Preparation method of nylon 56 salt

A technology of nylon and pentamethylenediamine adipate, which is applied in the field of preparation of nylon 56 salt, can solve the problems of limited industrial production, high product cost, and high environmental protection pressure, and achieve easy operation, improved production efficiency, and increased output Effect

Active Publication Date: 2018-12-28
河北美邦工程科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of nylon 56 salt, to solve the probl...

Method used

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  • Preparation method of nylon 56 salt

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Experimental program
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Effect test

Embodiment 1

[0033] a. In the lysine continuous fermentation and separation integrated system, the pH is controlled between 5.5. With the continuous generation of lysine, the pH in the system will continue to drop. In order to maintain a constant pH environment in the system, the fermentation tank The generated lysine fermentation liquid is filtered through an external inorganic ceramic membrane filter to obtain a primary filtrate of lysine. The bacterial residue is intercepted and then circulated back into the fermenter. With the continuous removal of lysine, new The lysine is continuously generated, and then filtered to realize the continuity of fermentation separation;

[0034] Among them, the lysine continuous fermentation and separation integrated system consists of a lysine fermentation tank, a circulation pump installed on the external circulation pipeline of the tank, and an external inorganic ceramic membrane filter;

[0035] The filtration accuracy of the external inorganic ceram...

Embodiment 2

[0049] a. In the lysine continuous fermentation and separation integrated system, the pH is controlled at 6. With the continuous generation of lysine, the pH in the system will continue to decrease. In order to maintain a constant pH environment in the system, the pH generated in the fermenter The lysine fermentation broth is filtered through an external inorganic metal membrane filter to obtain the primary filtrate of lysine. The bacterial residue is intercepted and then circulated back to the fermenter. With the continuous removal of lysine, the new lysine in the fermenter Amino acid is continuously generated, and then filtered to realize the continuity of fermentation separation;

[0050] Among them, the lysine continuous fermentation and separation integrated system consists of a lysine fermentation tank, a circulation pump on the external circulation pipeline of the tank, and an external inorganic metal membrane filter;

[0051] The filtration accuracy of the external ino...

Embodiment 3~4

[0064] Embodiment 3~4, comparative example 1~2

[0065] The current density and temperature of the two-chamber bipolar membrane electrodialysis device were changed (see Table 1 for details), and other conditions were the same as in Example 1. The test results are shown in Table 1.

[0066] Table 1:

[0067]

[0068] As can be seen from Table 1, under the specific current density and temperature conditions of the present invention, the obtained product can be guaranteed to have higher purity and yield. Beyond the current density and temperature ranges defined by the present invention, the product purity and yield are significantly reduced.

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Abstract

The invention provides a preparation method of nylon 56 salt. The preparation method comprises the following steps: a, performing continuous fermentation and separation of lysine in a lysine continuous fermentation and separation integrated system to obtain a lysine primary filtrate; b, adopting an inorganic ultrafiltration membrane filtration system to remove impurities from the lysine primary filtrate to obtain a lysine secondary filtrate; c, desalting the lysine filtrate by a two-chamber bipolar membrane electrodialysis device; d, then sending a lysine aqueous solution into a continuous enzyme reaction and separation integrated system, adding adipic acid to adjust pH, and simultaneously adding lysine decarboxylase and vitamin B6 coenzyme for decarboxylation reaction; e, adopting macroporous adsorption resin to selectively adsorb the vitamin B6 coenzyme; f, adopting activated carbon for continuous adsorption and decolorization; g, performing concentrating under reduced pressure, crystallizing, separating and drying to obtain a 1,5-pentanediamine adipate product. The preparation method has the advantages of low cost, low environmental protection pressure and high product purity, and is suitable for industrial application.

Description

technical field [0001] The invention relates to the technical field of organic chemistry, in particular to a preparation method of nylon 56 salt. Background technique [0002] Nylon 56 salt, namely 1,5-pentamethylenediamine adipate, is a monomer for the production of nylon 56 polymer polyamide. The raw material of nylon 56 salt, 1,5-pentanediamine, can be converted from lysine through bioengineering, while the raw materials of traditional nylon polyamides (such as nylon 6, nylon 66, etc.) are obtained through petroleum cracking. The shortage of petroleum resources and the serious environmental pollution in the production process are becoming more and more unacceptable to people. The production of nylon 56 salt reduces the dependence on petroleum and is more environmentally friendly. It is a new process with research and application value at home and abroad. In addition, nylon 56 has excellent heat resistance, excellent chemical corrosion resistance and excellent mechanical ...

Claims

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Application Information

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IPC IPC(8): C12P13/00
CPCC12P13/001
Inventor 刘东闫利军卢远峰魏朝帅张玉妹高文杲张玉新金作宏刘永英李彦欣
Owner 河北美邦工程科技股份有限公司
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