WERKWIJZE VOOR HET BEREIDEN VAN EEN MENGOXYDE-OXYDATIEKATALYSATOR OP BASIS VAN VANADIUM EN FOSFOR EN WERKWIJZE VOOR HET BEREIDEN VAN MALEINEZUURANHYDRIDE.

摘要

The process for the production of a mixed-oxide oxidation catalyst which, based on the vanadium and pentavalent phosphorus, has an atomic ratio of phosphorus to vanadium between 1.05 to 1 and 1.10 to 1. The process involves reacting a salt of tetravalent vanadium, dissolved in a non-oxidizing acid aqueous solution, with orthophosphoric acid. The resultant soluble vanadium salt complex, after concentrating the solution is precipitated by adding water. The precipitate is dried. The dried precipitate is put or formed into the desired form. The formed, dried precipitate is subjected to a heat treatment of at least 300 DEG C. A mixed-oxide oxidation catalyst is obtained.