Method for processing hyper-saline organic wastewater

A technology of organic waste water and treatment method, which is applied in the field of industrial waste brine treatment and high-salt organic waste water treatment, can solve environmental pollution and other problems, and achieve the effects of low industrial investment cost, reduced raw material consumption, and reduced organic matter content in waste water

Active Publication Date: 2014-04-23
甘肃北方三泰化工有限公司
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Problems solved by technology

[0005] The main technical problem to be solved by the present invention is that after the waste brine produced in the polycarbonate production process is extracted and stripped, most of the useful components are recovered, but it still contains a small amount of phenol, and direct discharge will pollute the environment. Further deal with issues such as discharge after passing the test

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  • Method for processing hyper-saline organic wastewater

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Embodiment 1

[0029] The waste water produced in the production process is 1~3m 3 / h, wherein the dichloromethane content is 1-10%, and the salt content is 5-15%. After the first delivery pump 1, it enters the stripping tower for dichloromethane stripping. The stripping tower is a packed tower, and the filling material is ceramic abalone Pall ring or 316L Pall ring, the thickness of the packing layer is 2-5m, and the spray density is 1-5L / m 3, wherein the gas introduced is water vapor, which enters from the bottom of the tower, and the waste water is sprayed from the top of the tower, and the two are in countercurrent contact, and the water vapor is low-pressure saturated steam. 0.5~0.2MPa, the vaporized dichloromethane enters the condensation recovery system through the gas phase outlet at the top of the tower, and 64kg / h of dichloromethane can be stripped with 200kg / h steam; the dichloromethane solvent is separated statically and returned to the production process to improve The utilizat...

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Abstract

The invention discloses a method for processing hyper-saline organic wastewater. The method comprises the steps of gas stripping, resin absorption and active carbon absorption. The step of gas stripping comprises the steps of feeding wastewater into a polycarbonate producing process into a gas stripping tower, feeding a heating medium into the gas stripping tower to heat the wastewater, vaporizing a dichloromethane in the wastewater to condense and enter a solvent recycling system; the resin absorption step adopts macroporous resin; the active carbon absorption step adopts particle active carbon with a granularity of 10-24 meshes; before the resin absorption step, inorganic acid is added for adjusting pH value of the organic wastewater at 1-6; before the active carbon absorption step, alkaline liquid is added for adjusting pH value of the hyper-saline organic wastewater at 5-9. The method has the characteristics that operation is convenient and reliable and investment cost is low.

Description

technical field [0001] The invention relates to the technical field of industrial waste brine treatment, in particular to the technical field of high-salt organic wastewater treatment produced in the polycarbonate production process. Background technique [0002] Polycarbonate resin (PC for short) prepared by interfacial polycondensation of bisphenol A and phosgene is an engineering plastic with excellent comprehensive properties, with high transparency, excellent impact strength, heat resistance, cold resistance, and dimensional stability And electrical insulation, etc., are widely used for various purposes, such as in the manufacture of automotive parts, optical parts, etc. [0003] The main raw materials for interfacial polycondensation phosgenation are bisphenol A, phosgene, sodium hydroxide solution and phenol as an end-capping agent. During this process, a large amount of waste brine with a NaCl concentration of 5-15% will be produced, and its pH value is generally be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/66C02F1/28C02F101/34
Inventor 崔杨程华农付振波岳金彩边祥成齐国栋马瑞进王啸宇
Owner 甘肃北方三泰化工有限公司
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