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Diamine purification method

A purification method, aliphatic diamine technology, applied in chemical instruments and methods, amino compound purification/separation, organic chemistry, etc., can solve difficult to obtain high degree of polymerization, polymer structure and wire cross-section irregularity, high fracture rate And other issues

Inactive Publication Date: 2006-09-06
RHODIA POLYAMIDE INTERMEDIATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the presence of impurities makes it difficult to obtain a high degree of polymerization, especially resulting in a pale yellow polymer
Furthermore, many serious difficulties are encountered in the application of these polymers, especially in the production of filaments (fil) or fibers, such as high breakage rates during spinning and drawing
In addition, these impurities can cause irregularities in the polymer structure and thread cross-section, thus leading to dyeing inhomogeneities which are very detrimental to the quality of the textile surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The hexamethylenediamine obtained from the hydrogenation of adiponitrile in the presence of Raney nickel is distilled.

[0035] The weight concentration of main impurity is as follows:

[0036] ◆Wt% of THA: 0.113%

[0037] ◆POLI, mmol / ton: 7900

[0038] Hexamethylenediamine was charged to a stirred reactor containing palladium on carbon catalyst containing 0.5% palladium. Such catalysts are sold by the company ENGELHARD.

[0039] The hydrogen pressure is 18 bar.

[0040] After reacting at 120°C for 120 minutes, the recovered hexamethylenediamine contained 0.0043% THA and its POLI was 4000.

Embodiment 2

[0042] A test similar to Example 1 was carried out for the treatment of hexamethylenediamine containing 0.1066% THA and a POLI of 12000.

[0043] After treatment at 120°C for 120 minutes, the THA content decreased to 0.0072%, and the POLI was 1900.

Embodiment 3

[0045] According to the operation method of Example 1, hexamethylene diamine containing 0.0406% THA and POLI of 4671 was treated at a temperature of 135° C. for 60 minutes.

[0046] The THA concentration of the obtained hexamethylenediamine was 0.00036%, and the POLI was 244.

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Abstract

The invention relates to a method of purifying diamines which are obtained by hydrogenation of dinitriles. More specifically, the invention relates to the purification of hexamethylene diamine which is obtained by hydrogenation of adiponitrile. The inventive method consists in treating at least one part of the hexamethylene diamine flow drawn from the distillation column and re-injecting the treated flow back into the column.

Description

field of invention [0001] The present invention relates to a method for purifying diamines obtained by hydrogenating dinitriles. [0002] More specifically, the present invention relates to a process for the purification of hexamethylenediamine obtained by hydrogenating adiponitrile. Background technique [0003] These diamines are important intermediate chemicals especially in the production of polymers. Therefore, hexamethylene diamine is an important monomer for the preparation of polymers, especially for the production of polyhexamethylene adipamide. [0004] For the production of these polyamides it is both important and necessary that the hexamethylenediamine is characterized by a very high purity. This is because the presence of impurities makes it difficult to obtain a high degree of polymerization, especially a pale yellow polymer. Furthermore, serious difficulties are encountered when using these polymers, especially in the production of fils or fibers, such as,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/84
CPCC07C209/84C07C209/48C07C209/90C07C211/09
Inventor D·勒图尔纳P·马里翁
Owner RHODIA POLYAMIDE INTERMEDIATES
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