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... 02/181584'-diaminodiphenylmethane and its economic analysis of industrial production Optimization of synthetic route of 4