Nippon Chemical Industrial Co., Ltd.

Kosei Co., Ltd.

Other

Sumitomo Electric Industries, Limited

Honda Giken Kogyo Kabushiki Kaisha

The Kansai Electric Power Co., Inc.

Muneo Mita

Ken Horikawa

Yasuyuki Tanaka

Michiru Kubata

Nobuyuki Tokuda

Tetsuya Osaki

Kouji Kashiwase

Takahiro Naka

Yoshikazu Fujisawa

Tetsuo Endo

Haruhiko Shimizu

Tsunenosuke Hiramatsu

Taijiro Okabe

Toshihiko Morishita

Kenji Agemoto

Eiichi Narita

Yoshiharu Kobayashi

Kohji Kashiwase

Yasuo Machino

Mitsuo Taniguchi

Hidehiro Nakao

Katsuhiro Tashiro

Masayuki Furuya

A modified vanadium compound characterized in that vanadium sulfate (III), or a mixed vanadium compound of vanadium sulfate (III) and vanadyl sulfate (IV) contains excessive sulfuric acid other than sulfate group composing the vanadium sulfate (III) or the vanadyl sulfate (IV), and when the modified vanadium compound is used, a redox flow battery electrolyte can be prepared easily.

Modified vanadium compound, producing method thereof, redox flow battery electrolyte composite and redox flow battery electrolyte producing method

The present invention provides method of producing a trivalent and tetravalent mixed vanadium compound having excellent solubility with sulfuric acid directly from a tetravalent or pentavalent vanadium compound by using a reducing agent,and a method of producing a vanadium electrolyte. For example, a vanadium compound mainly containing a pentavalent vanadium compound; sulfur and concentrated sulfuric acid in molar ratios with respect to (one mol of vanadium atom in the pentavalent vanadium compound) 0.35 to 0.4:1.2 to 1.9 are kneaded into paste form, and the paste-form mixture is calcined at a temperature of not less than 150&deg; C. to less than 440&deg; C. so that a trivalent and tetravalent mixed vanadium compound is obtained, and a redox flow battery-use vanadium electrolyte is obtained by dissolving the trivalent and tetravalent mixed vanadium compound in a sulfuric acid solution.

Trivalent and tetravalent mixed vanadium compound producing method and vanadium electrolyte producing method

A method of circulating an electroless nickel plating solution is characterized in that the system comprises the following process steps effected in the following order: (A) a step of electrolessly plating nickel using a plating solution having nickel hypophosphite contained as a chief chemical material for supplying a plating metal ion Ni,and a hypophosphorous acid ion H,PO,acting as a reducing agent; (B) a step of removing HPO,from a plating solution that has aged in the step (A); (C) a step of desalting the mother liquor separated from the step (B); and (D) a step of adjusting the components of the treated plating solution and then circulating same back into the step (A) of electroless nickel plating. According to the present invention, the plating solution is free from the formation and accumulation of a sulfuric acid salt and hence a long service life is ensured and a great advantage in environmental protection is provided.

Method for circulating electroless nickel plating solution

Heat-resistant HC adsorbent

This invention provides an additive for resins prepared by mixing (i) an A-type zeolite having a substantially spherical form and a median particle size not larger than 5 .mu.m or an acid treated product thereof, and (ii) fine amorphous silica. The additive has high lubricating qualities and free-flowing properties. A resin composition comprising said additive shows good heat stability, antioxidizing and antiblocking properties.

Additives for resins and their compositions

Additives for resins and their composition

A stabilizer for use in a halogen-containing resin is described comprising a crystalline aluminosilicate substituted with ions of a metallic element belonging to Group II or Group IVA of the Periodic Table for Group I (M) metal ion contained in said aluminosilicate and containing 10% by weight of less, as M.sub.2 O, of residual Group I metal ions.

Metal substituted zeolites as stabilizers for halogen-containing resins

A high-pure alkali permanganate is produced at a high yield by electrolytically oxidizing at a temperature of higher than 60.degree. C a caustic alkali slurry of manganese dioxide and/or an alkali penta-valent manganate having a caustic alkali concentration of 10 to 25% by weight.

Process for the production of alkali permanganate

Growing community of inventors

Tokyo, Japan

Muneo Mita