Apparatus for preparing polyamide, pressure reducing method as well as production equipment and production method for polyamide

A production method and production equipment technology, applied in the field of polyamide, can solve problems such as increased viscosity, easy blockage of flasher, and unsatisfactory flashing effect, and achieve sufficient separation, good separation effect, and industrial value

Active Publication Date: 2015-11-04
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 preparing polyamide, pressure reducing method as well as production equipment and production method for polyamide
  • Apparatus for preparing polyamide, pressure reducing method as well as production equipment and production method for polyamide
  • Apparatus for preparing polyamide, pressure reducing method as well as production equipment and production method for polyamide

Examples

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Effect test

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 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 present invention provides a pressure reducing apparatus for preparing polyamide.The pressure reducing apparatus comprises a sealed kettle body. The kettle body is provided with a material inlet and a material outlet, wherein the material inlet is formed above the material outlet; inside the reactor body is provided with a material coil connected with the material inlet and the material outlet; the material coil is divided into a plurality of sections; the diameters of the same sections of the material coil are the same; the diameters of different sections of the material coil are gradually increased from the material inlet to the material outlet. The present invention further provides a pressure reducing method as well as production equipment and a production method for polyamide 5X. The pressure reducing apparatus provided by the present invention is capable of effectively separating water from a material, and is good in separation effect. The production equipment and the production method for polyamide 5X provided by the present invention are specific to polyamide 5X, are capable of producing many types of polyamide 5X products, and can broaden the production and application ranges of the 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: (Bacon Ke, A.W. Sisko, Differential thermal analysis of high polymers. III. Polyamides, Journal of Polymer Science Vol. 50 No. 153, pp. 87-98, March 1961) describes a heat polycondensation method, however, According to reports, compared with the interfacial polycondensation method, the polyamide produced by the heating polycondensation method has a lower melting point and poor heat resistance (J. Polym. Sci. 50, 87, 1961; Macromolecules, 30, 8540, 1998). However, the interfacial polycondensation process is very complicated and difficult to apply in industry. Th...

Claims

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Application Information

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Patent Type & Authority Applications(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
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