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:
May. 02, 2006
Filed:
May. 19, 2004
Hao Ding, Macungie, PA (US);
Gamini Ananda Vedage, Bethlehem, PA (US);
William R. Martine, Allentown, PA (US);
Vipul P. Dholakia, Macungie, PA (US);
Hao Ding, Macungie, PA (US);
Gamini Ananda Vedage, Bethlehem, PA (US);
William R. Martine, Allentown, PA (US);
Vipul P. Dholakia, Macungie, PA (US);
Air Products and Chemicals, Inc., Allentown, PA (US);
Abstract
This invention relates to a process for the catalytic hydrogenation of impurity laden methylenedianiline feedstocks commonly referred to a MDA-50 and MDA-60. The process for hydrogenating methylenedianiline containing at least 40% oligomer function by weight comprises: contacting the feedstock with hydrogen in the presence of a rhodium/ruthenium containing catalyst system carried on a lithium aluminate support under conditions for effecting ring hydrogenation.