Hydrogenation of aromatic urethanes in the presence of a...

Details Hydrogenation of aromatic urethanes in the presence of a... Hydrogenation of aromatic urethanes in the presence of a...

C - Chemistry, Metallurgy

08

F

C08F 8/04 (2006.01) B01J 23/46 (2006.01) B01J 35/00 (2006.01) B01J 35/10 (2006.01) C07C 269/00 (2006.01) C07C 271/28 (2006.01) C08G 71/04 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2449235

The invention relates to a process for hydrogenating aromatic urethanes which have one or more aromatic rings and one or more urethane groups bonded directly and/or indirectly to one aromatic ring or different aromatic rings with hydrogen in the presence of a supported catalyst which comprises ruthenium as the active metal. The catalyst support of the catalyst to be used according to the invention has a BET surface area in the range from greater than 30 m2/g to less than 70 m2/g and more than 50% of the pore volume of the catalyst support is macropores having a pore diameter of greater than 50 nm and less than 50% is mesopores having a pore diameter of from 2 to 50 nm. The process is suitable in particular for hydrogenating dibutyl 4,4'-methylenedicarbanilate to dibutyl 4,4'-methylenedicyclohexylcarbamate having a trans-trans isomer content of <30%, preferably <20%, more preferably from 5 to 15%.

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