Mitsubishi Paper Mills Limited

Chiyoda Chemical Engineering & Construction

Yoshihiro Ohguchi

Munekazu Nakamura

Takeo Ono

Tatsuo Morimoto

Masayoshi Inooka

Masatoshi Matsuda

Motoyoshi Wakabayashi

Masayuki Suzuki

Shinichi Hara

Masaaki Kasuya

Kuniaki Kimura

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.

Method of oxidizing sulfide-containing liquor

This invention relates to a catalyst for hydrotreatment of hydrocarbons comprising one or more of metals selected from the group consisting of transition metals and metals of group IIb of the periodic table supported on sepiolite. More particularly it relates to a catalyst effective in the selective demetallization treatment of hydrocarbons.

Demetallation of hydrocarbons with catalysts supported on sepiolite

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Ebina, Japan

Yoshihiro Ohguchi