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Apparatus for producing polyamide, decompression 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 easy blockage of flash evaporator, unsatisfactory flash evaporation effect, increased viscosity, etc., and achieve good separation effect, industrial value, and sufficient separation effect

Active Publication Date: 2017-12-15
CATHAY R&D CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the above-mentioned flash evaporator is flashing, the concentration of the solution increases continuously, resulting in a continuous increase in viscosity, which is easy to block the flash evaporator, and the flash evaporation effect is not very ideal

Method used

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  • Apparatus for producing polyamide, decompression method, and polyamide production equipment and production method
  • Apparatus for producing polyamide, decompression method, and polyamide production equipment and production method
  • Apparatus for producing polyamide, decompression method, and polyamide production equipment and production method

Examples

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preparation example Construction

[0100] (1) Preparation of polyamide salt solution

[0101] 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

[0116] 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

[0118] Configure the polyamide 56 salt solution with 65% concentration of pH 8.05, and carry out polymerization according to the process conditions of Example 1 through the production equipment of the present invention, but the pressure of the final polymerization tank is adjusted to 180mmHg A, and the output is higher than that of Example 1. 1 was increased by 20%, and a slice with a relative viscosity of 69.7 and an amino-terminal content of 40.1 was obtained.

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Abstract

The invention provides a pressure reducing device for preparing polyamide, comprising a sealed kettle body, the kettle body is provided with a material inlet and a material outlet, the material inlet is located above the material outlet, and the kettle body is provided with a material inlet and a material outlet. The material coil between the outlets is divided into several sections. The diameter of the material coil in the same section is the same, and the diameter of the material coil in different sections increases gradually from the material inlet to the material outlet. The invention also provides a decompression method, and a polyamide 5X production equipment and production method. The decompression device provided by the invention can effectively separate the moisture in the material from the material, and the separation effect is good. The polyamide 5X production equipment and production method provided by the invention are specific to polyamide 5X, can produce polyamide 5X products of various types, and can expand the production and application range of polyamide 5X products.

Description

technical field [0001] The invention relates to the field of polyamide, in particular to a device for preparing polyamide, a decompression 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 apply i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/06C08G69/28
Inventor 秦兵兵郑毅刘驰刘修才
Owner CATHAY R&D CENT CO LTD