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首页> 外文会议>Kraft pulp yield: a TAPPI Press anthology of published papers for the period of 1990-2001 >NEW PROCESS PRODUCES HIGHLY CONCENTRATED POLYSULFIDE LIQUOR BY ELECTROLYSIS OF WHITE LIQUOR
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NEW PROCESS PRODUCES HIGHLY CONCENTRATED POLYSULFIDE LIQUOR BY ELECTROLYSIS OF WHITE LIQUOR

机译：新工艺通过白液电解生产高浓度聚硫液

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摘要

A new electrolytic oxidation process to produce highly concentrated polysulfide (PS) liquor fromrnwhite liquor has been developed by the cooperative work of three Japanese companies.rnAdvantages of this process have been verified through long-term operation of a bench-scale cell.rnResults obtained with the specially designed electrolytic cell demonstrate that the system isrnsuitable for actual mill operation. The white liquor is oxidized electrically to produce PS liquorrnin the anode compartment, while sodium hydroxide is simultaneously formed in the cathoderncompartment. Because thiosulfate formation is suppressed in the electrochemical process, it wasrnpossible to produce highly concentrated PS liquor with efficient use of electrical current.rnConsequently, this process concentrates the sodium sulfide in the white liquor whilernsimultaneously producing highly concentrated PS liquor and purified sodium hydroxide, thusrnmaintaining the sulfur balance in the kraft pulping process. PS cooking of hardwoods wasrnevaluated in a laboratory digester using the oxidized PS liquor produced in a bench-scale cell.rnLarge increases of pulp yields and reductions in pulp kappa number were observed. Thesernresults suggest that the proposed process has the potential to improve pulp yield while reducingrnAOX (adsorbable organic halide). The application of this process to the modified kraft cookingrnprocess is also discussed.
机译：三家日本公司的合作开发了一种新的电解氧化法，可从白液中生产高浓度的多硫化物（PS）液.rn该方法的优势已通过台式规模电池的长期运行得到验证。专门设计的电解池证明该系统不适合实际工厂运行。将白液电氧化以在阳极室中产生PS液，同时在阴极室中同时形成氢氧化钠。由于在电化学过程中抑制了硫代硫酸盐的形成，因此无法有效利用电流来生产高浓度的PS液体。因此，此过程将硫化钠浓缩在白液中，同时生产高浓度的PS液体和纯化的氢氧化钠，从而维持了牛皮纸制浆过程中的硫平衡。在实验室蒸煮器中，使用台式规模的电解槽中产生的氧化PS液对硬木的PS蒸煮进行了重新评估。观察到纸浆产量大幅度提高，纸浆Kappa值降低。这些结果表明，所提出的方法具有提高纸浆产量同时降低AOX（可吸附有机卤化物）的潜力。还讨论了该方法在改进的牛皮纸蒸煮过程中的应用。

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