Method for producing polysulfides by means of electrolytic...

Details Method for producing polysulfides by means of electrolytic... Method for producing polysulfides by means of electrolytic...

C - Chemistry, Metallurgy

25

B

C25B 1/00 (2006.01) C01B 17/34 (2006.01) C25B 11/03 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2364242

The present invention has an object to obtain a cooking liquor containing polysulfide-sulfur at a high concentration by minimizing by-production of thiosulfate ions. The present invention is a method for producing polysulfides, which comprises introducing a solution containing sulfide ions into an anode compartment of an electrolytic cell comprising the anode compartment provided with a porous anode, a cathode compartment provided with a cathode, and a diaphragm partitioning the anode compartment and the cathode compartment, for electrolytic oxidation to obtain polysulfide ions, characterized in that the porous anode is disposed so that a space is provided at least partly between the porous anode and the diaphragm, and the apparent volume of the porous anode is from 60% to 99% based on the volume of the anode compartment.

L'invention concerne un procédé de production de polysulfures, consistant à introduire une solution contenant des ions sulfure dans un compartiment à anode d'une cuve à électrolyse qui comprend un compartiment à anode présentant une anode poreuse, un compartiment à cathode présentant une cathode, et une membrane séparant le compartiment à anode et le compartiment à cathode, pour produire ainsi des ions polysulfure. Ce procédé est caractérisé en ce que l'anode poreuse est placée de manière à permettre la création d'un interstice entre l'anode poreuse et la membrane, au moins dans une partie de cette dernière, et en ce que le volume apparent de l'anode poreuse représente 60 % à 99 % de celui du compartiment à anode. Ce procédé peut être mis en oeuvre pour produire une solution de digestion présentant une teneur élevée en polysulfure-soufre, la présence d'ion thiosulfate comme sous-produit étant nettement réduite.

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