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Recycling technology of beta-aminopropionitrile

A technology of aminopropionitrile and iminodipropionitrile, which is applied in the recovery process field of β-aminopropionitrile, can solve the problems affecting the product yield and the by-products cannot be directly recycled, so as to reduce production costs and increase recycling , Reduce the effect of waste liquid treatment

Inactive Publication Date: 2016-08-24
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

But because the amino group of β-aminopropionitrile has stronger alkalinity than ammoniacal liquor, more by-products can still be produced by side reaction with acrylonitrile, not only influence the yield of product, and by-product also can't directly recycle, only Can be treated as hazardous chemicals

Method used

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  • Recycling technology of beta-aminopropionitrile
  • Recycling technology of beta-aminopropionitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 50g of β-aminopropionitrile distillation waste liquid (in which β, β-iminodipropionitrile content is 80%) into the autoclave, add 200g of 35% ammonia water, seal the autoclave and heat up to 120℃, and control the pressure at 4MPa, heat preservation for 2 hours. After the incubation, the temperature was lowered to room temperature, the reaction solution was taken out into a three-necked flask, the ammonia water was first recovered, and then β-aminopropionitrile was distilled to distill out 42g of aminopropionitrile, with a one-time addition yield of 61.7%.

Embodiment 2

[0034] Add 50g of β-aminopropionitrile distillation waste liquid (in which β, β-iminodipropionitrile content is 80%) into the autoclave, add 200g of 35% ammonia water, seal the autoclave and heat up to 150℃, and control the pressure at 4MPa, heat preservation for 3 hours. After the incubation, the temperature was lowered to room temperature, the reaction solution was taken out into a three-necked flask, the ammonia water was first recovered, and then β-aminopropionitrile was distilled to distill out 45g of aminopropionitrile, with a one-time addition yield of 68%.

Embodiment 3

[0036] Add 50g of β-aminopropionitrile distillation waste liquid (in which β, β-iminodipropionitrile content is 80%) into the autoclave, add 250g of 35% ammonia water, seal the autoclave and heat it up to 120°C, and control the pressure at 4MPa, heat preservation for 2 hours, after the heat preservation, cool to room temperature, take out the reaction liquid into a three-necked flask, first recover ammonia, then distill β-aminopropionitrile, distill 46.7g aminopropionitrile, one-time addition yield 68.7%.

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Abstract

The invention provides a recycling technology of beta-aminopropionitrile. A by-product beta in beta-aminopropionitrile production and beta-iminodipropionitrile continue to be recycled and react to generate beta-aminopropionitrile. The adopted recycling technology improves the beta-aminopropionitrile yield to a larger extent, improves recycling of raw materials in liquid waste, lowers liquid waste disposal, lowers the production cost, and reduces environmental influences.

Description

Technical field [0001] The invention relates to a synthesis process of organic compounds, in particular to a recovery process of β-aminopropionitrile. Background technique [0002] β-Aminopropionitrile is an important organic chemical intermediate, and its more commonly used preparation method is produced by the reaction of ammonia and acrylonitrile. However, because the amino group of β-aminopropionitrile is more basic than ammonia, it will still react with acrylonitrile to produce more by-products, which not only affects the yield of the product, but also the by-products cannot be directly recycled. Can be treated as hazardous chemicals. Summary of the invention [0003] The purpose of the present invention is to provide a recovery process for β-aminopropionitrile which can increase the product yield, reduce waste liquid treatment and reduce production costs. [0004] In order to achieve the above objective, the present invention adopts the following technical scheme: a process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C255/24C07C253/30C07C253/34
CPCC07C253/30C07C253/34
Inventor 李来成陈英明严建斌
Owner 江苏兄弟维生素有限公司