Polyphenylene sulfide desalting method

A technology of polyphenylene sulfide and reactor, which is applied in the desalination field of polyphenylene sulfide synthesized by sodium sulfide method, can solve the problems of poor desalination effect, high energy consumption, large amount of solvent, etc., and achieves the convenience of industrial production and Popularization and application, simple equipment, and the effect of simplifying the purification process

Active Publication Date: 2015-02-25
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simple o

Method used

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  • Polyphenylene sulfide desalting method

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Embodiment 1

[0037] After the polyphenylene sulfide synthesis reaction is completed, stop stirring, keep the reaction kettle warm at 220°C, keep the reaction pressure and let it stand for 20 minutes to allow the by-product salt and reaction additives to settle to the bottom of the kettle. After the settlement is over, replace the air in the storage tank with nitrogen before the polyphenylene sulfide solution is moved to the storage tank. After the replacement, the pressure in the storage tank is maintained at 0 MPa; Balanced with tank pressure. Then, the temperature of the polyphenylene sulfide solution in the storage tank was lowered to 150° C., so that the polyphenylene sulfide was precipitated from the reaction solution to form a suspension; the suspension in the storage tank was filtered to obtain a polyphenylene sulfide filter cake. Adding N-methylpyrrolidone into the reaction kettle containing salt, stirring under the conditions of reaction temperature and pressure during polyphenyle...

Embodiment 2

[0039] After the polyphenylene sulfide synthesis reaction is completed, stop stirring, keep the reaction kettle warm at 230° C., keep the reaction pressure and let stand for 35 minutes to allow the by-product salt and reaction additives to settle to the bottom of the kettle. After the settlement is over, replace the air in the storage tank with nitrogen before the polyphenylene sulfide solution is moved to the storage tank. After the replacement, the pressure in the storage tank is maintained at 0 MPa; Balanced with tank pressure. Then, the temperature of the polyphenylene sulfide solution in the storage tank was lowered to 130° C., so that the polyphenylene sulfide was precipitated from the reaction solution to form a suspension; the suspension in the storage tank was filtered to obtain a polyphenylene sulfide filter cake. Adding N-methylpyrrolidone into the reaction kettle containing salt, stirring under the conditions of reaction temperature and pressure during polyphenylen...

Embodiment 3

[0041] After the synthesis reaction of polyphenylene sulfide, the stirring was stopped, and the reaction kettle was kept warm at 240° C., and the reaction pressure was kept for 45 minutes to allow the by-product salt and reaction additives to settle to the bottom of the kettle. After the settlement is over, replace the air in the storage tank with nitrogen before the polyphenylene sulfide solution is moved to the storage tank. After the replacement, the pressure in the storage tank is maintained at 0 MPa; Balanced with tank pressure. Then, the temperature of the polyphenylene sulfide solution in the storage tank was lowered to 120° C., so that the polyphenylene sulfide was precipitated from the reaction solution to form a suspension; the suspension in the storage tank was filtered to obtain a polyphenylene sulfide filter cake. Adding N-methylpyrrolidone into the reaction kettle containing salt, stirring under the conditions of reaction temperature and pressure during polypheny...

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Abstract

The invention discloses a polyphenylene sulfide desalting method. The method comprises the following steps: carrying out temperature and pressure maintenance standing in a reactor after a polyphenylene sulfide synthesis reaction to make inorganic salts and inorganic additives settle to the bottom of the reactor, pumping a polyphenylene sulfide solution out of the reactor by using a pressure difference, cooling the solution, washing the precipitated polyphenylene sulfide product with ethanol and deionized water, and drying the washed polyphenylene sulfide to obtain highly pure polyphenylene sulfide. The method allows most inorganic salts and inorganic additives to be removed from polyphenylene sulfide in the reactor, and simplifies later purifying steps. The method can be implemented in the reactor after the polyphenylene sulfide polymerization reaction, and has the advantages of simple device, safe and convenient technology, saving of a large amount of purifying solvents, and convenient industrial production and popularization application.

Description

technical field [0001] The invention belongs to the production field of polyphenylene sulfide, and in particular relates to a desalting method for synthesizing polyphenylene sulfide by a sodium sulfide method. Background technique [0002] Polyphenylene sulfide is a thermoplastic resin whose molecular main chain is composed of p-phenylene and sulfur atoms. It is known as polycarbonate (PC), polyester (PET), polyoxymethylene (POM), nylon (PA), It is the sixth largest general-purpose engineering plastic after polyphenylene oxide (PPO) and one of the eight largest aerospace materials. Only a few developed countries in the world are able to industrialize production. Polyphenylene sulfide has the characteristics of high temperature resistance, radiation resistance, flame retardancy, low viscosity, high dimensional stability, good solvent resistance and chemical corrosion resistance, excellent dielectric properties and wear resistance. [0003] The industrial synthesis of PPS ma...

Claims

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Application Information

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IPC IPC(8): C08G75/02C08G75/0281
Inventor 付会娟胡楠张志全杨雨强
Owner CHINA PETROLEUM & CHEM CORP
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