Process for the continuous preparation of (cyclo)aliphatic diisocyanates

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United States of America Patent

PATENT NO 8816125
APP PUB NO 20100036154A1
SERIAL NO

12519795

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Abstract

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The invention relates to a multi-stage process for the continuous, phosgene-free preparation of (cyclo)aliphatic diisocyanates that comprises the conversion of (cyclo)aliphatic diamines into the corresponding (cyclo)alkylene biscarbamates and the thermal cleaving of the latter into the (cyclo)alkylene diisocyanates and alcohol. The urea used in accordance with the invention and also the urea employed for the preparation of urea equivalents (e.g. alkyl carbonates, alkyl carbamates) as a possible precursor for the synthesis of the (cyclo)aliphatic biscarbamates is unconditioned.

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Patent OwnerAddress
EVONIK OPERATIONS GMBHRELLINGHAUSER STRASSE 1-11 ESSEN 45128

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Grund, Gerda Coesfeld, DE 24 254
Kohlstruk, Stephan Duelmen, DE 59 522
Kreczinski, Manfred Herne, DE 24 96
Lomoelder, Rainer Muenster, DE 25 255
Michalczak, Hans-Werner Herne, DE 10 131

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