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Preparation method of 3-pentenenitrile and preparation method of adiponitrile

A technology of pentenenitrile and butadiene, which is applied in the preparation of 3-pentenenitrile and adiponitrile, and can solve the problems of increasing catalyst regeneration process cost, high production cost, equipment investment cost, and high process cost , to achieve the effect of reducing production cost and equipment investment, reducing production cost and equipment investment, and simplifying the process flow

Active Publication Date: 2013-04-03
ANHUI ANQING SHUGUANG CHEM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 2M3BN isomerization reaction process, there will be very high production costs and equipment investment costs; and due to the high temperature and long residence time of the isomerization process, it will cause undesirable dissociation, dissociation, and Deactivation, thereby increasing the amount of catalyst used and the cost of the catalyst regeneration process
Therefore, the cost of the whole process is high and the process is complicated

Method used

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  • Preparation method of 3-pentenenitrile and preparation method of adiponitrile
  • Preparation method of 3-pentenenitrile and preparation method of adiponitrile
  • Preparation method of 3-pentenenitrile and preparation method of adiponitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The molar ratio of monodentate phosphine (tri-o-cresyl phosphite) and bidentate phosphine (ligand A) with zero-valent nickel, HCN, BD and benzene is 6:115:165:200 (among them, The molar ratio of tooth phosphine: bidentate phosphine: zero-valent nickel is 5:5::1) was put into the tank reactor, the reaction temperature was controlled at 100°C, and the reaction residence time was 4 hours to obtain the first mixture.

[0060]

[0061] bidentate phosphine ligand A

[0062] The first mixture is introduced into a first rectification column for rectification. The first rectification tower adopts a rectification tower with 35 trays, wherein the top pressure of the rectification tower is 0.04MPa, the pressure of the bottom of the tower is 0.1Pa, the temperature of the top of the tower is -10 degrees Celsius, and the temperature of the bottom of the tower is 120 Celsius. The second mixture is obtained as the heavy component of the tower bottom of the first rectification tower...

Embodiment 2

[0066] Complexes composed of monodentate phosphine (tri-m-cresyl phosphite) and bidentate phosphine (ligand B) with zero-valent nickel, HCN, BD and di The molar ratio of methyl formamide is 6:115:165:200 (in the complexes composed of monodentate phosphine and bidentate phosphine and zero-valent nickel, the molar ratio of monodentate phosphine: bidentate phosphine: zero-valent nickel is 6 :2:1) into the tank reactor, the reaction temperature is controlled at 100°C, and the reaction residence time is 4 hours.

[0067]

[0068] bidentate phosphine ligand B

[0069] The resulting product-first mixture is introduced into a third rectification column. The third rectification tower adopts a rectification tower with 50 trays, wherein the top pressure of the rectification tower is 0.05MPa, the pressure of the bottom of the tower is 0.06MPa, the temperature of the top of the tower is 40 degrees Celsius, and the temperature of the bottom of the tower is 135 degrees Celsius . The fi...

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Abstract

The invention provides a preparation method of 3-pentenenitrile and a preparation method of adiponitrile. The preparation method of 3-pentenenitrile comprises the following steps: 1, performing the hydrocyanation reaction on raw material mixed solution of butadiene and hydrocyanic acid under the action of a catalyst so as to obtain a first mixture containing the 3-pentenenitrile; and 2, carrying out separation on the first mixture to obtain the 3-pentenenitrile, wherein the catalyst is a coordination complex consisting of monodentate phosphine, bidentate phosphine and zero-valent nickel. By adopting the method, the 3-pentenenitrile can be effectively, efficiently and economically prepared by using the butadiene and the hydrocyanic acid as the raw materials; the integral process is safe and reliable; the flow is simple; and moreover, production cost and equipment investment can be obviously reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, more specifically, to a preparation method of 3-pentenenitrile and adiponitrile. Background technique [0002] The process of producing adiponitrile by hydrocyanation of butadiene was successfully developed by DuPont Company of the United States in the 1970s and applied to industrial production. The preparation of adiponitrile by hydrocyanation of butadiene adopts a monodentate phosphine-zero-valent nickel complex as a catalyst, and mainly includes the following three reaction steps: [0003] [0004] First, the hydrocyanation reaction of butadiene and hydrocyanic acid (HCN) under the catalysis of a monodentate phosphine-zero-valent nickel complex produces a linear product 3-pentenenitrile (3PN) and a branched by-product 2- Methyl-3-butenenitrile (2M3BN); then, 2M3BN undergoes an isomerization reaction to generate 3-PN; finally, 3PN undergoes a hydrocyanation reaction with hydrocyanic acid (H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C255/07C07C255/04C07C253/10
Inventor 韩明汉余永发陈长斌陈韬王军王金福吴琨余升琴
Owner ANHUI ANQING SHUGUANG CHEM GRP
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