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US5312989A Method for the purification of 4,4'-diamino-diphenylmethane 失效
4,4'-二氨基 - 二苯基甲烷的纯化方法

Method for the purification of 4,4'-diamino-diphenylmethane
摘要:
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.
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