A kind of treatment method of high concentration acrylonitrile wastewater

A technology for acrylonitrile wastewater and its treatment method, which is applied in natural water treatment, heating water/sewage treatment, degassed water/sewage treatment, etc. It can solve the problems of standard discharge, biochemical treatment, insufficient recovery of acrylonitrile, etc., and achieve reduction The effect of low risk, simple and energy-saving process, and considerable economic benefits

Active Publication Date: 2016-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problems that the concentration of acrylonitrile production wastewater in the chemical fiber industry is too high, it cannot be directly biochemically treated and discharged up to the standard, and the acrylonitrile is not fully recovered, the present invention proposes a treatment method for the separation and recovery of high-concentration acrylonitrile wastewater, which is effective Recover acrylonitrile materials in wastewater, and as a pretreatment process for biochemical treatment of acrylonitrile wastewater, wastewater can be discharged up to standard after biochemical treatment

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  • A kind of treatment method of high concentration acrylonitrile wastewater

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Embodiment 1

[0034] A high-concentration acrylonitrile wastewater, the feed rate is 1000kg / h, and the content of acrylonitrile is 0.1wt%.

[0035] The acrylonitrile waste water 1 enters the upper part of the stripping tower C1, and the fractionation tower is a packed tower, and the filler is IMTP40# bulk packing, the packing height is 5 meters, and the compressed air 2 is fed from the bottom of the stripping tower C1, the flow rate is 290kg / h, and the air pressure 0.2MPa (absolute pressure), the effluent after removing acrylonitrile is discharged from the bottom of the C1 tower, the content of acrylonitrile in the effluent is 1mg / L, and the flow rate of the effluent is 995kg / h. The mist material entrained with acrylonitrile and water at the top of the C1 tower enters the gas-liquid separator V1. In the gas-liquid separation, it passes through the two-stage gas-liquid separation of the double-bag blade separator and the wire mesh demister respectively. The gas phase at the top is used as Ve...

Embodiment 2

[0039] A high-concentration acrylonitrile wastewater, the feed rate is 5000kg / h, and the content of acrylonitrile is 0.5wt%.

[0040] The acrylonitrile waste water 1 enters the upper part of stripping tower C1, and the fractionating tower is a packed tower. The filler is Pall ring bulk packing, and the packing height is 10 meters. 0.2MPa (absolute pressure), the effluent after removing acrylonitrile is discharged from the bottom of the C1 tower, the acrylonitrile content of the effluent is 0.6mg / L, and the effluent flow rate is 4936.5kg / h. The mist material entrained with acrylonitrile and water at the top of the C1 tower enters the gas-liquid separator V1. In the gas-liquid separation, it passes through the two-stage gas-liquid separation of the double-bag blade separator and the wire mesh demister respectively. The gas phase at the top is used as The air is vented, the substrate discharge is acrylonitrile aqueous solution, the acrylonitrile content is 76.5%, and the output i...

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Abstract

The invention provides a treatment method for high-concentration acrylonitrile wastewater. In this method, high-concentration acrylonitrile wastewater is firstly blown off. After blowing off, the concentration of acrylonitrile in the wastewater is less than 1mg / L, and subsequent biochemical treatment can be directly performed; then, the gas-liquid separation is carried out on the mist gas blown out, and the propylene in the gas is separated. Nitrile concentration is less than 0.1mg / Nm 3 , to meet the discharge requirements; the separated liquid is subjected to azeotropic rectification and rectification treatment to obtain acrylonitrile products with a purity greater than 99%. The method can relatively thoroughly separate and recover the acrylonitrile in the waste water, not only reduces the harm of the acrylonitrile waste water to the environment, but also obtains remarkable economic benefits.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for treating high-concentration acrylonitrile waste water. Background technique [0002] Acrylonitrile is an important organic chemical raw material, mainly used in the production of acrylic fiber, ABS / SAN resin, acrylamide, polyether and nitrile rubber and other products. It is a propylene derivative second only to polypropylene, and about 7% of the world's propylene is used to produce acrylonitrile. In recent years, with the rapid increase in the demand for downstream products such as acrylic fiber and ABS resin, the domestic consumption of acrylonitrile has increased significantly. At the same time, the domestic production capacity of acrylonitrile is also continuously increasing, and new facilities have been put into operation one after another. [0003] Acrylonitrile is a highly toxic substance, which has strong irritation and damage to the respiratory system, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14B01D50/00C07C253/34C07C255/08C02F1/20C02F1/04C02F103/36
Inventor 罗继红王岽张建新单薇吴颖
Owner CHINA PETROLEUM & CHEM CORP
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