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Phosgenation reactions with phosgene from triphosgene

HEINER ECKERT
Technische Universitaet Muenchen
Department Chemistry, Lichtenbergstr. 4, Garching, D-85748, Germany

Abstract

Presented is a method to combine advantageous propertiesof both phosgene and triphosgene (solid phosgene, BTC)in a two-step process for typical phosgenation reactionsto form chloro-carbonates and isocyanates. Also a 5 kgtriphosgene batch process for the synthesis of benzylchloroformate within a loop reactor is documented. Scopeand limitations of these triphosgene applications arediscussed. A concept for a small-scale batch processingphosgene generator ready for construction is presented.