Patent
Production method of pyromellitic acid and pyromellitic anhydride (US Patent 7202380)
Mitsubishi Gas Chemical Company, Inc. · Granted Apr 10, 2007 · Filed Jan 13, 2004
Patent number: 7202380 Kind code: B2 Granted: 2007-04-10 Filed: 2004-01-13 Inventors: Tatsuyuki Kumano (Okayama, JP); Seiji Adachi (Okayama, JP); Hiroshi Ogawa (Okayama, JP) Assignees: Mitsubishi Gas Chemical Company, Inc. (Tokyo, JP)
Abstract
In a method of producing pyromellitic acid by liquid-phase oxidizing 2,4,5-trimethylbenzaldehyde in a water solvent with molecular oxygen, a recrystallization mother liquor separated in a recrystallization step is recycled to the oxidation step after a part of
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