Treatment method of condensed wastewater generated in para-ester production process

A treatment method and technology in the production process, applied in the field of condensation wastewater treatment, can solve the problems of increasing the difficulty of treatment, loss of excessive condensing agent, increase of COD in wastewater, etc., achieve low cost, realize recycling, and reduce the effect of COD value

Active Publication Date: 2017-12-29
新乡市锦源化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The condensation reagents currently used are generally ethylene oxide or chlorohydrin. In order to make the reaction complete, ethylene oxide or chlorohydrin is usually excessive in the process of synthesis, and the excess condensing agent will eventually be lost with the waste water, which causes resource waste. waste, and at the same time increase the COD of wastewater, which is difficult to treat with general methods and increases the difficulty of treatment

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  • Treatment method of condensed wastewater generated in para-ester production process

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Effect test

Embodiment 1

[0025] In the para-ester condensation process, ethylene oxide is used to condense, neutralize with hydrochloric acid, and filter to obtain condensation waste water. Get 400ml condensation waste water (COD value is 35910ppm) and add in 500ml flask, stir and heat up, by evaporation concentration (adopt MVR evaporator to carry out evaporation concentration), cooling crystallization, the steps such as filtration, obtain sodium sulfate 71.84g, sodium chloride 42.34g, Evaporated liquid 332.8ml. The evaporative liquid was collected and put into a 500ml flask, toluene was added as a water-carrying agent, heated, and azeotropically distilled to obtain 42.46 g of a concentrated solution containing chloroethanol with a chloroethanol content of 39.5%.

[0026] The mixed solution of water-carrying agent and water obtained in the azeotropic distillation step was allowed to stand for stratification, and the obtained water was collected, and the COD value was measured to be 237 ppm.

Embodiment 2

[0028] The para-ester condensation process adopts ethylene oxide to condense, neutralize with sulfuric acid, and filter to obtain condensation waste water. 400ml of condensation waste water (COD value 38218ppm) was taken into a 500ml flask, 35g of 32% hydrochloric acid was added, the temperature was raised to 60°C with stirring, and the reaction was carried out for 5 hours. Then continue to heat up, and obtain 39.74 g of sodium chloride, 97.06 g of sodium sulfate, and 336.4 ml of evaporative liquid through the steps of evaporative concentration (using MVR evaporator for evaporative concentration), cooling crystallization, and filtration. The evaporative liquid was collected and put into a 500ml flask, benzene was added as a water-carrying agent, heated, and azeotropically distilled to obtain 35.63 g of a concentrated solution containing chloroethanol with a chloroethanol content of 46.7%.

[0029] The mixed liquid with water agent and water obtained in the azeotropic distillat...

Embodiment 3

[0031] The para-ester condensation process adopts chloroethanol to condense, and the condensation waste water is obtained by filtration. Get 400ml of condensation waste water (COD value is 36365ppm) and add it in 500ml flask, stir and heat up, through steps such as evaporation concentration (using MVR evaporator to carry out evaporation concentration), cooling crystallization, filtration, obtain sodium chloride 38.53g, sodium sulfate 63.82g, Evaporated liquid 322.5ml. The evaporative liquid was collected and put into a 500ml flask, benzene was added as a water-carrying agent, heated, and azeotropically distilled to obtain 42.75g of a concentrated solution containing chloroethanol with a chloroethanol content of 42.8%.

[0032] The mixed liquid with water agent and water obtained in the azeotropic distillation step was allowed to stand for stratification, and the obtained water was collected, and its COD value was measured to be 218 ppm.

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Abstract

A treatment method of condensed wastewater generated in a para-ester production process is characterized in that the condensed wastewater contains ethylene chlorohydrin; and the treatment method comprises the following steps of: 1) performing evaporation, concentration, cooling crystallization and filtration on the condensed wastewater to form crystalloid salt and evaporated liquid, 2) adding a water-carrying agent into the evaporated liquid obtained in step 1), heating for azeotropic dehydration, and obtaining an azeotrope and concentrated liquid. The treatment method is concise in technical flow, simple to operate and low in cost, and no secondary pollutant is generated. The condensed wastewater in the para-ester production process can be treated more effectively; at the same time, an ethylene chlorohydrin product meeting recycling requirements is obtained; the wastewater treatment is achieved; and at the same time, resources are comprehensively utilized.

Description

technical field [0001] The invention relates to a method for treating condensation waste water produced in the production process of para-ester. Background technique [0002] Para-ester is an important reactive dye intermediate, which is used to synthesize EF type, KN type, M / KM type, ME type and other reactive dyes containing vinylsulfone group. The production process of para-ester is obtained by taking the antipyretic ice as the main raw material, through sulfonation, chlorination, reduction, condensation, esterification and other procedures. The currently used condensing agent is generally ethylene oxide or chloroethanol. In order to carry out the reaction thoroughly, ethylene oxide or chloroethanol is usually excessive in the synthesis process, and the excess condensing agent is eventually lost with the wastewater, which causes resource consumption. waste, and at the same time increase the COD of wastewater, it is difficult to treat with general methods, which increases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/36
CPCC02F1/001C02F1/048C02F1/22C02F1/66C02F9/00C02F2001/5218C02F2103/36
Inventor 樊明伟郭理想魏艳军阮海兴彭春嘉陈伟东
Owner 新乡市锦源化工有限公司
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