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Nylon 5X salt and high-purity preparation method thereof

A nylon, step method technology, applied in the field of high-purity nylon 5X salt, can solve the problems of high production cost, complex process, difficult handling, etc., and achieve the effect of reducing loss and pollution, and simple process

Active Publication Date: 2018-06-08
SHANDONG SHOUGUANG JUNENG GOLDEN CORN CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This process has the following disadvantages: 1. A large amount of by-product sodium sulfate or sodium chloride is generated, which is not easy to handle; 2. The yield of pentamethylenediamine is low during rectification; 3. Pentylenediamine is corrosive to a certain extent and damages equipment Serious; 4. Pentamethylenediamine has a special smell, and the separation and purification of Pentamethylenediamine will have a serious impact on the environment; 5. The amount of waste water is large, and at the same time, the waste water contains Pentamethylenediamine, which needs to be decomposed and reused after resin adsorption, and the resin adsorption rate is low , the adsorption rate is about 90%. Sulfuric acid and caustic soda are needed for analysis, which produces a large amount of high-salt wastewater; 6. The process is complicated, the process route is long, and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The one-step production technique of nylon 54 salt, comprises the steps:

[0036] (1) The lysine fermentation liquid produced in the production process of L-lysine hydrochloride is subjected to ion exchange adsorption and analysis to obtain pure lysine collection liquid, and after deamination, use nanofiltration membrane to separate part of the protein and inorganic salts; use succinic acid and lysine to react to generate lysine succinate solution, and control the reaction pH between 5 and 6;

[0037] (2) Add the lysine decarboxylase fermentation broth that has been cultivated to the lysine succinate solution that has been processed in step (1), and the addition of the lysine decarboxylase fermentation broth is lysine succinate 5% of

[0038] (3) The pH of the conversion process is controlled to 7.2, and VB6 is added to increase the conversion rate. Controlled by adding succinic acid solids, it is converted into pentamethylenediamine succinate. During the conversion pr...

Embodiment 2

[0045] The one-step production technique of nylon 54 salt, comprises the steps:

[0046] (1) The lysine fermentation liquid produced in the production process of L-lysine hydrochloride is subjected to ion exchange adsorption and analysis to obtain pure lysine collection liquid, and after deamination, use nanofiltration membrane to separate part of the protein and inorganic salts; use succinic acid and lysine to react to generate lysine succinate solution, and control the reaction pH between 5 and 6;

[0047] (2) Add the lysine decarboxylase fermentation broth that has been cultivated to the lysine succinate solution that has been processed in step (1), and the addition of the lysine decarboxylase fermentation broth is lysine succinate 5% of

[0048] (3) The pH of the conversion process is controlled to 7.4, and VB6 is added to increase the conversion rate. Controlled by adding succinic acid solids, it is converted into pentamethylenediamine succinate. During the conversion pr...

Embodiment 3

[0055] The one-step production technique of nylon 54 salt, comprises the steps:

[0056] (1) The lysine fermentation liquid produced in the production process of L-lysine hydrochloride is subjected to ion exchange adsorption and analysis to obtain pure lysine collection liquid, and after deamination, use nanofiltration membrane to separate part of the protein and inorganic salts; use succinic acid and lysine to react to generate lysine succinate solution, and control the reaction pH between 5 and 6;

[0057] (2) Add the lysine decarboxylase fermentation broth that has been cultivated to the lysine succinate solution that has been processed in step (1), and the addition of the lysine decarboxylase fermentation broth is lysine succinate 5% of

[0058] The lysine decarboxylase (abbreviated as LDC, EC4.1.1.18) used in the present invention is an enzyme that can convert lysine into 1,5-pentanediamine. It is not particularly limited and can be derived from known biological enzymes....

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Abstract

The invention discloses a one-step production process of nylon 5X salt and the prepared high-purity nylon 5X salt. The one-step production process of the nylon 5X salt comprises the steps of carryingout ion exchange adsorption and desorption on a lysine fermentation fluid, obtaining a pure lysine collecting fluid, and after deaminizing, using a nanofiltration membrane for separating part of protein and inorganic salt; utilizing binary acid and lysine for reacting to generate lysine binary acid salt, controlling reaction PH to range from 5 to 6, during a conversion process, directly adding thebinary acid for buffering pH, utilizing a lysine decarboxylase fermentation fluid for one-step converting the lysine binary acid salt into a nylon 5X salt solution, and controlling PH after finishingconversion to be around 7; after filtering and sterilizing through a ceramic membrane, adsorbing impurities, concentrating, crystallizing, extracting and crystallizing a mother liquor through ethyl alcohol after crystallizing, and collecting the nylon 5X salt. The yield and the purity are improved, and the production pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of nylon 5X salt production, in particular to a one-step production process of nylon 5X salt and a method for preparing high-purity nylon 5X salt. Background technique [0002] With the rapid development of the economy, the global demand for polyamide polyurethane and other polymer products is increasing year by year. 1,5-pentamethylenediamine is an important monomer for the synthesis of polyamide and other polymers. Currently, nylon 5X salt It is mainly through the decarboxylation of lysine sulfate or lysine hydrochloride solution by lysine decarboxylase. During the conversion process, sulfuric acid buffers the pH to generate 1,5 pentamethylenediamine sulfate, and then precipitates sodium sulfate or chlorine by adding alkali Sodium chloride, separation of 1,5 pentamethylenediamine, pentamethylenediamine reacts with dibasic acid to generate nylon 5X salt. [0003] This process has the following disadvantage...

Claims

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Application Information

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IPC IPC(8): C07C211/09C07C209/84C07C55/10C07C51/41C07C51/43C07C227/40C07C227/16C07C229/26C12P13/00
CPCC07C51/412C07C51/43C07C55/10C07C209/84C07C211/09C07C227/16C07C227/40C12P13/001C07C229/26
Inventor 高世军吴泽华伦学宁刘春华张杰褚玉强王志强孙敬善
Owner SHANDONG SHOUGUANG JUNENG GOLDEN CORN CO LTD
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