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High-purity nylon 5X salt and purification method thereof

A purification method and nylon technology, applied in the separation/purification of carboxylic acid compounds, amino compound purification/separation, organic chemistry, etc., can solve problems such as affecting the mechanical properties of nylon and limiting the growth of nylon molecular weight.

Pending Publication Date: 2020-10-27
CATHAY R&D CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses ethanol as a solvent, and alcohols and dibasic acids inevitably undergo esterification reactions to generate dibasic acid esters. This impurity is difficult to remove from nylon salts, and residual dibasic acid esters play a role in the polymerization process of nylon salts. The effect of the polymerization inhibitor limits the growth of nylon molecular weight, thus affecting the mechanical properties of nylon

Method used

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  • High-purity nylon 5X salt and purification method thereof
  • High-purity nylon 5X salt and purification method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0074] Referring to CN201410004636.3 and CN201810022432.0, the lysine fermentation liquid is passed through a ceramic membrane to obtain a pure lysine collection liquid, and after deamination, adipic acid and lysine are used to react to form a lysine adipate solution , to control the pH of the reaction solution between 5 and 7. Add the cultured lysine decarboxylase fermentation liquid to the above-mentioned treated lysine adipate feed liquid, and the added amount of the lysine decarboxylase fermentation liquid is 8 wt.% of the lysine adipate. During the conversion process, the pH is controlled to 7.1, controlled by adding adipic acid solids, and converted into an aqueous solution of pentamethylenediamine adipate, and the aqueous solution of pentamethylenediamine adipate is filtered through a ceramic membrane to obtain a nylon 56 salt solution. Then, the nylon 56 salt feed solution was added into lysine fermentation broth with 3wt.% activated carbon to decolorize the total amou...

preparation example 2

[0077] Referring to CN201410790873.7, a crude nylon 56 salt was prepared using purchased 1,5-pentanediamine and adipic acid as raw materials.

Embodiment 1

[0079] Add the nylon 56 crude product prepared in Preparation Example 1 into a 100-liter enamel reaction kettle, add 95wt.% ethanol aqueous solution to obtain a mixture of nylon 56 salts, wherein the mass of the nylon 56 salt crude product in the mixture of nylon 56 salts The fraction is 54%, heat up to 66°C to dissolve the above mixture, keep at this temperature for 0.5h, until the solution is transparent, start to cool down at a rate of 5min / °C to the precipitation temperature point of 60°C, at this time, there are solid particles precipitated in the solution by naked eyes At this temperature for 1 hour, the particles in the solution continued to increase. After the heat preservation was over, the temperature was lowered to 30 degrees at a rate of 5 min / °C. After the temperature was maintained for 1 hour, the crystallization slurry was directly centrifuged. 56 salt crude product by weight) washed with 95% ethanol aqueous solution, placed in a vacuum oven at 50° C., and dried ...

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Abstract

The invention relates to a high-purity nylon 5X salt and a preparation method thereof, wherein the purity of the nylon 5X salt reaches 99.5% or above, and the nylon 5X salt can be directly used for polymerization. According to the preparation method of the nylon 5X salt provided by the invention, pentamethylene diamine and nylon salt production processes are coupled together, and the nylon salt isproduced by a one-step method, so that the tedious and complex process flow is omitted, the equipment investment is reduced, and the production cost is saved; and the method provided by the inventionsolves the problem of low yield of nylon salt crystallization products by an aqueous solution method, the crystallization process is more effectively controlled, and explosion nucleation is avoided.

Description

technical field [0001] The invention belongs to the technical field of industrial crystallization, and in particular relates to a high-purity nylon 5X salt and a preparation method thereof. Background technique [0002] Polyamide, commonly known as nylon, is an important engineering plastic and textile fiber material. It is widely used in machinery, automobiles, electrical appliances, textile equipment, chemical equipment, aviation, metallurgy and other fields due to its excellent mechanical properties. At present, the monomers used in the production of nylon are mainly prepared by chemical methods, and the raw materials are derived from fossil energy. However, with the increasing shortage of fossil energy and the increasing awareness of environmental protection, the development of new chemical materials that use biomass as raw materials , in line with the overall goal of sustainable human development. In recent years, the technology of biological production of long-chain d...

Claims

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Application Information

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IPC IPC(8): C07C211/09C07C209/84C07C51/42C07C51/43C07C55/10C07C55/14C07C55/20C07C55/21C07C55/02
CPCC07C211/09C07C209/84C07C51/42C07C51/43C07C55/10C07C55/14C07C55/20C07C55/21C07C55/02
Inventor 董华董筱雯杨晨刘修才
Owner CATHAY R&D CENT CO LTD
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