PROCESS AND COMPOSITION FOR PREVENTING DISCOLOURATION OF MALEICANHYDRIDE

摘要

Iron- and/or vanadium compounds are added to a stock solution made of copper compound and a solution of maleic anhydride in a concentration 0.1-0.5 % and this solution is added to maleic acid in such a way that it should not advance the melting point of the anhydride by more than 10 deg C.