Phthalic anhydride is catalysed similarly by VO-produced oxidation of ortho-xylene or naphthalene at 350 -- 400 ° C. The equation is for the xylene oxidation :
Phthalic anhydride is produced similarly by VO-catalysed oxidation of ortho-xylene or naphthalene at 350 -- 400 ° C. The equation is for the xylene oxidation :