Process for the continuous preparation of (cyclo)aliphatic diisocyanates
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United States of America Patent
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Aug 26, 2014
Grant Date -
Feb 11, 2010
app pub date -
Nov 5, 2007
filing date -
Dec 23, 2006
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Abstract
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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