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Recovery method of polyphenylene sulfide byproduct salt

The technology of a polyphenylene sulfide and a recovery method is applied in the recovery and treatment of by-product salt sodium chloride, and the recovery field of polyphenylene sulfide by-product salt, which can solve the problem that the purity of sodium chloride needs to be further improved, the equipment requirements are high, and the calcination The problem of high temperature, to achieve the effect of reducing unfriendly emissions, low equipment requirements, and easy collection

Pending Publication Date: 2020-08-25
四川明道和化学新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcination temperature of this method is high, and the requirements for equipment are high, and more tail gas and decomposition products will be produced by high-temperature calcination.
[0009] In summary, the existing methods for recovering polyphenylene sulfide by-product sodium chloride salt are cumbersome and have high requirements for equipment, and the purity of the obtained sodium chloride needs to be further improved.

Method used

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  • Recovery method of polyphenylene sulfide byproduct salt
  • Recovery method of polyphenylene sulfide byproduct salt
  • Recovery method of polyphenylene sulfide byproduct salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add 100 kg of the above-mentioned by-product salt into an electrically heated rotary retort furnace and heat up to 350° C., and maintain it for 3 hours under a vacuum of -0.097 MPa, release and cool to obtain 96 kg of sodium chloride containing black impurities. Take 100g from it and put it into 300ml water to dissolve, then filter through a microporous filter to obtain a colorless filtrate, i.e. brine, through the detection of SS, ammonia nitrogen and COD of this colorless filtrate, it is 9mg / l respectively , 2mg / l, 3mg / l, through this solution is carried out evaporative crystallization completely, the sodium chloride crystal that obtains 95.041g is colorless, and sodium chloride content is 99.83%, see Table 1 for details.

Embodiment 2

[0051] Add 100 kg of the above-mentioned by-product salt into an electric heating rotary retort furnace and heat up to 450° C., vacuum degree -0.097 MPa, maintain for 1.5 hours, release and cool to obtain 96.3 kg of sodium chloride with black impurities. Take 100g from it and put it into 300ml water to dissolve, then filter through a microporous filter to obtain a colorless filtrate, i.e. brine, through the detection of SS, ammonia nitrogen and COD of this colorless filtrate, it is 2mg / l respectively , 1mg / l, 7mg / l, through this solution is carried out evaporative crystallization completely, the sodium chloride crystal that obtains 95.043g is colorless, and sodium chloride content is 99.85%, see Table 1 for details.

Embodiment 3

[0053] Add 100 kg of the above-mentioned by-product salt into the electric heating rotary retort furnace and heat up to 500° C., under the condition of vacuum degree -0.095 MPa, keep it for 1.5 hours, release and cool to obtain 95.9 kg of sodium chloride with black impurities. Take 100g from it and put it into 300ml water to dissolve, then filter through a microporous filter to obtain a colorless filtrate, i.e. brine, through the detection of SS, ammonia nitrogen and COD of this colorless filtrate, it is 8mg / l respectively , 2mg / l, 5mg / l, through this solution is carried out evaporative crystallization completely, the sodium chloride crystal that obtains 95.042g is colorless sodium chloride content 99.83%, see table 1 for details.

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Abstract

The invention relates to a recovery method of polyphenylene sulfide byproduct salt, in particular to recovery treatment of byproduct salt sodium chloride in industrial production of polyphenylene sulfide resin, and belongs to the technical field of three-waste treatment. The technical problem to be solved by the invention is to provide a simple-process recovery method of polyphenylene sulfide byproduct salt, which comprises the following steps: putting polyphenylene sulfide byproduct salt in vacuum, keeping at 300-500 DEG C for 1.5-3 hours, adding water to dissolve the salt, and filtering by using a microporous filter to obtain a sodium chloride solution. According to the method, a vacuum dry distillation method is adopted, little tail gas is generated, the generated tail gas is easy to collect, advanced oxidation deodorization is conveniently adopted, environment-unfriendly emission is reduced, the produced sodium chloride solution is low in SS, NH3-N and COD and colorless, and pure salt can be obtained by evaporating and crystallizing the sodium chloride solution. The method is short in process, simple to operate and low in equipment requirement, and has the characteristics of low cost and low temperature.

Description

technical field [0001] The invention relates to a method for recovering polyphenylene sulfide by-product salt, in particular to the recovery and treatment of by-product salt sodium chloride in the industrial production of polyphenylene sulfide resin, and belongs to the technical field of three wastes treatment. Background technique [0002] Polyphenylene sulfide (hereinafter abbreviated as PPS) is an engineering plastic having excellent heat resistance, chemical resistance, flame retardancy, mechanical strength, electrical characteristics, dimensional stability, and the like. PPS can be processed into various molded products, films, plates, fibers, etc. because it can be processed by general melt processing methods such as extrusion molding, injection molding, and compression molding. It is widely used in electrical, electronic equipment, automotive equipment, etc. in the field. [0003] A typical production method for producing PPS is a method of reacting a sulfur source a...

Claims

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Application Information

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IPC IPC(8): C08G75/0281
CPCC08G75/0281
Inventor 李勇梁平
Owner 四川明道和化学新材料有限公司
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