The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 14, 2006
Filed:
Aug. 24, 2004
Hao Ding, Macungie, PA (US);
Anthony Rocco Cartolano, Orefield, PA (US);
Vipul P. Dholakia, Macungie, PA (US);
Gamini Ananda Vedage, Bethlehem, PA (US);
Hao Ding, Macungie, PA (US);
Anthony Rocco Cartolano, Orefield, PA (US);
Vipul P. Dholakia, Macungie, PA (US);
Gamini Ananda Vedage, Bethlehem, PA (US);
Air Products and Chemicals, Inc., Allentown, PA (US);
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.