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Device for preparing polyamide, prepolymerization method, and polyamide production equipment and production method

A production method and polyamide technology, applied in the field of polyamide, can solve problems such as the unsatisfactory temperature control effect of the tubular reactor, the difficulty in controlling the temperature of the reaction mixture, and the limited ability to adjust the temperature, so as to achieve industrial value, expand production and Wide range of applications and less loss of raw materials

Active Publication Date: 2019-05-10
CATHAY R&D CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The continuous polymerization process of polyamide is very sensitive to temperature, and the existing polymerization reactors have limited ability to adjust the temperature, which leads to many problems
First, the heating rate is too high, leading to the formation of polyamide by-products as well as gels, which can clog the system, require shutdown of the reactor and other components for cleaning, and contaminate the polyamide product
Second, when water vapor is formed in the reactor, it will increase the pressure in the reactor and form a mixture of water vapor and the reaction mixture, the increase in pressure causes the water vapor and the reaction mixture to travel along the reactor at a high speed, making it difficult to control the temperature of the reaction mixture, and complicates the separation of water vapor from the reaction mixture
[0006] For the prepolymerization step of the polyamide polymerization process, most of the existing devices or equipment are directed at the prepolymerization device of the polyamide 66 polymerization system, and are not suitable for polyamide 5X. For example, CN 204051644 U discloses a method for Tubular reactor for preparing polyamide, the temperature control effect of this tubular reactor is also not ideal

Method used

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  • Device for preparing polyamide, prepolymerization method, and polyamide production equipment and production method
  • Device for preparing polyamide, prepolymerization method, and polyamide production equipment and production method
  • Device for preparing polyamide, prepolymerization method, and polyamide production equipment and production method

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preparation example Construction

[0103] (1) Preparation of polyamide salt solution

[0104] Under the protection of nitrogen, the high-concentration 1,5-pentanediamine is diluted with degassed deionized water to a certain concentration solution (30%-50%). The aliphatic dibasic acid and the diluted 1,5-pentanediamine are continuously added to the reactor at the same time, and the cooling water removes the heat of reaction during the neutralization reaction in time. During the neutralization process, the pH value of the solution is constantly detected, so that the mol ratio of the diamine / diacid in the reactor is slightly lower than 1. After stabilization, the resulting salt solution is transferred to the reactor in series behind (can be connected in series) multiple units, but generally not more than 3 units), use diamine aqueous solution to further neutralize step by step and adjust the molar ratio of diamine / diacid and the mass concentration of salt, and control the flow of diamine aqueous solution with the ...

Embodiment 1

[0119] Configuration pH is the polyamide 56 salt solution of 65% concentration of 7.95, carries out polymerization by the processing condition of table 1 by the production equipment of the present invention, the pressure of final polymerization tank is 210mmHg A, obtains the slice that relative viscosity is 68.9, and its terminal amino content is 40.4.

Embodiment 2

[0121] Configuration pH is the polyamide 56 salt solution of 65% concentration of 8.05, carries out polymerization according to the process condition of embodiment 1 through the production equipment of the present invention, but the pressure of final polymerization kettle is adjusted to 180mmHg A, and output is higher than embodiment 1 was increased by 20%, and the chips with a relative viscosity of 69.7 and an amino-terminal content of 40.1 were obtained.

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Abstract

The invention provides a prepolymerization device for preparing polyamide. The prepolymerization device comprises a tubular reactor, three or more heating jackets for heating the tubular reactor, and one or more heating medium evaporators for providing a heating medium for the heating jackets. The invention further provides a prepolymerization method and production equipment and a production method of polyamide. The heating and heat transferring efficiency of the prepolymerization device is high, temperature control is more precise, the device operates stably, maintenance and replacement are convenient, and the production cost can be effectively reduced. The production equipment and the production method for polyamide 5X specifically aim at polyamide 5X, polyamide 5X products of multiple types can be produced, and the production and application range of the polyamide 5X products can be widened.

Description

technical field [0001] The invention relates to the field of polyamide, in particular to a device for preparing polyamide, a prepolymerization method, polyamide production equipment including the device, and a polyamide production method. Background technique [0002] In the prior art, polyamide polymerization methods can generally be classified into thermal polycondensation or interfacial polycondensation. For example: (BaconKe, A.W. Sisko, Differential thermal analysis of high polymers. III. Polyamides, Journal of Polymer Science Vol. 50 No. 153, Pages 87-98, March 1961) describes the thermal polycondensation method, however, according to It is reported that the polyamide produced by the heating polycondensation method has a lower melting point and deteriorates heat resistance than the interfacial polycondensation method (J. Polym. Sci. 50, 87, 1961; Macromolecules, 30, 8540, 1998). However, the interfacial polycondensation process is very complicated and difficult to app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/46C08G69/26B01J19/00
CPCY02P20/10
Inventor 秦兵兵郑毅刘驰刘修才
Owner CATHAY R&D CENT CO LTD