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Pretreatment process of high-salinity wastewater in epoxy resin production

An epoxy resin and pretreatment technology, applied in water/sewage treatment, natural water treatment, water treatment parameter control, etc., can solve the problems of biochemical treatment efficiency decline, evaporator efficiency decline, high COD content, etc., to reduce treatment costs , Simplified operation, simple process effect

Inactive Publication Date: 2020-08-18
无锡厚德石化工程设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the waste water contains a lot of organic matter, if it directly enters the three-effect evaporation or MVR device for evaporation, due to the presence of organic matter, the efficiency of the evaporator will be greatly reduced, the energy consumption will increase, and the COD content of the biochemical water will be high. lead to a decrease in the efficiency of biochemical treatment

Method used

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  • Pretreatment process of high-salinity wastewater in epoxy resin production

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Comparison scheme
Effect test

Embodiment 1

[0041] A pretreatment process for high-salinity waste water in the production of epoxy resin, said process comprising the steps of:

[0042] (1) The high salinity waste water to be treated and toluene are added into Venturi mixer 1 and mixed; waste water:

[0043] The mass ratio of toluene is 5:1;

[0044] (2) Add the mixed material obtained in step (1) into the stirred tank 2, and stir for 60min at a temperature of 90°C and a stirring speed of 300rpm / min for stirring and extraction;

[0045] (3) The material that is mixed evenly and has reached the extraction effect enters the settling tank 5 from the middle and upper part and settles for 30 minutes, automatically stratified;

[0046] Height difference H=[(density of waste water-toluene density)×(height of discharge pipe of waste water-two-phase interface height)] / toluene density; (600mm)

[0047] (4) The layered toluene containing aging resin and organic solvent overflows from the top of the tank to the toluene buffer tank...

Embodiment 2

[0050] A pretreatment process for high-salinity waste water in the production of epoxy resin, said process comprising the steps of:

[0051] (1) The high salinity waste water to be treated and toluene are added into Venturi mixer 1 and mixed; waste water:

[0052] The mass ratio of toluene is 20:1;

[0053] (2) Add the mixed material obtained in step (1) into the stirred tank 2, and stir for 30min at a temperature of 70°C and a stirring speed of 400rpm / min for stirring and extraction;

[0054] (3) The material that is mixed evenly and has reached the extraction effect enters the settling tank 5 from the middle and upper part and settles for 20 minutes, automatically stratified;

[0055] Height difference H=[(density of waste water-toluene density)×(height of discharge pipe of waste water-two-phase interface height)] / toluene density; (600mm)

[0056] (4) The layered toluene containing aging resin and organic solvent overflows from the top of the tank to the toluene buffer tan...

Embodiment 3

[0059] A pretreatment process for high-salinity waste water in the production of epoxy resin, said process comprising the steps of:

[0060](1) The high salinity waste water to be treated and toluene are added into Venturi mixer 1 and mixed; waste water:

[0061] The mass ratio of toluene is 15:1;

[0062] (2) Add the mixed material obtained in step (1) into the stirred tank 2, and stir for 45min at a temperature of 80°C and a stirring speed of 350rpm / min to carry out stirring and extraction;

[0063] (3) The material that is mixed evenly and has reached the extraction effect enters the settling tank 5 from the middle and upper part and settles for 25 minutes, automatically stratified;

[0064] Height difference H=[(density of waste water-toluene density)×(height of discharge pipe of waste water-two-phase interface height)] / toluene density; (600mm)

[0065] (4) The layered toluene containing aging resin and organic solvent overflows from the top of the tank to the toluene bu...

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Abstract

The invention discloses a pretreatment process of high-salinity wastewater in epoxy resin production. The process comprises the following steps: (1) adding to-be-treated high-salinity wastewater and methylbenzene into a Venturi mixer 1 for mixing; (2) adding the mixed material into a stirring kettle 2, and carrying out stirring extraction; (3) adding the materials into a settling tank 5 for settling, and automatically layering; (4) overflowing the layered toluene containing the aged resin and the organic solvent to a toluene buffer tank 3 from the top of the tank; and (5) enabling the clarified wastewater after layering to enter a wastewater buffer tank 6 from the bottom of the tank, and then conveying the wastewater to a downstream MVR treatment device by using a wastewater discharge pump7. Before the high-salinity wastewater is conveyed to multi-effect evaporation or MVR (mechanical vapor recompression), a pretreatment process is added to remove other organic matters containing methylbenzene, aged resin and the like, so that low-energy-consumption stable operation of triple-effect or MVR and biochemical treatment is guaranteed.

Description

technical field [0001] The application of the present invention relates to the technical field of wastewater treatment, in particular to a pretreatment process for high-salt wastewater in epoxy resin production. Background technique [0002] In the production process of epoxy resin, a large amount of waste water will be produced. The high-salt waste water contains a large amount of inorganic salts, and contains organic and inorganic pollutants such as toluene and aging resin. The COD concentration is extremely high. Now the domestic high-salt waste water treatment technology Generally, after three-effect evaporation and MVR, industrial salt is evaporated and recovered, and then sent to sewage treatment for biochemical treatment. [0003] However, since the waste water contains a lot of organic matter, if it directly enters the three-effect evaporation or MVR device for evaporation, due to the presence of organic matter, the efficiency of the evaporator will be greatly reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/36
CPCC02F9/00C02F1/26C02F2001/007C02F1/041C02F1/048C02F2103/36C02F2209/08C02F2303/18
Inventor 胡立宇朱振中马敏吉袁大权陈腾蛟戴哲彬
Owner 无锡厚德石化工程设计有限公司
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