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A kind of synthetic method and device of β-aminopropionitrile

A technique for the synthesis of aminopropionitrile, which is applied in separation methods, chemical instruments and methods, and preparation of carboxylic acid nitriles, and can solve the problems of high processing costs and low yields of hazardous chemicals

Active Publication Date: 2021-08-20
江苏兄弟维生素有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a kind of synthetic method of β-aminopropionitrile, through new processing step, improve the utilization rate of by-product, improve the yield of β-aminopropionitrile simultaneously, to solve the problem existing in the prior art The problem of low yield and high cost of hazardous chemicals treatment

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  • A kind of synthetic method and device of β-aminopropionitrile
  • A kind of synthetic method and device of β-aminopropionitrile
  • A kind of synthetic method and device of β-aminopropionitrile

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Embodiment 1

[0069] The synthetic method of the β-aminopropionitrile of present embodiment, comprises the steps:

[0070] (1) Add 50 g of β-aminopropionitrile distillation waste liquid (wherein β, β-iminodipropionitrile content is 90%) in the autoclave, add 320 g of 35% ammonia water, heat up to 150 ° C under airtight conditions, and keep the temperature at 3 MPa React for 5h, after the heat preservation finishes, drop to room temperature;

[0071] (2) Distill the mixed liquid obtained after taking out the reaction, recover ammonia water, and recover ammonia water by distillation under reduced pressure at 45-55°C and -0.095MPa. After the recovery of ammonia water is completed, when the temperature in the remaining mixed liquid reaches 100°C, start mixing Water vapor is passed into the liquid for steam distillation. The pressure of water vapor is divided into four stages and the temperature of the mixed liquid is controlled at 110-115°C. Distillation under reduced pressure at -0.095MPa. The...

Embodiment 2

[0073] The synthetic method of the β-aminopropionitrile of present embodiment, comprises the steps:

[0074] (1) Add 50 g of β-aminopropionitrile distillation waste liquid in the autoclave (the content of β, β-iminodipropionitrile is 90%), add 320 g of 35% ammonia water, heat up to 150° C. under airtight conditions, and keep the temperature for 5 hours , after the heat preservation is over, drop to room temperature;

[0075] (2) Take out the mixed solution obtained after the reaction and distill, reclaim ammonia water, after the recovery of ammonia water, when the temperature in the heated remaining mixed solution reaches 100°C, start to feed water vapor into the remaining mixed solution for steam distillation, the pressure of water vapor is divided into Four stages and control the temperature of the mixed liquid at 110-115°C, -0.095MPa vacuum distillation, the flow rate of the steam is 9-11m / s, the initial pressure is 0.06MPa, after distillation collects 27gβ-aminopropionitri...

Embodiment 3

[0079] The synthetic method of the β-aminopropionitrile of present embodiment, comprises the steps:

[0080] (1) Add 50 g of β-aminopropionitrile distillation waste liquid (wherein the content of β, β-iminodipropionitrile is 90%) in the autoclave, add 320 g of 35% ammonia water, heat up to 150 ° C under airtight conditions, and keep the temperature for 5 hours , after the heat preservation is over, drop to room temperature;

[0081] (2) Distill the mixed solution obtained after taking out the reaction, reclaim ammonia water, after the recovery of ammonia water, when the temperature in the heated remaining mixed solution reaches 100°C, start to feed water vapor into the remaining mixed solution for steam distillation, the pressure of water vapor is 0.17 MPa, and the temperature of control mixed solution is 110-115 ℃,-0.095MPa decompression distillation, the flow velocity of steam is 9-11m / s; Distillation collects and obtains β-aminopropionitrile 54.6g, through a reaction, disti...

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Abstract

The invention relates to the technical field of chemical synthesis technology, in particular to a synthesis method and device for β-aminopropionitrile. The synthetic method of described β-aminopropionitrile comprises the following steps: (a) after the reaction of acrylonitrile and ammonia water, distillation collects β-aminopropionitrile; (b) mixing the remaining waste liquid after distillation with ammonia water and raising the temperature to obtain a mixed Liquid, distill mixed solution to collect β-aminopropionitrile, reclaim distillation waste liquid and ammoniacal liquor reaction; Wherein, the distillation condition in the step (b) comprises: adopt steam distillation to distill mixed solution to collect β-aminopropionitrile, steam distillation comprises at least Two-stage steam distillation, the water vapor pressure gradient of each stage of steam distillation increases. The regulation of the process conditions in the present invention can effectively control the temperature of the distillation system not to exceed 120°C while ensuring the distillation yield of the product β-aminopropionitrile, and the material components in the waste liquid are not destroyed, and can be used as raw materials for the reaction. Improve the yield of β-aminopropionitrile.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis technology, in particular to a synthesis method and device of β-aminopropionitrile. Background technique [0002] β-Aminopropionitrile is an important organic chemical intermediate, and its more commonly used preparation method is through the reaction of ammonia and acrylonitrile. However, due to side reactions in the preparation process, and its by-products cannot be used directly, they can only be treated as hazardous chemicals, resulting in low yield of β-aminopropionitrile and high cost of hazardous chemicals disposal. [0003] Therefore, it is of great significance to develop a synthetic method and device for β-aminopropionitrile with high yield. [0004] In view of this, the present invention is proposed. Contents of the invention [0005] The first object of the present invention is to provide a kind of synthetic method of β-aminopropionitrile, through new processing step, im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/30C07C253/34C07C255/24B01D3/00
CPCB01D3/009C07C253/30C07C253/34C07C255/24
Inventor 陈英明王诚李褦成严建斌
Owner 江苏兄弟维生素有限公司
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