Multistage continuous preparation of cycloaliphatic disocyanates

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 7557242
APP PUB NO 20050250960A1
SERIAL NO

11100603

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Abstract

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Cycloaliphatic diisocyanates can be prepared continuously and phosgene-free by reacting at least one cycloaliphatic diamine with at least one carbonic acid derivative and at least one alcohol to give a cycloaliphatic diurethane; freeing the cycloaliphatic diurethane of a low boiler, a medium boiler and mixtures thereof; thermally cleaving the cycloaliphatic diurethane in a cleavage apparatus to give a cycloaliphatic diisocyanate and a cleavage residue; continuously discharging a portion of the cleavage residue from the cleavage apparatus; removing the high boiler components from the discharge to obtain a purified discharge; reurethanizing the purified discharge with alcohol to obtain a reurethanized discharge; and recycling the reurethanized discharge into the process.

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Patent Owner(s)

  • EVONIK DEGUSSA GMBH

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kohlstruk, Stephan Duelmen , DE 59 522
Kreczinski, Manfred Herne , DE 24 96
Michalczak, Hans-Werner Herne , DE 10 131

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