Method for the purification of 4,4'-diamino-diphenylmethane
AssigneeSumitomo Chemical Company, Limited
InventorsTakahiro Yamamoto, Hirokazu Murata, Kiichi Hattori
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Abstract
A method of purifying 4,4'-diaminodiphenylmethane comprising partially melting a crystal of crude 4,4'-diaminodiphenylmethane and removing a melt to obtain a high purity 4,4'-diaminodiphenylmethane. By utilizing the method, a high purity 4,4'-diaminodiphenylmethane is obtained efficiently with a low level of energy consumption.
Claims13
A method for the purification of 4,4'-diaminodiphenylmethane comprising partially melting a crystal of crude 4,4'-diaminodiphenylmethane and removing a melt to obtain high purity 4,4'-diaminodiphenylmethane, wherein said crystal of crude 4,4'-diaminodiphenylmethane is prepared by reacting aniline and formaldehyde.
Dependencies are inferred from the claim text.