Method for recycling by-product beta, beta-dicyanoethyl ether in acrylonitrile synthesis

A technology of dicyanoethyl ether and acrylonitrile, which is applied in the direction of carboxylic acid nitrile purification/separation, organic chemistry, etc., can solve the problem of high processing cost, and achieve the effect of reducing the reaction temperature

Pending Publication Date: 2022-03-08
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the total amount is not much, the processing cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 180 grams of β,β-dicyanoethyl ether, a by-product in the synthesis of acrylonitrile, into a 250 ml three-necked bottle, insert a thermometer and a vacuum connecting tube into the two ports of the three-necked bottle, and connect it to a -30°C cold trap, and put in 3.0 grams of acetic acid trihydrate Sodium, electromagnetic stirring, vacuuming to 0.35Kpa, oil bath heating kettle temperature to 150°C, the extracted steam is cooled by a cold trap without separation and used as a raw material for the synthesis of cyanopropionitrile, the liquid is decomposed in about 100 minutes, and the remaining salt can be Always apply.

Embodiment 2

[0024] Put 180 grams of β,β-dicyanoethyl ether, a by-product in the synthesis of acrylonitrile, into a 250 ml three-necked bottle, insert a thermometer and a vacuum connecting tube into the two ports of the three-necked bottle, and connect it to a -30°C cold trap, and put 4.5 grams of acetic acid trihydrate Sodium, electromagnetic stirring, vacuuming to 0.2Kpa, oil bath heating kettle temperature to 150°C, the extracted steam is cooled by a cold trap without separation and used as a raw material for the synthesis of cyanopropionitrile, the liquid is decomposed in about 65 minutes, and the remaining salt can be kept apply.

Embodiment 3

[0026] Put 180 grams of β,β-dicyanoethyl ether, a by-product in the synthesis of acrylonitrile, into a 250-milliliter three-necked bottle, insert a thermometer and a vacuum connecting tube into the two ports of the three-necked bottle, and connect it to a -30°C cold trap, and put 3.0 grams of dihydrogen phosphate Sodium, electromagnetic stirring, vacuuming to 0.4Kpa, oil bath heating kettle temperature to 160°C, extracting steam and cooling in a cold trap without separation as raw material for synthesizing cyanopropionitrile, the liquid is decomposed in about 80 minutes, and the remaining salt can be used mechanically .

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PUM

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Abstract

The invention relates to a method for recycling a by-product beta, beta-dicyanoethyl ether in acrylonitrile synthesis, which comprises the following steps: putting beta, beta-dicyanoethyl ether in acrylonitrile synthesis into a reaction container, connecting a cold trap, adding a strong alkali and weak acid salt, heating to react under stirring and vacuumizing conditions, cooling the obtained steam, and taking the cooled steam as a raw material for synthesizing hydroxypropionitrile, thereby obtaining the beta, beta-dicyanoethyl ether in acrylonitrile synthesis. The rest salt is repeatedly used, and the process is completed. Compared with the prior art, the method is simple in technological process, free of three wastes and the like.

Description

technical field [0001] The invention belongs to the technical field of green recovery and reuse of by-products, and relates to a method for recycling β,β-dicyanoethyl ether, a by-product in the synthesis of acrylonitrile. Background technique [0002] At present, the by-products β, β-dicyanoethyl ether are treated in the industry as follows: [0003] 1. Incinerate the still bottom containing β,β-dicyanoethyl ether after distilling hydroxypropionitrile. Although this treatment saves trouble, the smoke from incineration is highly toxic when discharged as exhaust gas, and it will cause liquid waste when discharged into water. [0004] 2. Purify and sell β,β-dicyanoethyl ether as a product. Because the total amount is not much, the processing cost is high. [0005] Therefore, there is an urgent need for a green recovery process for the by-product β,β-dicyanoethyl ether. Contents of the invention [0006] The object of the present invention is to provide a method for recycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/34C07C255/12
CPCC07C253/34C07C255/12
Inventor 周祖新王爱民郭晓明李亮郭强胜
Owner SHANGHAI INST OF TECH
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