Crystal type polymer synthesis solvent recovery method and polyphenylene sulfide production method

A recovery method and production method technology, applied in the field of polymer materials, can solve the problems of limited resin application range, difficult separation of mixing, and low product purity, and achieve the effects of ensuring purity and performance, reducing energy consumption, and overcoming low purity.

Active Publication Date: 2015-08-05
广州力牧实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are three problems with this method: first, there will be a large amount of solvent remaining in the filter cake, and the rectification and recovery after washing with water will consume a lot of energy; second, the mother liquor separated from the filter cake after washing with water contains both solvent and by-products Salt, the mixture of the three is difficult to separate; the third is that the product particles are large and uneven, and the catalyst and by-products used for synthesis are still wrapped in the polymer and it is difficult to purify, resulting in low purity of the product, which limits the application range of the resin
[0006] In view of the above shortcomings, in the production process of polyphenylene sulfide, there is an urgent need for an efficient recovery method for the solvent after the synthesis of crystalline polymers and a method for easy purification of the product, so as to solve the solvent loss in the current industrial production process of polyphenylene sulfide Big, high production energy consumption

Method used

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  • Crystal type polymer synthesis solvent recovery method and polyphenylene sulfide production method
  • Crystal type polymer synthesis solvent recovery method and polyphenylene sulfide production method
  • Crystal type polymer synthesis solvent recovery method and polyphenylene sulfide production method

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Embodiment 1

[0060] Prepare raw materials according to the molar ratio of raw materials: p-dichlorobenzene: sodium polyhydrate: lithium chloride: N-methylpyrrolidone = 1: 1: 0.3: 7. The production solvent N-methylpyrrolidone of polyphenylene sulfide resin, the raw material sodium polyhydrate, and the catalyst lithium chloride were successively put into the polymerization kettle, and the temperature was raised to 200°C under nitrogen protection to dissolve and dehydrate sodium polyhydrate for 2 hours. Then cool down to 165°C and add the raw material p-dichlorobenzene, heat up to the polymerization temperature of 260°C, keep the pressure in the kettle at about 1.1MPa, avoid violent temperature fluctuations through the cooling coil, and open the connection between the polymerization kettle and the flash tank after 3 hours of polymerization reaction After the pressure is balanced, put all the materials into the flash tank, turn on the stirring and vacuum system, keep the temperature of the flas...

Embodiment 2

[0066] Prepare raw materials according to the molar ratio of raw materials: p-dichlorobenzene: sodium polyhydrate: lithium chloride: N-methylpyrrolidone = 1: 1: 0.3: 8. The production solvent N-methylpyrrolidone of polyphenylene sulfide resin, the raw material sodium polyhydrate, and the catalyst lithium chloride were successively put into the polymerization kettle, and the temperature was raised to 200°C under nitrogen protection to dissolve and dehydrate sodium polyhydrate for 2.5 hours. Then cool down to 165°C and add the raw material p-dichlorobenzene, heat up to the polymerization temperature of 270°C, keep the pressure in the kettle at about 1.1MPa, avoid violent temperature fluctuations through the cooling coil, and open the connection between the polymerization kettle and the flash tank after 4 hours of polymerization reaction After the pressure is balanced, put all the materials into the flash tank, turn on the stirring and vacuum system, keep the temperature of the fl...

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Abstract

The invention relates to a crystal type polymer synthesis solvent recovery method and a polyphenylene sulfide production method and belongs to the field of polymer materials. The crystal type polymer synthesis solvent recovery method includes the steps of firstly, performing flash evaporation on reaction liquid under a stirring, negative pressure and heating state after solution polymerization reaction is completed so as to recycle solvent; secondly, washing and drying powder products after solvent recycling to obtain crystal type polymer materials. Compared with the prior art, the crystal type polymer synthesis solvent recovery method has the advantages that the problem that solvent recovery in an existing crystal type polymer production process is high in energy consumption and high in loss, the problem of low polymer product purity caused by the fact that inorganic salt particles wrapped by product particles in a traditional process are not cleaned, a new solvent recovery method is provided to the polymer field, and a production flow is simplified.

Description

technical field [0001] The invention relates to a method for recovering a crystalline polymer synthesis solvent and a production method for polyphenylene sulfide, belonging to the field of polymer materials. Background technique [0002] In the field of polymer materials, crystalline state is one of the main forms of polymer condensed state. The regularly arranged area of ​​crystalline polymer polymer is called crystal area, and the disordered area is called amorphous area. The percentage of crystal area is called is the crystallinity. Common crystalline polymer materials mainly include polyethylene, polystyrene, polytetrafluoroethylene, polyphenylene sulfide, etc. [0003] Among them, polyphenylene sulfide (PPS) is a new type of crystalline polymer material with excellent comprehensive properties. In terms of structure, PPS has high strength and modulus and good dimensional stability due to the extremely dense benzene rings and sulfur atoms on the main bond, and also has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/02C08G75/02
Inventor 冷枫钟家春
Owner 广州力牧实业有限公司
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