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A membrane technology integrated treatment method for high-concentration acrylonitrile wastewater

A high-concentration acrylonitrile treatment method technology, applied in the field of membrane technology integrated treatment of high-concentration acrylonitrile wastewater, can solve the problems of membrane pollution, shortened membrane life, accelerated concentration polarization, etc., achieve high treatment efficiency, reduce treatment The effect of small cost and occupied area

Active Publication Date: 2016-06-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using nanofiltration alone to treat acrylonitrile reaction process water is prone to serious membrane fouling. After a period of operation, the oligomers in the wastewater will adhere to the membrane surface and accelerate concentration polarization, resulting in shortened membrane life. Therefore , using the integration of membrane separation technology to study an acrylonitrile wastewater treatment method that can effectively reduce membrane fouling is of great significance for industrial production and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Acrylonitrile wastewater is treated with acrylonitrile reaction process water. The wastewater contains a large amount of acrylonitrile oligomers, acrylonitrile, cyanide, acetonitrile and other harmful substances. Among them, the pH is 5.64, and the content of hydrocyanic acid is 313.3mg / L. The CODcr is 19985.3mg / L, the ammonia nitrogen content is 332.5mg / L, the color is 4268 degrees, and the turbidity is 232.0NTU.

[0022] A membrane technology integrated treatment method for high-concentration acrylonitrile wastewater, comprising the following steps:

[0023] Step 1): Raw water (115°C) is cooled to 18°C ​​by a high-efficiency plate heat exchanger and enters the raw water tank to stand for standby;

[0024] Step 2): The waste water in the raw water tank is pretreated through a high-efficiency filter, which is used to capture particulate dust and suspended solids below 0.5 μm, and plays a role of security filtration for the subsequent membrane separation unit;

[0025] ...

Embodiment 2

[0030] Acrylonitrile wastewater is treated with acrylonitrile reaction process water, which contains a large amount of acrylonitrile oligomers, acrylonitrile, cyanide, acetonitrile and other harmful substances. Among them, the pH is 5.66, the hydrocyanic acid content is 286.3mg / L, the CODcr is 18966.8mg / L, the ammonia nitrogen content is 332.9mg / L, the color is 3240 degrees, and the turbidity is 335.6NTU.

[0031] A membrane technology integrated treatment method for high-concentration acrylonitrile wastewater, comprising the following steps:

[0032] Step 1): Raw water (115°C) is cooled by high-efficiency plate heat exchanger to 34°C and enters the raw water tank to stand for standby;

[0033] Step 2): The waste water in the raw water tank is pretreated through a high-efficiency filter, which is used to capture particulate dust and suspended solids below 0.5 μm, and plays a role of security filtration for the subsequent membrane separation unit;

[0034] Step 3): filtering t...

Embodiment 3

[0039] Acrylonitrile wastewater is treated with acrylonitrile reaction process water, which contains a large amount of acrylonitrile oligomers, acrylonitrile, cyanide, acetonitrile and other harmful substances. Among them, the pH is 5.84, the hydrocyanic acid content is 299.8 mg / L, the CODcr is 17762.0 mg / L, the ammonia nitrogen content is 326.2 mg / L, the color is 4120 degrees, and the turbidity is 228.0 NTU.

[0040] A membrane technology integrated treatment method for high-concentration acrylonitrile wastewater, comprising the following steps:

[0041] Step 1): Raw water (120°C) is cooled to 32°C through a plate heat exchanger and enters the raw water tank to stand for standby;

[0042] Step 2): The waste water in the raw water tank is pretreated through a high-efficiency filter, which is used to capture particulate dust and suspended solids below 0.5 μm, and plays a role of security filtration for the subsequent membrane separation unit;

[0043] Step 3): passing the pretre...

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Abstract

A membrane technology integrated treatment method for high-concentration acrylonitrile wastewater. Firstly, the acrylonitrile wastewater is cooled by heat exchange through a heat exchanger, and then enters a raw water tank for standby; then the wastewater in the raw water tank is pretreated by a high-efficiency filter, and The pretreated wastewater passes through the microfiltration membrane or ultrafiltration membrane to remove suspended particles, flocs and acrylonitrile oligomers in the wastewater; the acrylonitrile wastewater filtrate enters the nanofiltration system through a booster pump for nanofiltration operation; the obtained The filtrate is installed in a reverse osmosis system for reverse osmosis operation. The present invention can effectively improve the treatment efficiency while reducing the cost of acrylonitrile treatment, and is free from waste water COD Cr High and low restrictions, low energy consumption, easy operation, and small floor space. Compared with the existing technology, it is a low energy consumption, pollution-free, and easy-to-operate acrylonitrile wastewater treatment technology.

Description

technical field [0001] The invention relates to a treatment method for acrylonitrile wastewater, in particular to a membrane technology integrated treatment method for high-concentration acrylonitrile wastewater. Background technique [0002] As one of the important chemical raw materials, acrylonitrile has broad application prospects in the fields of acrylic fiber, nitrile rubber, adiponitrile, acrylamide, ABS resin, synthetic fiber, synthetic rubber, and synthetic plastic production. With my country's accession to the WTO, domestic textile exports have increased year by year, driving the domestic production of acrylonitrile. Since 2000, domestic acrylonitrile production capacity has been increasing at a rate of more than 100,000 tons every year. At present, the production capacity of acrylonitrile is about 1.4 million tons, and every ton of acrylonitrile produced is accompanied by about 1 ton of waste water. With the increasingly stringent requirements of the country for w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F1/44
CPCY02A20/131
Inventor 李继定郑冬菊秦琳蔡卫滨展侠杨正金王涛房满权
Owner TSINGHUA UNIV
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