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Molecular formula : C3H3NO2
MW : 85.06
CAS No. :372-09-8
nature : the white crystals, hygroscopicity. 66-68 ° C melting point, boiling point of 108 ° C (2:45, 3:59, 5:41). Dissolved in water, alcohol, ether, benzene-soluble and chloroform. The 160 ° C for the decomposition of carbon dioxide and acetonitrile. Generation after hydrolysis of malonic acid.
Preparation Methods : monochloroacetic acid, sodium carbonate, sodium cyanide as raw material, and in that cyanide, hydrochloric acid derived. Sodium carbonate slurry to join chloroacetic acid, in 45 ° C cycle and by the pH to between 7.5, and finished in liquid sodium dichloroacetate. China will join and liquid sodium cyanide solution 105-115 ° C in temperature, cyanide, holding 2-3 minutes of sodium cyanide B, and then down to below 50 ° C, B sodium cyanide into hydrochloride dehydration mixture for acidification, the final decompression dehydration, cyanide acid derived products. The consumption of raw materials fixed : trichloroacetic acid (95%) 1240kg / t, hydrogen cyanide (96%) 710kg / t.
purposes : organic synthesis intermediates, mainly for the synthesis of cyanide acid esters, also used in the production of alpha cyano-acrylate and butyl methacrylate (medical adhesive), vitamin B6, caffeine, such as phenobarbital.
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