Patent
Process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid and its 1,8-monoanhydride in a high degree of purity (US Patent 4599431)
Hoechst Aktiengesellschaft · Granted Jul 8, 1986 · Filed Jul 5, 1984
Patent number: 4599431 Granted: 1986-07-08 Filed: 1984-07-05 Inventors: Siegfried Schiessler (Bad Soden am Taunus, DE); Ernst Spietschka (Idstein, DE) Assignees: Hoechst Aktiengesellschaft (Frankfurt am Main, DE)
Abstract
Process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid (called "NTC" below) and its 1,8-monoanhydride in a high degree of purity, which comprises dissolving impure NTC or impure NTC-1,8-monoanhydride as the
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