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Method for treating glycerin-based epoxy chloropropane saponification wastewater

A technology of epichlorohydrin and saponification wastewater, which is applied in chemical instruments and methods, natural water treatment, multi-stage water treatment, etc., and can solve problems such as unclear residence time of activated carbon adsorption, complex composition, and increased organic oxygen demand. , to achieve the effect of short residence time, lower COD value and simple process flow

Active Publication Date: 2015-05-13
CHINA TIANCHEN ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the composition in the saponification waste water of glycerol method is comparatively complicated, and the organic matter such as chlorinated alkanes, chlorohydrins has not been processed, and the organic acid contained in dichloropropanol is mixed with dichloropropanol, monochloropropanol, glycerin (glycerol) simultaneously. ) is easy to generate ester, and a small amount of ester is easy to enter the downstream saponification waste liquid, causing the color of the waste water to be light yellow, and the organic oxygen demand (COD) increases rapidly
At the same time, the patent does not specify the residence time and other parameters required for activated carbon adsorption

Method used

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  • Method for treating glycerin-based epoxy chloropropane saponification wastewater
  • Method for treating glycerin-based epoxy chloropropane saponification wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The concentration of calcium chloride-containing calcium chloride in the glycerol process epichlorohydrin saponification wastewater is 15% (weight ratio), the COD content is 8890ppm, and it is light yellow wastewater.

[0032] Through step 1: by adding pure oxygen generated by the oxygen generator, add the fully mixed flow bubbling bed reactor at 200°C for gas-liquid reaction, the reaction pressure is 10barG, and the residence time is 1 hour. After the reaction, the COD is reduced to 4680ppm. The reaction wastewater was transformed from light yellow to light yellow, and the pH value remained constant at 9 during the reaction.

[0033] After the treatment, the color of the treated wastewater changes from light yellow to light yellow. For the first type of substances, they are formed during the chlorination of glycerin, including chlorinated hydrocarbons, chlorohydrins and chlorinated ketones. Some substances are yellow, and high temperature High-pressure oxygen is oxidiz...

Embodiment 2

[0038] The concentration of calcium chloride-containing calcium chloride in the glycerol process epichlorohydrin saponification wastewater is 15% (weight ratio), the COD content is 8890ppm, and it is light yellow wastewater.

[0039] Through step 1: by adding the oxidant hydrogen peroxide, spraying into the reactor, adding a fully mixed flow bubbling bed reactor at 140°C for gas-liquid reaction, the reaction pressure is 5barG, and the residence time is 5 hours. After the reaction, the COD is reduced to 5280ppm. The reaction wastewater was transformed from light yellow to light yellow, and the pH value was constant at 10 during the reaction.

[0040] After the treatment, the color of the treated wastewater is transformed from light yellow to light yellow. For the first type of substance, it is formed during the chlorination of glycerin. The subsequent separation cannot guarantee the purity of dichloropropanol. For the first type of substance, it includes Chlorinated hydrocarbon...

Embodiment 3

[0045] The concentration of calcium chloride-containing calcium chloride in the glycerol process epichlorohydrin saponification wastewater is 15% (weight ratio), the COD content is 8890ppm, and it is light yellow wastewater.

[0046] Through step 1: by adding oxidant air, add fully mixed flow bubbling bed reactor at 300°C for gas-liquid reaction, the reaction pressure is 36barG, and the residence time is 1 hour. After the reaction, the COD is reduced to 4150ppm, and the reaction wastewater changes from light yellow It turns pale yellow and the pH is constant at 9 during the reaction.

[0047] After the treatment, the color of the treated wastewater is transformed from light yellow to light yellow. For the first type of substance, it is formed during the chlorination of glycerin. The subsequent separation cannot guarantee the purity of dichloropropanol. For the first type of substance, it includes Chlorinated hydrocarbons and chlorohydrins, some of which are yellow in color, be...

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Abstract

The invention relates to a method for treating glycerol-based epoxy chloropropane saponification wastewater. The method comprises the following operating steps: step one, high temperature and high pressure oxidation technology; step two, resin adsorption technology; step three, deep oxidation evaporation technology. The method has the benefits that the technological process is simple and short in residence time, high-concentration organic matters remaining in the saponification wastewater and formed in the glycerol chlorination process can be effectively removed, and the COD value in the wastewater is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, and in particular relates to a method for treating waste water of glycerin process epichlorohydrin saponification. Background technique [0002] Epichlorohydrin (alias epichlorohydrin), the chemical name is 1-chloro-2,3-epoxypropane, and the molecular formula is C 3 h 5 OCl is an important organic chemical raw material. [0003] The two-step production of epichlorohydrin from biodiesel by-product glycerol is currently the most advanced production process. Under the catalysis of organic acids, glycerin reacts with hydrogen chloride to form dichloropropanol intermediate with a purity of at least 98% (weight ratio) Products, Dichloropropanol and Calcium Hydroxide (Ca(OH) 2 ), sodium hydroxide (NaOH) and other alkaline aqueous solution saponification reaction, dichloropropanol dehydrochlorination and calcium hydroxide (Ca(OH) 2 ) react to form calcium chloride (CaCl 2 ). The reacti...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F103/36
CPCC02F1/04C02F1/285C02F1/66C02F1/722C02F1/727C02F1/74C02F1/78C02F9/00C02F2101/34C02F2101/36C02F2103/36C02F2301/08
Inventor 赵敏伟杨克俭李荣梁军湘兰杰闫伟周利波吕威鹏郭启迪闫哲吴凡龙滢肖辉张二涛王志明王宪张海伦隋希之丁发展王绍伟
Owner CHINA TIANCHEN ENG
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