FIELD: pulp-and-paper industry. SUBSTANCE: apparatus has cooking reactor with sulfate alkali and lignocellulose material, DC source and electrodes which are in contact with sulfate alkali. Capacitor is connected in parallel with DC source. Electrodes are arranged so that air gap is defined between them. Apparatus provides intensified process of oxidation of sulfate alkali and production of polysulfide solution. Process is conducted without usage of catalyst. EFFECT: increased efficiency, reduced power consumption and increased yield of finished product. 4 cl, 3 dwg
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