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:
Jul. 17, 2001
Filed:
Oct. 28, 1999
Marie-Christine Cotting, Bron, FR;
Laurent Gilbert, Lyon, FR;
Nathalie Laurain, Lyon, FR;
Christophe Nedez, Asnieres-sur-Seine, FR;
Rhoneapoulenc Fiber & Resin Intermediates, Courbevoie Cedex, FR;
Abstract
The present invention includes a process for the preparation of a lactam by vapor phase reaction of an aliphatic aminonitrile with water in the presence of a solid catalyst, wherein the catalyst is an alumina having a specific surface, measured by the BET method, greater than or equal to 10 m,/g. The alumina catalyst is further characterized by either: (a) a specific surface less than or equal to 280 m,/g, and a volume of pores with a diameter greater than 500 Å which is greater than or equal to 10 ml/100 g; or (b) a specific surface greater than or equal to 50 m,/g and less than or equal to 280 m,/g, and a volume of pores with a diameter greater than 70 Å which is greater than or equal to 30 m,/g.