Method for processing industrial wastewater of polytetrafluoroethylene dispersion resins

A technology of polytetrafluoroethylene and dispersed resin, which is applied in natural water treatment, flotation water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of incomplete collection, easy-to-carry dispersed resin, and suspended solids content High-level problems, to achieve the effect of convenient industrial operation, significant economic and social benefits, and good recycling

Active Publication Date: 2011-11-23
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, part of the precipitated resin floats on the surface of the mother liquor, and part of it settles at the bottom, and the collection is not complete. Dispersed resin is easily carried in the discharged wastewater, and the content of suspended solids (SS) in the wastewater is relatively high.

Method used

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  • Method for processing industrial wastewater of polytetrafluoroethylene dispersion resins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The polytetrafluoroethylene dispersed wastewater with a solid content of 0.5% enters the dissolved air flotation machine at a constant speed of 5t / h, and the air is sent to the pressure dissolved air tank through the compressor, the pressure is controlled at 0.5MPa, and then enters the air flotation tank suddenly Reduce the dissolved air pressure to normal pressure, and the air dissolved in the waste water is separated out to form a large number of dense microbubbles. At the same time, a 20% mass concentration of polyaluminum chloride solution and Disperse and mix the waste water, make the waste water demulsify and separate out the resin, and form flocculent solid under the action of polyaluminum chloride, the microbubbles are adsorbed on the surface of the flocculent solid during the slow rising process, bringing the flocculent solid to the surface of the waste water, and the resin is released The waste water is discharged from the bottom of the air flotation machine. ...

Embodiment 2

[0020] The polytetrafluoroethylene dispersed wastewater with a solid content of 0.2% enters the dissolved air flotation machine at a constant speed of 5t / h, the pressure of the dissolved air system is 0.8MPa, and the polyferric sulfate with a content of 10% is added at a rate of 25kg / h by a pump The air flotation machine is mixed with the dispersed wastewater. The precipitated dispersed resin enters the storage tank under the scraper collection, and is pumped into the plate and frame filter for filtration. The filter cake is taken out and dried to obtain a polytetrafluoroethylene dispersion resin. Others are with embodiment 1.

Embodiment 3

[0022] The polytetrafluoroethylene dispersed wastewater with a solid content of 0.25% enters the dissolved air flotation machine at a constant speed of 5t / h, the pressure of the dissolved air system is 0.6MPa, and the aluminum potassium sulfate with a content of 12% is added at a speed of 25kg / h by a pump The air flotation machine is mixed with the dispersed wastewater. The precipitated dispersed resin enters the storage tank under the scraper collection, and is pumped into the plate and frame filter for filtration. The filter cake is taken out and dried to obtain a polytetrafluoroethylene dispersion resin. Others are with embodiment 1.

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Abstract

The invention relates to a method for processing industrial wastewater of polytetrafluoroethylene dispersion resins, belonging to the processing technology of industrial wastewater. Industrial wastewater of polytetrafluoroethylene dispersion resins is transmitted to a dissolved gas flotation machine; air is sent to a pressure air dissolving tank via a compressor, and the pressure is controlled to 0.5-1.0Mpa; then, the air enters an air flotation water tank, and the dissolved gas pressure is suddenly lowered to normal pressure; air dissolved in the wastewater is separated out to form a great quantity of compact microscopic bubbles; meanwhile, 5-50wt% of salt with a flocculation action is added into a water tank to cause the wastewater to break the emulsion to separate out the resins; under the action of salt, a flocculent solid is formed; the microscopic bubbles are adsorbed to the surface of the flocculent solid in the slowly-rising process; the flocculent solid is taken to the surface of the wastewater; and the wastewater of which the resins are separated out is discharged from the bottom of the flotation machine. According to the method, wastewater emission conforms to requirements, environment is protected, and the dispersion resins can be better recovered, thus waste material is changed into things of value.

Description

technical field [0001] The invention relates to a treatment method for polytetrafluoroethylene dispersed resin production wastewater, which belongs to the industrial wastewater treatment technology. Background technique [0002] Polytetrafluoroethylene dispersion resin is the polymerization of tetrafluoroethylene monomer at the interface formed by the dispersant. The dispersant is generally ammonium perfluorooctanoate. After the polymerization is completed, it will be demulsified after post-treatment to form polytetrafluoroethylene dispersion resin. The condensed mother liquor will be used as production wastewater Drain. The discharged waste water contains the dispersant ammonium perfluorooctanoate and 0.1%-1% unbroken polytetrafluoroethylene emulsion particles. This not only affects the up-to-standard discharge of wastewater and pollutes the environment, but also increases production costs due to the loss of a large amount of unbroken resin. [0003] There are few reports...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/24C02F1/52C08J11/06C08L27/18C02F103/38
CPCY02W30/62
Inventor 夏俊田玉春于东炎
Owner SHANDONG DONGYUE POLYMER MATERIAL
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