news Optimization of synthetic route of 4,4′-diaminodiphenylmethane and its economic analysis of industrial production Introduction to 4,4'-diaminodimethane 4,4'-diaminodiphenylmethane (4,4'-Diaminodiphenylmethane, ref... 02/1824'-diaminodiphenylmethane and its economic analysis of industrial production Optimization of synthetic route of 4