High-concentration acrylonitrile wastewater treatment method

A technology of acrylonitrile wastewater and treatment method, which is applied in multi-stage water treatment, natural water treatment, heating water/sewage treatment and other directions, can solve the problems of up-to-standard discharge, biochemical treatment, insufficient recovery of acrylonitrile, etc., and achieve considerable economic benefits , The process is simple and energy-saving, and the effect of reducing risks

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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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

Method used

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  • High-concentration acrylonitrile wastewater treatment method

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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 high-concentration acrylonitrile wastewater treatment method. The method comprises the following steps: blowing off high-concentration acrylonitrile wastewater to obtain wastewater with the acrylonitrile concentration of below 1mg/L, and directly carrying out biochemical treatment; carrying out gas-liquid separation on the obtained blown mist gas to obtain a separated gas with the acrylonitrile concentration of 0.1mg/Nm<3> and reaching emission requirements; and carrying out azeotropic rectification and rectification treatment on the obtained separated liquid to obtain an acrylonitrile product with the purity of above 99%. The method allows acrylonitrile in the wastewater to be thoroughly separated and recovered, reduces harms of the acrylonitrile wastewater to the environment, and realizes a remarkable economic benefit.

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 Applications(China)
IPC IPC(8): C02F9/14B01D50/00C07C253/34C07C255/08C02F1/20C02F1/04C02F103/36
CPCC02F9/00B01D50/00C02F1/04C02F1/20C02F2101/34C02F2103/36C02F2301/08C07C253/34C07C255/08
Inventor 罗继红王岽张建新单薇吴颖
Owner CHINA PETROLEUM & CHEM CORP
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