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A kind of nylon 5x salt and preparation method thereof

A nylon and production method technology, applied in the field of prepared nylon 5X salt, can solve the problems of long method route, high production cost, low yield of pentamethylenediamine, etc., and achieve the effects of simple method, reduced loss and pollution

Active Publication Date: 2020-06-30
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 method has the following disadvantages: 1. A large amount of by-product sodium sulfate or sodium chloride is generated, which is difficult to handle; 2. The yield of pentamethylenediamine is low during distillation; 3. pentamethylenediamine is corrosive to a certain extent and damages equipment Serious; 4. Pentamethylenediamine has a special smell, which will have a serious impact on the environment when it is separated and purified; 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 method is complicated, the method 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 method production method 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 conversio...

Embodiment 2

[0045] The one-step method production method 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 conversio...

Embodiment 3

[0055] The one-step method production method 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 enzy...

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Abstract

Disclosed in the present invention are a one-step process for producing a nylon 5X salt and a prepared high-purity nylon 5X salt. The process comprises: subjecting a lysine fermentation liquid to ion exchange and desorption to obtain a pure lysine collecting liquid, subjecting same to deamination, and using a nanofiltration membrane to separate part of proteins and inorganic salts; reacting a diacid with lysine to produce a lysine-diacid salt, controlling the reaction pH to be between 5 and 6, directly adding a diacid to buffer pH during the conversion process, converting the lysine-diacid salt feedstock liquid into a nylon 5X salt solution by using a lysine decarboxylase fermentation liquid in one step, and controlling the pH to be around 7 at the end of conversion; removing microorganisms by means of ceramic membrane filtration, adsorbing impurities, performing concentration and crystallization, subjecting the mother liquor after crystallization to extraction and crystallization by means of ethanol, and collecting the nylon 5X salt. The present invention increases yield and purity, and reduces contamination of production.

Description

technical field [0001] The invention relates to the technical field of nylon 5X salt production, in particular to a one-step production method of nylon 5X salt and a method for preparing 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 method has the following disadvantages: 1. A large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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