Reducing phosgenation reaction temperatures

Details Reducing phosgenation reaction temperatures Reducing phosgenation reaction temperatures

1985-09-23

1987-03-10

Helfin, Bernard

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

558268, 558281, 558282, C07C 6802, C07C 6996

Patent

active

046492100

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 polycarbonates and higher yields of monomeric and dimeric bischloroformates are obtained.

REFERENCES:
patent: 4025489 (1977-05-01), Bailey et al.
patent: 4089888 (1978-05-01), Tokumitsu et al.
patent: 4255557 (1981-03-01), Megumi et al.

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