Method for producing adiponitrile

A technology of adiponitrile and adipic acid, applied in the field of chemical product synthesis, can solve the problems of long reaction residence time, unfavorable continuous reaction process, etc., and achieve the effects of easy industrialization, high safety and high degree of automation

Active Publication Date: 2019-12-13
CHINA TIANCHEN ENG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The above two processes are all reactions in batch reactors under high pressure, and the reaction residence time is long, which is not conducive to continuous reaction process

Method used

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  • Method for producing adiponitrile

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Embodiment 1

[0027] Use low hydrogen 5% (mole ratio, the remaining 95% is nitrogen), reduce the Ru / activated carbon catalyst at normal pressure in the pipeline reactor, the reduction temperature is 500°C, the reduction time is 10h, and the volume space velocity during reduction is 8000h -1 ·ml / gcat. Adipic acid uses 1 times the number of moles of methanol as a solvent, the reaction pressure is 5MPa, the reaction temperature is 200°C, and the feed space velocity is 5h -1 ·ml / gcat, the molar amount of hydrogen continuously fed is 10 times that of adipic acid, the reaction products are all liquid, the output rate control is consistent with the feed, and the product and a small amount of catalyst that may be brought out are separated in the filter to achieve solid-liquid separation . The intermediate product A (including a mixture of hexanediol and a small amount of 6-hydroxyl-1-hexanal and methanol) generated by the first step reaction is gaseous at 200 degrees under normal pressure (contain...

Embodiment 2

[0029] Use low hydrogen 5% (mole ratio, the remaining 95% is nitrogen), reduce the Ru / activated carbon catalyst at normal pressure in the pipeline reactor, the reduction temperature is 500°C, the reduction time is 10h, and the volume space velocity during reduction is 8000h -1 ·ml / gcat. Adipic acid uses 1 times the number of moles of methanol as a solvent, the reaction pressure is 5MPa, the reaction temperature is 200°C, and the feed space velocity is 30h -1 ·ml / gcat, the molar amount of hydrogen continuously fed is 10 times that of adipic acid, the reaction products are all liquid, the output rate control is consistent with the feed, and the product and a small amount of catalyst that may be brought out are separated in the filter to achieve solid-liquid separation . The intermediate product A (comprising a small amount of hexanediol, a large amount of adipaldehyde, 6-hydroxyl-1-hexanal, and methanol) produced by the first step reaction is gaseous at 200 degrees under normal...

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Abstract

The invention provides a method for producing adiponitrile. The method comprises the following steps: 1) carrying out a hydrogenation reaction on adipic acid to generate an intermediate product A, wherein the intermediate product A is one or more than two selected from the group consisting of 6-formyl-1-hexanoic acid, hexanediol, adipic dialdehyde and 6-hydroxy-1-hexanal; and 2) carrying out an ammoxidation reaction on the intermediate product A to generate adiponitrile. A raw material used in the method is adipic acid with excess capacity at present, so the conversion and value increase of the excess product are achieved, the urgent problem of insufficient adiponitrile capacity in China can be relieved, and great economic significance is achieved; and according to the method, highly toxicacrylonitrile in an acrylonitrile method can be avoided, the whole process is simple, operation is convenient, the degree of automation is high, and industrial popularization is facilitated.

Description

technical field [0001] The invention belongs to the technical field of chemical product synthesis, and in particular relates to a method for producing adiponitrile. Background technique [0002] Adiponitrile (ADN) is also known as 1,4-dicyanobutane, and its molecular formula is NC(CH 2 ) 4 CN, the addition of adiponitrile and hydrogen can produce hexamethylenediamine, and the reaction of hexamethylenediamine and adipic acid under strict material ratio produces nylon 66 salt. Using adiponitrile as an important intermediate for the synthesis of nylon 66 is the most important and most valuable industrial use developed by adiponitrile; research has found that hexamethylenediamine can synthesize 1,6-hexamethylene diisocyanate (HDI), which is It is another important use for the development of the downstream product chain of adiponitrile; with the rapid development of science and technology, the use of adiponitrile in light industry, electronics and other organic synthesis fields...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/149C07C31/20C07C45/41C07C47/12C07C47/19C07C253/24C07C255/04
CPCC07C29/149C07C45/41C07C253/24C07C31/20C07C47/12C07C47/19C07C255/04
Inventor 李欢左宜赞吕金昆王聪刘新伟杨克俭
Owner CHINA TIANCHEN ENG
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