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Priority to JP11895276ApriorityCriticalpatent/JPS5344453A/ja
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Publication of JPS5520787B2publicationCriticalpatent/JPS5520787B2/ja
Wiederbelebung eines phosphorvanadium enthaltenden katalysators und dessen herstellungsverfahren, katalysator zur herstellung von maleinesaeureanhydrid, der mit phosphorsaeurealkylestern in anwesenheit von wasser behandelt worden ist.