Patent
Process for producing pyromellitic anhydride (US Patent 6452021)
Nippon Shokubai Co., Ltd. · Granted Sep 17, 2002 · Filed Sep 27, 2001
Patent number: 6452021 Kind code: B1 Granted: 2002-09-17 Filed: 2001-09-27 Inventors: Tsukasa Takahashi (Himeji, JP); Yasuhisa Emoto (Hyogo, JP); Etsushige Matsunami (Himeji, JP) Assignees: Nippon Shokubai Co., Ltd. (Osaka, JP)
Abstract
The present invention has for its object to provide a production method of pyromellitic anhydride of high purity in good yield at low cost by catalytic gas-phase oxidation of a 2,4,5-trialkylbenzaldehyde with the aid of a suitable catalyst system. The present invention relates to a
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