Hydrogenation of methylenedianiline

Details Hydrogenation of methylenedianiline Hydrogenation of methylenedianiline

2006-02-14

2006-02-14

Davis, Brian (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

Reexamination Certificate

active

06998507

ABSTRACT:
The invention is directed to an improvement in a catalytic process for the ring hydrogenation of a methylenedianiline feedstock, including crude methylenedianiline. One component of the improvement is a pretreatment process which resides in passing the crude methylenedianiline feedstock over a ruthenium catalyst carried on a fixed bed support, cooling without venting, and then hydrogenation of the pretreated crude methylenedianiline feedstock over a rhodium catalyst or a mixed Rh/Ru catalyst carried on a monolith support and carrying out the ring hydrogenation in a batch reaction. Another component in the improvement is the employment of a catalyst comprised of rhodium and ruthenium carried on a monolith support.

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