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首页> 外文会议>TAPPI pulping conference >ACHIEVING MAXIMUM PEROXIDE BLEACHING RESPONSE THROUGH PROPER SELECTION OF pH: A Comparison of Decomposition and Bleaching Reaction Rates
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ACHIEVING MAXIMUM PEROXIDE BLEACHING RESPONSE THROUGH PROPER SELECTION OF pH: A Comparison of Decomposition and Bleaching Reaction Rates

机译：ACHIEVING MAXIMUM PEROXIDE BLEACHING RESPONSE THROUGH PROPER SELECTION OF pH: A Comparison of Decomposition and Bleaching Reaction Rates

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摘要

Hydrogen peroxide bleaching performance can be significantly improved by using higher temperature pressurized peroxide bleaching systems. Higher temperatures also have the disadvantage of increasing the rate of peroxide decomposition, thus leading to lower brightnesses and lower pulp viscosities. The rates of both peroxide decomposition and peroxide bleaching of kraft pulp are strongly dependent on the pH of the bleaching liquor. The optimum balance at which decomposition reactions dominate over bleaching reactions at various temperatures will determine the potential success in any peroxide or pressurized peroxide bleaching process. This work compares the rates of chromophore elimination and delignification to the rates of peroxide decomposition and viscosity loss. The pH at which a peroxide stage is run strongly influences the overall selectivity of the process at a given temperature. An empirical kinetic model for peroxide bleaching has shown that the activation energy for brightening is higher than for decomposition.
机译：通过使用较高温度的过氧化物漂白系统可以显着提高过氧化氢漂白性能。较高的温度也具有增加过氧化物分解率的缺点，从而导致较低的亮度和较低的纸浆粘度。牛皮纸的过氧化物分解和过氧化物漂白的速率强烈依赖于漂白液的pH。分解反应在各种温度下漂白反应占漂白反应的最佳平衡将决定任何过氧化物或加压过氧化物漂白过程的潜在成功。这项工作比较了发色团消除和脱烃的速率，以对过氧化物分解和粘度损失的速率。过氧化物阶段的pH强烈影响在给定温度下该方法的总体选择性。过氧化物漂白的经验动力学模型表明，用于亮化的激活能量高于分解。

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