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Title:
METHOD FOR PRODUCING POLYSULFIDE BY USE OF ELECTROLYTIC OXIDATION
Document Type and Number:
WIPO Patent Application WO/2000/050340
Kind Code:
A1
Abstract:
A method for producing polysulfides which comprises introducing a sulfide ion-containing solution into an anode compartment of an electrolytic bath comprising an anode compartment having a porous anode, a cathode compartment having a cathode, and a diaphragm partitioning the anode compartment and the cathode compartment and effecting an electrolytic oxidation, to thereby produce polysulfide ions, characterized in that the porous anode is arranged in a manner such that an interstice is present between the porous anode and the diaphragm at least in a part of the diaphragm and an apparent volume of the porous anode is 60 % to 99 % relative to that of the anode compartment. The method can be used for producing a digesting solution having a high content of polysufide-sulfur, with markedly reduced by-production of a thiosulfate ion.

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Inventors:
SHIMOHIRA TETSUJI (JP)
ANDOH TATSUYA (JP)
TANAKA JUNJI (JP)
WATANABE KEIGO (JP)
NANRI YASUNORI (JP)
Application Number:
PCT/JP2000/001147
Publication Date:
August 31, 2000
Filing Date:
February 28, 2000
Export Citation:
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Assignee:
ASAHI GLASS CO LTD (JP)
KAWASAKI KASEI CHEMICALS (JP)
JUJO PAPER CO LTD (JP)
SHIMOHIRA TETSUJI (JP)
ANDOH TATSUYA (JP)
TANAKA JUNJI (JP)
WATANABE KEIGO (JP)
NANRI YASUNORI (JP)
International Classes:
C01B17/34; C25B1/00; C25B3/00; C25B11/03; D21C11/00; D21C11/04; (IPC1-7): C01B17/34
Domestic Patent References:
WO1997041295A11997-11-06
Foreign References:
US5624545A1997-04-29
US5653861A1997-08-05
Other References:
See also references of EP 1178009A4
Attorney, Agent or Firm:
Senmyo, Kenji (Kanda-Higashimatsushitacho Chiyoda-ku Tokyo, JP)
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