Method for synthesizing 4, 4-diaminodicyclohexylmethane

The invention relates to a method for synthesizing 4, 4 '-diaminodicyclohexylmethane. 4, 4'-diaminodiphenylmethane is taken as a raw material, under the catalytic action of a graphene-loaded ruthenium catalyst, an alkaline earth metal compound serves as a cocatalyst, catalytic hydrogenation is carried out to obtain synthesized 4, 4'-diaminodicyclohexylmethane, the dosage of the catalyst is 2-15 wt%, preferably 4-6 wt%, of the raw material MDA, and the auxiliary agent can protect amino from falling off in a high-temperature and high-pressure reaction process, so that generation of side products is reduced. The graphene-loaded ruthenium catalyst is used as the catalyst, so that the selectivity is good, only a small amount of amino falls off under high-temperature and high-pressure conditions, and the conversion rate is high. Under the condition of ensuring the MDA conversion rate and the PACM selectivity, the content of the first isomer of the product PACM can reach about 70wt%. 本发明涉及一种合成4,4，－二氨基二环己基甲烷的方法，是以4,4