New process of producing highly concentrated polysulfide liquor by electrolysis of white liquor, 2002 Kraft Pulp Yield Anthology

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A new electrolytic oxidation process to produce highly concentrated polysulfide (PS) liquor from the white liquor has been developed by a cooperative work of three Japanese companies. Advantages of this process have been verified through a long-term operation by using the bench scale cell. A specially-designed electrolytic cell makes the system suitable for actual mill operation. The white liquor is oxidized electrically to produce PS liquor in the anode compartment, while sodium hydroxide is formed in the cathode compartment simultaneously. Since the undesirable thiosulfate formation is easy to control in the electrochemical process, it was possible to produce highly concentrated PS liquor with a good current efficiency.