Hydroconversion process using a sulfided molybdenum catalyst concentrate

Claim 1

A process for converting a carbonaceous chargestock comprising a hydrocarbon to produce lower boiling products which process comprises reacting said carbonaceous chargestock with hydrogen at a hydrogen partial pressure from about 50 to about 5000 psig at a temperature from about 800° to about 900° F. in the presence of a catalyst concentrate having been prepared by the steps which comprise: (a) forming a mixture of hydrocarbonaceous oil comprising constituents boiling above about 1050° F. and said aqueous solution of phosphomolybdic acid in an amount to provide from about 0.2 to 2 weight percent molybdenum, calculated as elemental molybdenum, based on said hydrocarbonaceous oil to produce a water-containing catalyst precursor concentrate; (b) drying said water-containing catalyst precursor concentrate to remove said water and produce a substantially water-free catalyst precursor concentrate; (c) contacting said water-free catalyst precursor concentrate with added hydrogen sulfide at a temperature from about 50° to about 600° F. and a hyrogen sulfide partial pressure ranging from about 14.7 psia to about 100 psia to produce a sulfided catalyst precursor concentrate; (d) separating the unreacted hydrogen sulfide from the sulfided catalyst precursor concentrate; (e) heating said sulfided catalyst precursor concentrate, in the absence of hydrogen sulfide and in the absence of hydrogen, at a temperature of at least about 650° F. and a total pressure ranging from about 0 to about 100 psig, for a time sufficient to convert said sulfided catalyst precursor to a solid molybdenum-containing catalyst and, thereby, produce a catalyst concentrate.