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Process for the manufacture of primary diamines

A technology for primary diamine and hexamethylene diamine, applied in the field of preparing hexamethylene diamine, can solve the problems of difficulty in obtaining high-purity hexamethylene diamine, high energy consumption and the like

Active Publication Date: 2013-03-20
POLYAMIDE HIGH PERFORMANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, it is difficult to obtain high-purity hexamethylene diamine
In addition, energy consumption is large

Method used

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  • Process for the manufacture of primary diamines

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Embodiment Construction

[0043] Reaction medium E obtained from the hydrogenation step of adiponitrile (not shown) in the presence of a Raney nickel-based catalyst and potassium hydroxide 0 into the distillation column 1. The column 1 operates at a pressure of 50 to 220 mmHg (6.6 kPa to 29.3 kPa), and has a theoretical plate number of 5 to 20.

[0044] The column is a structured packing column.

[0045] This column 1, known as a dehydration column, can remove the water contained in the reaction medium and the hexamethyleneimine in the head fraction E 1 recycling. tail fraction Q 1 Contains less than 50ppm of water.

[0046] This fraction Q 1 It is introduced into the secondary distillation column 2, which operates at a pressure of 50 to 250 mmHg (6.6 kPa to 33.3 kPa) and has a theoretical plate number of 1 to 5.

[0047] tail fraction Q 2 Consists of compounds with a boiling point higher than that of hexamethylenediamine. It accounts for the reaction medium E 0 1-10% by weight of heavy compou...

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Abstract

Primary diamines are prepared by hydrogenation of a dinitrile compound in the presence of a catalyst, in particular hexamethylenediamine is prepared by hydrogenation of adiponitrile; the product diamines are recovered by distillation in several distillation columns mounted in series and the heavy impurities are separated from the second distillation.

Description

technical field [0001] The present invention relates to a process for the preparation of primary diamines by hydrogenation of dinitrile compounds in the presence of a catalyst. [0002] In particular, the invention relates to a process for the preparation of hexamethylenediamine by hydrogenation of adiponitrile. Background technique [0003] Hexamethylenediamine is an extremely important chemical intermediate, especially used as a monomer for the preparation of polyamides. Thus, hexamethylenediamine is used in combination with adipic acid to form the amine salt, hexamethylenediamine adipate, also known as nylon salt. This salt is used in the preparation of polyhexamethylene adipamide commonly known as PA6,6. [0004] Hexamethylenediamine is also an important chemical intermediate in the preparation of diisocyanate compounds. [0005] The production process for hexamethylenediamine used on an industrial scale involves the hydrogenation of a dinitrile compound, ie adiponitr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C209/48C07C211/12
CPCC07C209/48C07C211/12B01J25/02C07C211/09
Inventor D·阿莫洛斯D·拉彻兹
Owner POLYAMIDE HIGH PERFORMANCE
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