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Treatment method of epoxy resin production waste water

A treatment method and technology for producing waste water, applied in multi-stage water treatment, natural water body treatment, water treatment parameter control, etc., can solve problems such as waste of resources and increase in production capacity

Inactive Publication Date: 2019-01-18
JIANGSU KUMHO YANGNONG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, epichlorohydrin is still contained in the waste water after stripping, and the COD of the waste water can still reach 20,000 mg / L. Direct biochemical treatment of the waste water after the stripping will cause waste of resources such as glycerin and monochloropropanediol in the waste water, and with With the increase of production capacity of epoxy resin, the amount of wastewater produced poses a challenge to the treatment capacity of the biochemical pool, which seriously restricts the increase of production capacity

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  • Treatment method of epoxy resin production waste water

Examples

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Effect test

Embodiment 1

[0036]A method for treating wastewater from epoxy resin production, comprising the following steps: subjecting COD18900ppm stripping tower kettle water to low-temperature and low-pressure evaporation concentration (primary evaporation concentration), pressure 50KPa, temperature 70°C, heat preservation for 120min; adding NaOH to adjust pH to neutral , the operating pressure of secondary evaporation and concentration is 4KPa, the temperature is 105°C, and the temperature is kept for 30 minutes. The main components of the concentrated solution obtained by final evaporation and concentration are: 79wt% of monochloropropanediol, 16wt% of glycerin, and 2.3wt% of water. Throw 1200g of concentrated solution into a four-necked flask, add 240g of glacial acetic acid as a catalyst, raise the temperature to 80°C, and continue to pass HCl gas at a rate of 15L / min, keep the temperature at 95°C for 16 hours, and concentrate after chlorination The quality content of dichloropropanol in the liq...

Embodiment 2

[0038] A method for treating waste water containing epichlorohydrin in the production process of epoxy resin, comprising the following steps: the COD is 19800ppm stripping tower kettle water through low temperature and low pressure evaporation concentration (primary evaporation concentration), operating pressure 70KPa, temperature 90 ℃, Insulate for 180 minutes; add NaOH to adjust the pH to neutral, the operating pressure of the second evaporation concentration is 5KPa, the temperature is 108°C, and keep warm for 25 minutes. The main components of the final concentrated solution are: 80wt% monochloropropanediol, 15wt% glycerin, and 2.5wt% water %. Throw 1300g of concentrated solution into a four-necked flask, add 250g of glacial acetic acid as a catalyst, raise the temperature to 80°C, pass HCl gas at a rate of 17L / min for hydrogen chloride gas, and keep the temperature at 100°C for 8 hours. The mass content of dichloropropanol in the concentrated solution after chlorination i...

Embodiment 3

[0040] A method for treating waste water containing epichlorohydrin in the epoxy resin production process, comprising the following steps: the COD is 21100ppm stripping tower kettle water through low temperature and low pressure evaporation concentration (primary evaporation concentration), operating pressure 90KPa, temperature 90 ℃, Insulate for 300 minutes; add NaOH to adjust the pH to neutral, the second evaporation concentrates the operating pressure at 6KPa, the final concentration temperature is 110°C, and maintains the temperature for 20 minutes to adjust the pH to neutral. The main components of the obtained concentrated solution are: monochloropropanediol 82wt%, glycerin 14wt%, water 2.8wt%. Throw 1350g of concentrated solution into a four-necked flask, add 280g of glacial acetic acid as a catalyst, heat up to 80°C, pass HCl gas at a rate of 18L / min, keep the temperature at 105°C for 6 hours, and the concentrated solution after chlorination The quality content of dich...

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Abstract

The invention relates to the field of epoxy resin production, and particularly relates to a treatment method of epoxy resin production waste water. The treatment method of the epoxy resin production waste water provided by the invention comprises the following steps: collecting epoxy resin production waste water after treatment of a stripping column in a column of the stripping column to obtain column water; performing primary concentration by evaporation on the column water to obtain pre-concentrated liquid; adjusting the pH value of the pre-concentrated liquid to be neutral, and then performing secondary concentration by evaporation to obtain concentrated liquid; and performing chlorination treatment on the concentrated liquid, and performing reduced pressure distillation to obtain dichlorohydrin, wherein the purity of the dichlorohydrin is 98.5-99.5wt%, and the chemical oxygen consumption of condensation water generated by primary concentration by evaporation and secondary concentration by evaporation is less than or equal to 1200mg / L. The treatment method provided the invention fully utilizes the materials in the epoxy resin production waste water, and achieves the purpose of recycling of waste, and the distilling condensation water obtained by concentration by evaporation treatment can achieve the standard of reuse water.

Description

technical field [0001] The invention relates to the field of epoxy resin production, in particular to a treatment method for epoxy resin production wastewater. Background technique [0002] In the production of epoxy resin, epichlorohydrin is one of the main raw materials for the synthesis of epoxy resin. In the main reaction stage, the water generated by the reaction in the system and the unreacted epichlorohydrin are recovered through decompression azeotropy, and the water and After the mixture of epichlorohydrin is left to stand and stratified, the epichlorohydrin in the lower layer can be directly used as a raw material for production, and the water phase in the upper layer can be used as waste water. Since epichlorohydrin is slightly soluble in water, the solubility in water at room temperature is about 6g / 100mL, so the wastewater obtained from the upper aqueous phase still contains epichlorohydrin, and the chemical oxygen demand (COD) of the wastewater is as high as 50...

Claims

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Application Information

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IPC IPC(8): C02F9/10C07C31/36C07C29/62C02F103/38
CPCC02F1/04C02F1/66C02F9/00C02F2103/38C02F2209/08C02F2301/08C07C29/62C07C31/36
Inventor 侯晶晶孙祥陈铭铸杨颖杨健俞孝伟
Owner JIANGSU KUMHO YANGNONG CHEM CO LTD
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