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Introduction to the synthesis of cyanoacetic acid

 2022-7-2     

It is prepared from chloroacetic acid, sodium carbonate and sodium cyanide through neutralization, cyanidation and hydrochloric acid acidification. Add sodium carbonate suspension into chloroacetic acid, circulate and neutralize below 45 ℃ to pH=7.5-8, and obtain sodium chloroacetate solution after neutralization. Add the neutralization solution into the sodium cyanide solution at 105-115 ℃, carry out cyanidation, keep the temperature for 2-3 minutes to obtain sodium cyanoacetate, and then cool it to below 50 ℃. Put the sodium cyanoacetate into the dehydration pan for acidification with hydrochloric acid, and finally decompress and dehydrate to obtain finished cyanoacetic acid. Raw material consumption quota: chloroacetic acid (95%) 1240kg/t, sodium cyanide (96%) 710kg/t.

Use of cyanoacetic acid:

1. Organic synthesis intermediates, mainly used for the synthesis of cyanoacetate, also used for production α Methyl cyanoacrylate and n-butyl ester (medical adhesive), vitamin B6, caffeine, barbital, etc.

2. It is used for organic synthesis, and used to produce caffeine in medicine.

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