Process for producing oxalyl chloride

Details Process for producing oxalyl chloride Process for producing oxalyl chloride

C - Chemistry, Metallurgy

07

C

204/91.23, 260/5

C07C 55/36 (2006.01) C07C 51/58 (2006.01) C07D 317/36 (2006.01) C07D 317/42 (2006.01)

Patent

CA 1159839

ABSTRACT OF THE DISCLOSURE A process is provided for producing oxalyl chloride by first photochemically chlorinating ethylene carbonate to form tetrachloroethylene carbonate and hydrogen chloride and then decomposing the tetrachloroethylene carbonate to oxalyl chloride and phosgene. The chlorination reaction is performed in a reaction vessel having an illuminated side arm conduit of narrow cross-sectional area. Chlorine is introduced at the base of the conduit and together with the hydrogen chloride evolved in the reaction continuously circulates the ethylene carbonate-chlorine reaction mixture through the narrow reaction zone within the conduit. The temperature of the ethylene carbonate-chlorine reaction mixture is controlled in the range of 70 to 100°C, preferably in the range of 79 to 81°C. The tetrachloroethylene carbonate is decomposed by heating same with a catalytic amount of a tertiary amine or amide.

375006

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