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. 25, 1999
Filed:
Aug. 11, 1998
Kazuyuki Hamada, Kurashiki, JP;
Satoru Komada, Yokohama, JP;
Asahi Kasei Kogyo Kabushiki Kaisha, Osaka, JP;
Abstract
A process for producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation, which comprises reacting propane or isobutane with ammonia and molecular oxygen in the gaseous phase in a fluidized-bed reactor containing a catalyst comprising a compound oxide and a silica carrier having supported thereon the compound oxide, wherein the compound oxide contains molybdenum (Mo), tellurium (Te), vanadium (V) and niobium (Nb), and wherein the reaction is performed with an addition of a catalyst activator comprising at least one tellurium compound and optionally at least one molybdenum compound into the reactor. The process of the present invention is advantageous in that the catalytic activity of the catalyst is surely maintained at a high level even without replacing the catalyst with a fresh one by interrupting the ammoxidation reaction, so that production of acrylonitrile or methacrylonitrile by the ammoxidation of propane or isobutane can be stably performed for a prolonged period of time while maintaining a high yield of acrylonitrile or methacrylonitrile.