Method for recycling epoxy chloropropane in epoxy chloropropane wastewater and treating wastewater

A technology for epichlorohydrin and wastewater treatment, which is applied in water/sewage treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problem of high recovery cost and high energy consumption of epichlorohydrin problems, to achieve the effect of solving the problem of standard discharge or even zero discharge, improving economic benefits and shortening the service life

Inactive Publication Date: 2016-10-12
郑巧丹
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Problems solved by technology

[0005] The purpose of this invention is to provide a method for recovering epichlorohydrin in epichlorohydrin wastewater and its wastewater treatment method. By changing the raw materials and treatment methods, this method can not only solve the problem of high recovery cost and high energy consumption of epichlorohydrin It can also solve the problem of wastewater discharge up to standard or even zero discharge. At the same time, the by-product sodium chloride is rationally used to improve the economic benefits of the enterprise.

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  • Method for recycling epoxy chloropropane in epoxy chloropropane wastewater and treating wastewater

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Embodiment 1

[0021] A kind of epichlorohydrin recovery in epichlorohydrin waste water and its waste water treatment method comprise the following steps:

[0022] (1), Weigh 100 parts of bamboo charcoal, 36 parts of urea oxalate, 7 parts of water, 16 parts of polyurethane resin, 125 parts of ethanol, 75 parts of N,N-dimethylformamide and add them to the reactor, the stirring speed is 110r / Min, keep the system temperature at 60°C for 1h, distill the material under reduced pressure at 80°C and vacuum -0.07MPa for 2h, roast the material in a muffle furnace at 200°C for 2h, at 300°C for 2h, and at 450°C 2h, the material was naturally cooled to room temperature to obtain activated carbon;

[0023] (2) Weigh 100 parts of sodium chloride and 240 parts of epichlorohydrin wastewater into the reactor, and react for 0.6 h at a temperature of 25 ° C and a stirring speed of 140 r / min to obtain a pretreatment solution;

[0024] (3), after the pretreatment liquid was left standing at normal temperature ...

Embodiment 2

[0026] A kind of epichlorohydrin recovery in epichlorohydrin waste water and its waste water treatment method comprise the following steps:

[0027] (1) Weigh 100 parts of bamboo charcoal, 27 parts of urea oxalate, 5 parts of water, 13 parts of polyurethane resin, 90 parts of ethanol, and 60 parts of N,N-dimethylformamide and add them to the reactor, and the stirring speed is 80r / Min, keep the system temperature at 30°C for 0.3h, distill the material at 80°C and vacuum -0.05MPa for 2h, roast the material in a muffle furnace at 200°C for 2h, at 300°C for 2h, at 400°C Roasting for 2h, the material is naturally cooled to room temperature to obtain activated carbon;

[0028] (2) Weigh 100 parts of sodium chloride and 200 parts of epichlorohydrin waste water into the reactor, and react for 0.2 h at a temperature of 10 °C and a stirring speed of 120 r / min to obtain a pretreatment solution;

[0029] (3) After the pretreatment liquid is left standing at normal temperature and pressu...

Embodiment 3

[0031] A kind of epichlorohydrin recovery in epichlorohydrin waste water and its waste water treatment method comprise the following steps:

[0032](1) Weigh 100 parts of bamboo charcoal, 45 parts of urea oxalate, 12 parts of water, 20 parts of polyurethane resin, 150 parts of ethanol, and 90 parts of N,N-dimethylformamide and add them to the reactor at a stirring speed of 150r / min, keep the system temperature at 70°C for 2h, distill the material under reduced pressure at 80°C and vacuum -0.1MPa for 2h, roast the material in a muffle furnace at 200°C for 2h, at 300°C for 2h, and at 500°C 2h, the material was naturally cooled to room temperature to obtain activated carbon;

[0033] (2) Weigh 100 parts of sodium chloride and 300 parts of epichlorohydrin wastewater into the reactor, and react for 1 h at a temperature of 50 °C and a stirring speed of 180 r / min to obtain a pretreatment solution;

[0034] (3), after the pretreatment liquid is left standing at normal temperature an...

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Abstract

The invention relates to a method for recovering epichlorohydrin from epichlorohydrin wastewater and treating the wastewater. The method includes the following main steps: preparing a pretreatment solution, standing and stratifying the wastewater, adsorbing the wastewater by activated carbon, and treating the wastewater by a membrane module. The pretreatment solution is prepared by reacting sodium chloride and epichlorohydrin wastewater, and the activated carbon is prepared by reacting bamboo charcoal, oxalic acid urea, water, polyurethane resin, ethanol, and N,N-dimethylformamide. The advantage of the present invention is that the solubility of epichlorohydrin in the saturated aqueous sodium chloride solution is small, and separation and purification can be obtained by standing for stratification. It not only solves the problems of high recovery cost and high energy consumption of epichlorohydrin, but also solves the problem of up-to-standard discharge or even zero discharge of waste water. At the same time, the by-product sodium chloride is rationally used, which improves the economic benefits of the enterprise. The method is easy to operate, the activated carbon can be reused, the recovery rate of epichlorohydrin is high, and the waste water can reach the standard of reused water.

Description

technical field [0001] The invention relates to a method for recovering epichlorohydrin in epichlorohydrin waste water and treating the waste water. Background technique [0002] At present, many domestic epoxy resin manufacturers adopt the traditional production method, that is, the two-step alkali method to produce epoxy resin. The production process is as follows: First, add refined epichlorohydrin, epichlorohydrin and bisphenol A into the reactor, and after the raw materials are heated and dissolved, then add a small amount of caustic soda into the reactor for pre-reaction; secondly, pre-react After reacting for a period of time, add a large amount of caustic soda dropwise to react, and react for a period of time to make the main reaction fully react; moreover, under vacuum, the epichlorohydrin that has not reacted excessively is recovered by azeotropic distillation under reduced pressure; finally, recover After the epichlorohydrin is condensed, it is pumped into the cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01J20/20B01J20/30C07D303/08C07D301/32C02F101/34
CPCC02F9/00B01J20/20C02F1/283C02F1/441C02F1/442C02F1/444C02F2101/34C07D301/32C07D303/08
Inventor 郑巧丹
Owner 郑巧丹
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