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Wastewater treatment method for acrylonitrile production and refining process

A wastewater treatment and acrylonitrile technology, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of complex treatment process, high COD value, high operating cost, etc., and achieve the effect of simple process, thorough removal and low operating cost

Inactive Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, when treating the waste water of the acrylonitrile production and refining system, the treatment process is complex, the operating cost is high, and the COD value in the treated waste water is high. A new acrylonitrile production and refining process is provided. waste water treatment method

Method used

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  • Wastewater treatment method for acrylonitrile production and refining process
  • Wastewater treatment method for acrylonitrile production and refining process

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Embodiment 1～9

[0011] The waste water from the acrylonitrile production and refining system is mixed with the gas containing elemental oxygen and passed through the wet oxidation reactor. The reaction conditions are shown in Table 1. After the reaction, the waste water is cooled to room temperature by a cooler and separated from the gas and liquid. The COD value of the waste water before the reaction and the value after the reaction are analyzed. See Table 2 for the COD value of the water phase after gas-liquid separation.

[0012]

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Abstract

The invention relates to a wastewater treatment method for an acrylonitrile production and refining process, and the method is used for solving the problems that the process for treating the wastewater produced by an acrylonitrile production and refining system is complex, the operation cost is high, and the COD (Chemical Oxygen Demand) value of the treated wastewater is high. According to the technical scheme, the wastewater treatment method for the acrylonitrile production and refining process is characterized by mixing the wastewater generated during refining acrylonitrile produced by propylene or propane ammoxidation and gas containing elemental oxygen under the conditions that the temperature is 200-300 DEG C, the pressure is 4-10MPa and the standing time is 1-200 minutes, and then removing organic substances from wastewater to reach COD value of 1,500mg / l of wastewater. By performing the wastewater treatment method, the problems in the prior art can be better solved; the wastewater treatment method can be applied to wastewater treatment during the acrylonitrile production and refining process.

Description

technical field [0001] The invention relates to a wastewater treatment method in the production and refining process of acrylonitrile. Background technique [0002] Acrylonitrile is an important organic chemical raw material, which is generally produced by the ammoxidation method of propylene or propane. Propylene or propane, ammonia and oxygen pass through the catalyst in the fluidized bed reactor to generate acrylonitrile and by-products such as acetonitrile and hydrocyanic acid. Then enter the recovery and refining system from the fluidized bed reactor to separate and purify acrylonitrile and by-products (USP3936360). [0003] Two types of wastewater are produced during the production of acrylonitrile, among which the COD value of the wastewater produced during the refining process is 10-50 g / l. At present, most of the wastewater in the refining system is concentrated by multi-effect evaporation. The evaporated low-concentration wastewater further reduces the concentrati...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 宋卫林吴粮华汪国军奚美珍
Owner CHINA PETROLEUM & CHEM CORP
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