Method for continuously preparing butanedinitrile

A technology for succinonitrile and acrylonitrile, which is applied in the field of reactors for continuous preparation of succinonitrile, can solve the problems of difficult production scale-up, poor intrinsic safety, and low production efficiency, and achieves reduced hazards, high production efficiency, and easy control Effect

Active Publication Date: 2014-01-22
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reactor and its process for producing succinonitrile solve the problems of difficult production scale-up, low production efficiency, poor safety of intermittent operation, complicated equipment,

Method used

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  • Method for continuously preparing butanedinitrile
  • Method for continuously preparing butanedinitrile
  • Method for continuously preparing butanedinitrile

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Example 1 as figure 1 As shown, the reactor for preparing succinonitrile mainly includes two parts of a small mixing tank and a microreactor, wherein the volume of the small mixing tank is 1L. The small mixing kettle includes five feeding nozzles (1) (2) (3) (4) (5), mixing agitator (6) (7), baffle plate (8) and outlet (9), etc. . Specifically, the top acrylonitrile feed nozzle (1) is located at the center of the shaft of the small mixing kettle, with a height d a-1 It is 90-95% of the kettle height H; two acrylonitrile feed nozzles (2) and (3) on the side of the small mixing kettle, height d a-2 、d a-3 35% of the kettle height H, such as figure 2 As shown, the straight lines where they are located are parallel to each other and have the same distance from the center of the circle, and the distance from the center of the circle is l a-2 , l a-3 It is 25% of the diameter D, and the length of the feed port in the kettle is s a-2 , s a-3 It is 20% of the diameter ...

Embodiment 2

[0056] The reactor structure is the same as in Example 1, except that the volume of the small mixing tank is 0.2L. Such as figure 1 As shown, two acrylonitrile feed nozzles (2) and (3) on the side of the small mixing tank, height d a-2 、d a-3 30% of the kettle height H, such as figure 2 As shown, the straight lines where they are located are parallel to each other and have the same distance from the center of the circle, and the distance from the center of the circle is l a-2 , l a-3 It is 30% of the diameter D, and the length of the feed port in the kettle is s a-2 , s a-3 It is 15% of the above-mentioned circle diameter D; the hydrocyanic acid feed nozzle (4) at the bottom is located on the center of the shaft of the mixing kettle with a height of d a-4 It is 8% of the kettle height H; the bottom catalyst feed nozzle (5), located on the center of the mixing kettle axis, has a height of d a-5 It is 18% of the kettle height H. Such as figure 1 As shown, the middle an...

Embodiment 3

[0062] The reactor structure is the same as in Example 1, except that the volume of the small mixing tank is 0.35L. Two acrylonitrile feed nozzles (2) and (3) on the side of the small mixing tank, height d a-2 、d a-3 40% of the kettle height H, such as figure 2 As shown, the straight lines where they are located are parallel to each other and have the same distance from the center of the circle, and the distance from the center of the circle is l a-2 , l a-3 It is 28% of the diameter D, and the length of the feed port in the kettle is s a-2 , s a-3 It is 18% of the above-mentioned circle diameter D; the bottom prussic acid feed nozzle (4) is located on the center of the shaft of the mixing kettle, with a height of d a-4 It is 10% of the kettle height H; the bottom catalyst feed nozzle (5), located on the center of the shaft of the mixing kettle, has a height of d a-5 It is 20% of the kettle height H. The middle and upper part of the mixing agitator is a propulsive stir...

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Abstract

The invention provides a butanedinitrile preparation reactor and a method for continuously preparing butanedinitrile by using the reactor. According to the invention, reaction raw materials hydrocyanic acid, acrylonitrile, and a catalyst are continuously delivered through a small mixing kettle with a special structure and a plurality of subsequent millimeter-grade to micrometer-grade regular reaction channels which have special internal structures and which are connected in parallel, such that butanedinitrile can be continuously and stably prepared with high yield. The reactor has excellent mixing effect and a heat change capacity. Compared with a traditional reactor, mass transfer and heat transfer problems during the butanedinitrile reaction process can be well solved, such that problems such as low reaction yield, large amount of by product, and the like caused by poor mass transfer and heat transfer are effectively solved. More precise automatic control of the reaction process can be easily realized. Equipment space occupation is low, energy consumption is greatly reduced, and intrinsic safety is greatly improved.

Description

technical field [0001] The invention relates to a reactor for continuously preparing succinonitrile, and a process method for preparing succinonitrile by using the reactor. Background technique [0002] Succinonitrile, also known as 1,2-dicyanoethane, succinonitrile, molecular formula NCCH 2 CH 2 CN is a colorless and odorless waxy substance with a melting point of 58.1°C, soluble in acetone, chloroform, dioxane, slightly soluble in water, ethanol, ether, carbon disulfide and benzene. React with hydrogen to generate butylenediamine. Succinonitrile is mainly used as the raw material of quinacridone pigments, which are widely used in automotive and galvanized iron sheet coatings, color printing pigments and colorants for plastic products; it is also used in the production of nylon and pharmaceutical intermediates; it can also be used as reagent. [0003] The current method of producing succinonitrile mainly takes acrylonitrile and hydrocyanic acid as raw materials and reac...

Claims

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Application Information

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IPC IPC(8): B01J19/18B01J19/16C07C253/10C07C255/04
CPCY02P20/141
Inventor 丛鑫谢增勇董岩峰信勇刘运海叶天牟通朱发明王漭黎源华卫琦姜庆梅宋锦宏
Owner WANHUA CHEM GRP CO LTD
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