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AssigneeMitsubishi Paper Mills Limited
InventorsMasayuki Suzuki, Shinichi Hara, Kuniaki Kimura, Takeo Ono, Munekazu Nakamura, Yoshihiro Ohguchi
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A method of treating an aqueous sodium sulfide solution, such as white liquor in kraft pulping systems, for the oxidation of the sulfide with oxygen in the presence of a specific activated carbon catalyst which is (a) a particulate activated carbon catalyst having an average particle diameter of 0.2-4 mm, a pore volume of at least 0.25 cc/g in pores with diameters of not smaller than 100 .ANG. and a pore volume of at least 35% of the total pore volume in pores with diameters of not smaller than 100 .ANG. or (b) a fibrous activated carbon catalyst having a specific surface area of 300-2500 m.sup.2 /g and an outer surface area of 0.1-5 m.sup.2 /g.
A method for the oxidation of sodium sulfide contained in an aqueous solution, comprising contacting the aqueous solution with an oxygen-containing gas and a catalyst consisting essentially of activated carbon to convert said sodium sulfide to polysulfide or sodium hydroxide in solution, said activated carbon catalyst being (1) a particulate catalyst having an average particle diameter of 0.2-4 mm, a pore volume of at least 0.25 cc/g in pores with diameters of not smaller than 100 .ANG. and a pore volume of at least 35% of the total pore volume in pores with diameters of not smaller than 100 .ANG. or (2) a fibrous catalyst having a specific surface area of 300-2500 m.sup.2 /g and an outer surface area of 0.1-5.0 m.sup.2 /g.
A process of treating an aqueous solution containing sodium sulfide and suspended solids, comprising the steps of:
Dependencies are inferred from the claim text.