초록 ▼

Spent hydrodesulfurization catalysts containing alumina, at least one metal from the group consisting of molybdenum, tungsten and vanadium and at least one metal from the group consisting of nickel and cobalt, sulfur, and, usually, residual oil are oxygen pressure leached at a temperature of at leas

Spent hydrodesulfurization catalysts containing alumina, at least one metal from the group consisting of molybdenum, tungsten and vanadium and at least one metal from the group consisting of nickel and cobalt, sulfur, and, usually, residual oil are oxygen pressure leached at a temperature of at least about 400°F. with a base from the group consisting of sodium hydroxide and sodium aluminte in at least stoichimetric amount to yield a solution having a pH between about 7 and 9 containing dissolved molybdenum, vanadium and any tungsten which may be recovered and a readily filterable residue containing aluminum, nickel and cobalt which may be worked up to recover the valuable constituents, with overall processing being accomplished in an environmentally acceptable manner.

대표청구항 ▼

The process for treating spent catalyst containing aluminum, molybdenum, vanadium, sulfur and at least one metal from the group consisting of nickel and cobalt with up to 30%, by weight, oil, to recover the constituents thereof which comprises the steps of: (a) slurry preparation wherein the said sp

The process for treating spent catalyst containing aluminum, molybdenum, vanadium, sulfur and at least one metal from the group consisting of nickel and cobalt with up to 30%, by weight, oil, to recover the constituents thereof which comprises the steps of: (a) slurry preparation wherein the said spent catalyst is mixed with an aqueous solution of at least one base from the group consisting of sodium hydroxide and sodium aluminate to emulsify any oil in said catalyst and to form a stable slurry; (b) oxygen pressure leaching the said slurry containing said base from the group consisting of sodium hydroxide and sodium aluminate at a temperature of at least about 300°F. to oxidize and dissolve molybdenum, vanadium and sulfur selectively from said catalyst as sodium molybdate, sodium vanadate and sodium sulfate, respectively, while retaining aluminum and any catalyst-contained nickel and cobalt in a residue; (c) discharging the products of said oxygen pressure leach at a pH not exceeding about pH 9; and (d) separating the aqueous solution containing said molybdenum, vanadium and sulfur but less than 100 ppm aluminum from said residue.