Depressurized polymerization method and device of semi-aromatic polyamide

A technology of semi-aromatic polyamide and polymerization method, which is applied in the direction of pressure vessels used in chemical processes, etc., which can solve the problems of difficult wastewater treatment, high organic content of condensed waste liquid, and long time consumption, so as to achieve low organic content, reduce processing difficulty, The effect of short polymerization time

Active Publication Date: 2022-07-12
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of flash evaporation avoids the oxidation and degradation of the material at high temperature in the traditional method, and can better maintain the performance of the material; however, the operation of pressure relief and condensation in this method not only takes a long time, but also makes the unreacted Emission of diamine leads to high organic content of condensed waste liquid, making waste water difficult to treat

Method used

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  • Depressurized polymerization method and device of semi-aromatic polyamide

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Experimental program
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Effect test

Embodiment 1

[0075] Carry out depressurization polymerization according to the material ratio of the comparative example, the third reactor volume (V 3 ) is the second reactor volume (V 2 ) 8 times (V 3 =10V 2 ).

[0076] A mixture of terephthalic acid and adipic acid (the molar ratio of terephthalic acid and adipic acid is 50:50) and equimolar hexamethylene diamine, accounting for 60% of the total weight of phthalic acid, adipic acid and hexamethylene diamine The pure water, auxiliaries accounting for 1% of the total weight of terephthalic acid, adipic acid and hexamethylene diamine were put into the first reaction kettle at room temperature, and the temperature was raised to 110 ° C within 2h to prepare a polyamide salt solution. The pressure of the first reactor was 0.13MPaG, and the salt-forming reaction lasted for 1h; the pressure equalization pipeline between the first reactor and the second reactor was opened, and the polyamide salt solution was transferred to the second reactor ...

Embodiment 2

[0078] Carry out depressurization polymerization according to the material ratio of embodiment 1, the third reactor volume (V 3 ) is the second reactor volume (V 2 ) 15 times (V 3 =20V 2 ).

[0079] A mixture of terephthalic acid and adipic acid (the molar ratio of terephthalic acid and adipic acid is 80:20) and equimolar hexamethylene diamine, accounting for 60% of the total weight of phthalic acid, adipic acid and hexamethylene diamine The pure water, auxiliaries accounting for 1% of the total weight of terephthalic acid, adipic acid and hexamethylene diamine were put into the first reaction kettle at room temperature, and the temperature was raised to 150 ° C within 2 hours to prepare a polyamide salt solution. The pressure of the first reaction kettle is 0.5MPaG, and the salt formation reaction lasts for 1h; open the pressure equalization pipeline between the first reaction kettle and the second reaction kettle, transfer the polyamide salt solution to the second reactio...

Embodiment 3

[0081] With reference to Example 1, the mol ratio of terephthalic acid and adipic acid was adjusted to 40:60, and the third reactor volume (V 3 ) is the second reactor volume (V 2 ) 4 times (V 3 =4V 2 ).

[0082] A mixture of terephthalic acid and adipic acid (the molar ratio of terephthalic acid and adipic acid is 40:60) and equimolar hexamethylene diamine, accounting for 60% of the total weight of phthalic acid, adipic acid and hexamethylene diamine The pure water, auxiliaries accounting for 1% of the total weight of terephthalic acid, adipic acid and hexamethylene diamine were put into the first reaction kettle at room temperature, and the temperature was raised to 80 °C within 1 h to prepare a polyamide salt solution. The pressure of the first reactor is 0MPaG, and the salt-forming reaction lasts for 1h; open the pressure equalization pipeline between the first reactor and the second reactor, and transfer the polyamide salt solution to the second reactor preheated to 28...

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Abstract

The present application discloses a method for the polymerization of semi-aromatic polyamides and a device used therefor. The capacity expansion and pressure reduction of the series reaction kettles with pressure equalization pipelines are arranged between them, so that the process route has the advantages of short polymerization time, low organic matter content in the condensed waste liquid, and high reliability. Achieve continuous polymerization and other advantages.

Description

technical field [0001] The present invention generally relates to a method and apparatus for depressurized polymerization of semi-aromatic polyamide, and in particular to a method and device for depressurized polymerization of semi-aromatic polyamide material using a reactor. Background technique [0002] Semi-aromatic polyamide is obtained by polycondensation reaction of aliphatic diamine and aromatic diacid or aromatic diamine and long carbon chain aliphatic diacid. At present, the main varieties of semi-aromatic polyamides are nylon 4T, nylon 46, nylon 6T / 6, nylon 6T / 66, nylon 6T / 6I, nylon 6T / 6I / 66, nylon 9T, nylon 10T, nylon MXD6 and so on. Compared with aliphatic polyamides, the aromatic ring structure is introduced into the main chain of polyamide molecules, so the heat resistance and mechanical properties of polyamide products are improved, and the water absorption rate is also reduced to varying degrees. Compared with fully aromatic polyamide, its molecular main seg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/28C08G69/30C08G69/26B01J3/04
CPCC08G69/28C08G69/30C08G69/265B01J3/04
Inventor 苑先佩刘彪曲振高斌潘现路杨伟翔陈海波
Owner WANHUA CHEM GRP CO LTD
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