Prevulcanization of catalyst

The prevulcanization of catalyst is the key step to start the hydrogenation catalyst. Almost all hydrogenation catalysts use prevulcanization technology. Because metal sulfide is easy to burn, difficult to transport and store, so hydrogenation catalyst into the refinery, most of its metal components exist in the form of oxides, hydrogenation activity is low, only converted into sulfide form, has a high hydrogenation activity. Prevulcanization is in the presence of hydrogen, the catalyst in the active metal oxide and hydrogen sulfide reaction, into sulfide. There are many forms of metal sulfide, but in the process of prevulcanization in industrial installations, MoS2, WS2, Co9S8, Ni3S2 are used to calculate the sulfur content required for vulcanization.

Hydrogenation catalyst prevulcanization can be divided into internal and external two ways Prevulcanization is to first fill the oxidized hydrogenation catalyst into the hydrogenation reactor, then through hydrogen and curing agent or hydrogen and raw oil containing curing agent for prevulcanization. External prevulcanization is to combine the oxidized hydrogenation catalyst with the curing agent and then load it into the reactor. Hydrogen or hydrogen and raw oil are used for prevulcanization.