Reducing phosgenation reaction temperatures

Details Reducing phosgenation reaction temperatures Reducing phosgenation reaction temperatures

C - Chemistry, Metallurgy

07

C

402/179, 260/467

C07C 68/02 (2006.01) C07B 47/00 (2006.01) C07C 45/47 (2006.01) C07C 69/96 (2006.01)

Patent

CA 1256892

RD-16,212 REDUCING PHOSGENATION REACTION TEMPERATURES ABSTRACT A method is provided for reducing the reflux temperatures of methylene chloride in phosgenation reactions by introducing a second inert vaporizable component to the reaction medium. This second inert vaporizable component has a lower vaporization temperature than the methylene chloride so as to reduce the temperature of vaporization of the mixture. More efficient use of phosgene is obtained when polymerizing aromatic dihydroxy compounds to polycar- bonates and higher yields of monomeric and dimeric bischloroformates are obtained.

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