evenly stirred, the mixture is placed in a photocatalytic reactor, and filter liquor II containing salt is obtained under the aeration condition through the synergistic effect of ultraviolet and hydrogen peroxide; thirdly, caustic soda is prepared, wherein the filter liquor II obtained in the second step and containing salt directly enters an ionic film caustic soda preparation process. The problems in treating the epoxy chloropropane production wastewater are solved, wastewater is discharged in an up-to-standard mode by means of wet oxidization and photocatalytic oxidization, and resource utilization of sodium salt in the wastewater is achieved.

Description

technical field [0001] The invention relates to the field of chemical wastewater treatment, in particular to a treatment process for epichlorohydrin production wastewater. Background technique [0002] The chemical name of epichlorohydrin (ECH) is 3-chloro-1,2-epoxypropane, also known as epichlorohydrin, which can be used as an intermediate in the synthesis of glycerin, and chemical products such as epoxy resin, glass fiber reinforced plastics, and electrical insulation products main raw material. At present, the main production process of epichlorohydrin is propylene high-temperature chlorination method and propylene acetate-propenyl alcohol. In addition, very few companies use glycerin catalytic chlorination method, Interox method, acrolein method, and direct epoxidation method of allyl chloride , Acetone method and other techniques to synthesize epichlorohydrin. [0003] With the rapid development of industry, the demand for epichlorohydrin in various industries at home...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C25B1/46C02F103/36
CPCC02F1/32C02F1/72C02F1/722C02F1/725C02F1/727C02F1/74C02F2103/36C02F2305/023C25B1/46
Inventor 吕伏建王路峰龙江陈磊陈丽娜
Owner ZHEJIANG QICAI ECO TECH CO LTD
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