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A method for recovering low-molecular polymers in the production process of polyphenylene sulfide

A production process, polyphenylene sulfide technology, applied in the field of polymer engineering, can solve problems such as environmental pollution, increased difficulty and safety risks, and achieve the effect of no pollution to the environment and simple operation

Active Publication Date: 2018-08-14
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because tetrahydrofuran is toxic and introduces new chemical components into the stock solution, it increases the difficulty of production operations and safety risks, and also brings new environmental pollution

Method used

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  • A method for recovering low-molecular polymers in the production process of polyphenylene sulfide
  • A method for recovering low-molecular polymers in the production process of polyphenylene sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 1700Kg of crystalline sodium sulfide pentahydrate, 1430Kg of p-dichlorobenzene, 175Kg of catalyst, and 7000Kg of solvent (2000Kg is used for dissolving p-dichlorobenzene, and 5000Kg is used for dehydration), and polymerize in a reactor. During the polymerization reaction, the pre-polymerization temperature is 225±2°C for 45 minutes, and the polymerization temperature is 265±2°C for 150 minutes. After the polymerization reaction is completed, the temperature of the mixed slurry is cooled to 90° C., and filtered with a continuous centrifuge to obtain filter cake and by-product slurry. Wash the filter cake with 8000Kg deionized water to obtain PPS wet material and washing water, and dry the PPS wet material in a dryer to obtain the finished PPS product. The washing water is mixed with the above-mentioned by-product slurry, and then settled in the settling tank, and the settling time is 30 minutes. The supernatant in the settling tank is filtered with a plate and fra...

Embodiment 2

[0027] Weigh 1500Kg of crystalline sodium sulfide pentahydrate, 1250Kg of p-dichlorobenzene, 165Kg of catalyst, and 5700Kg of solvent (1200Kg is used for dissolving p-dichlorobenzene, and 4500Kg is used for dehydration), and polymerize in a reactor. During the polymerization reaction, the pre-polymerization temperature was 223±2°C for 60 minutes, and the polymerization temperature was 262±2°C for 180 minutes. After the polymerization reaction is completed, the temperature of the mixed slurry is cooled to 80° C., and filtered with a continuous centrifuge to obtain filter cake and by-product slurry. Wash the filter cake with 7500Kg deionized water to obtain PPS wet material and washing water, and dry the PPS wet material in a dryer to obtain the finished PPS product. The washing water is mixed with the above-mentioned by-product slurry, and then settled in the settling tank, and the settling time is 45 minutes. The supernatant in the settling tank is filtered with a plate-and-f...

Embodiment 3

[0029] Weigh 1350Kg of crystalline sodium sulfide pentahydrate, 1230Kg of p-dichlorobenzene, 140Kg of catalyst, and 5500Kg of solvent (1000Kg is used for dissolving p-dichlorobenzene, and 4500Kg is used for dehydration), and polymerize in a reactor. During the polymerization reaction, the pre-polymerization temperature is 225±2°C for 45 minutes, and the polymerization temperature is 265±2°C for 150 minutes. After the polymerization reaction, the temperature of the mixed slurry was cooled to 85° C., and filtered with a continuous centrifuge to obtain filter cake and by-product slurry. Wash the filter cake with 7500Kg deionized water to obtain PPS wet material and washing water, and dry the PPS wet material in a dryer to obtain the finished PPS product. The washing water is mixed with the above-mentioned by-product slurry, and then settled in the settling tank, and the settling time is 60 minutes. The supernatant in the settling tank is filtered with a plate-and-frame filter, t...

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Abstract

The invention belongs to the field of polymer engineering and in particular provides a method for recovering a low molecular polymer in the polyphenylene sulfide (PPS) production process. The method comprises the following steps: filtering mixed slurry obtained through polymerization of PPS resin to obtain filtrate and a filter cake, washing the filter cake with deionized water to obtain washing liquor and a PPS wet material, mixing the washing liquor with the filtrate and then carrying out filtration, acidification, aeration and refiltration, thus obtaining the low molecular polymer. The method can be used for effectively separating and recovering the low molecular polymer generated in the PPS production process and has the effect of reducing environmental pollution.

Description

technical field [0001] The invention belongs to the field of polymer engineering, in particular to a method for recovering low-molecular polymers in the production process of polyphenylene sulfide. Background technique [0002] PPS is a polymer compound with good heat resistance, chemical corrosion resistance and flame retardancy. It can be widely used in special fields such as electronic appliances, automobile manufacturing, food machinery, petrochemical, military and other industries. It is known as Following polycarbonate (PC), polyoxymethylene (POM), polyester (PET), nylon (PA) and polyphenylene oxide (PPO), it is the sixth largest general-purpose engineering plastic and one of the eight major aerospace materials. [0003] The industrial production of PPS mainly adopts the sodium sulfide method. The sodium sulfide method is based on p-dichlorobenzene and crystalline sodium sulfide as synthetic raw materials, with N-methylpyrrolidone (NMP) as the solvent, and under the ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C319/28C07C321/30C08G75/0281
CPCC07C319/28C08G75/02C07C321/30
Inventor 杨永彬颜杰刘建容廖斌刘勇倪浩
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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