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Charging method used in polyphenylene sulfide production

A feeding method and polyphenylene sulfide technology are applied in the feeding field in the production of polyphenylene sulfide, which can solve the problems of prolonging the reaction time, increasing energy consumption and the like, so as to accelerate the dehydration speed, reduce the loss of raw materials and energy consumption, and reduce the heat. Effect

Active Publication Date: 2009-05-13
江苏新任环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although using the above-mentioned feeding method in the production process can effectively prevent the volatilization of p-dichlorobenzene and ensure the ratio of raw materials, the cooling operation not only prolongs the reaction time but also increases energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Stainless steel 180L reaction kettle, add 40.0kg of solvent NMP and start stirring, add 23.40kg of aqueous sodium sulfide and 3.00kg of catalyst in turn, pass in nitrogen to bring out steam, quickly heat up to remove moisture; after dehydration, stop heating, turn off the protective gas, Quickly add 40.0kg of solvent NMP to the reaction kettle, close the valve of the reaction kettle, and open the feeding valve after the temperature is stable. At this time, the temperature has dropped to 170.2°C, add 22.05kg of p-dichlorobenzene, and finally add 20.0kg of solvent NMP, turn on the heating , into the polymerization reaction stage.

Embodiment 2

[0011] Stainless steel 180L reaction kettle, add 30.0kg of solvent NMP and start stirring, add 23.40kg of aqueous sodium sulfide and 3.00kg of catalyst in turn, pass in nitrogen to bring out steam, quickly heat up to remove moisture; after dehydration, stop heating, turn off the protective gas, Quickly add 50.0kg of solvent NMP to the reaction kettle, close the valve of the reaction kettle, and open the feeding valve after the temperature is stable. At this time, the temperature has dropped to 171.8°C, add 22.05kg of p-dichlorobenzene, and finally add 20.0kg of solvent NMP, turn on the heating , into the polymerization reaction stage.

Embodiment 3

[0013] Stainless steel 180L reaction kettle, add 28.0kg of solvent NMP and start stirring, add 15.60kg of aqueous sodium sulfide and 1.50kg of catalyst in turn, pass in nitrogen to bring out steam, quickly heat up to remove moisture; after dehydration, stop heating, turn off the protective gas, Quickly add 28.0kg of solvent NMP to the reaction kettle, close the valve of the reaction kettle, and open the feeding valve after the temperature is stable. At this time, the temperature has dropped to 167.5°C, add 14.70kg of p-dichlorobenzene, and finally add 14.0kg of solvent NMP, turn on the heating , into the polymerization reaction stage.

[0014] During the implementation of the invention, the dehydration process is rapid and the effect is good. After dehydration, the temperature of the system cools down quickly, avoiding the use of cooling water, reducing energy consumption, and no p-dichlorobenzene escapes during the feeding process, and the subsequent polymerization reaction is...

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Abstract

The invention discloses a feeding method in the process of production of polyphenylene sulfide, which guarantees the mixture ratio of materials and simultaneously can reduce energy consumption, shorten the feeding time and guarantee smooth operation of subsequent reaction. The feeding method is characterized in that: firstly, the addition of a solvent is 30 to 40 percent of the total weight of the solvent when the solvent is added into a reaction kettle for the first time; secondly, the residual solvent is added into the reaction kettle after the procedure of temperature rise and dehydration is over, and added until the temperature in the reaction kettle is reduced to be suitable for addition of paradichlorobenzene; and thirdly, the paradichlorobenzene and all the residual solvent are added into the reaction kettle, and the feeding process is over. The feeding method can be widely applied to the process of production of the polyphenylene sulfide.

Description

technical field [0001] The invention relates to a feeding method in the production process of polyphenylene sulfide. Background technique [0002] Polyphenylene sulfide (PPS for short) is a new type of high-performance thermoplastic resin with excellent thermal stability, chemical stability, corrosion resistance and electrical properties. It has a wide range of applications in industry, food, etc., and has a broad market prospect. At present, the main method principle of industrialized production of PPS resin is: using sodium sulfide and p-dichlorobenzene as raw materials, in the presence of solvent N-methyl-2-pyrrolidone (NMP for short), using alkali metal compounds as catalysts, at a certain temperature and Polycondensation under pressure in the system. Hydrous sodium sulfide is generally used in production, so it needs to be heated and dehydrated first. The main process of the above production method is: first add all the required solvent NMP, aqueous sodium sulfide, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/02C08G75/0254
Inventor 陈松张建新丁元尹航胡晓霞
Owner 江苏新任环保科技有限公司
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