Abstract: Cyclohexene hydration is the mainstream process for the preparation of caprolactam,in which cyclohexene is made by hydrogenation of benzene.Trace sulfur in benzene may lead to poisoning of ruthenium catalyst for hydrogenation of benzene and affect the catalyst lifespan.A new packing scheme for benzene pretreatment desulfurization catalyst is proposed.The operating data of ruthenium desulfurization catalyst and palladium desulfurization catalyst are compared,and the regeneration scheme for ruthenium desulfurization catalyst is introduced.Current research status and development direction of ruthenium desulfurization catalyst are summarized and prospected.
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