Patent
Process for producing pyromellitic dianhydride (US Patent 4925957)
Kawasaki Steel Corp. · Granted May 15, 1990 · Filed Feb 22, 1989
Patent number: 4925957 Granted: 1990-05-15 Filed: 1989-02-22 Inventors: Norihide Enomoto (Chiba, JP); Yoshihiro Naruse (Chiba, JP) Assignees: Kawasaki Steel Corp. (Kobe, JP)
Abstract
A catalyst comprising an inert support that carries on it vanadium oxide, sodium oxide and molybdenum oxide in predetermined amounts, at least one additional component in a predetermined amount which is selected from among chromium oxide, manganese oxide, niobium oxide and titanium oxide is capable of producing pyromellitic dianhydride in
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