高得率竹浆漂白中乙醇对H2O2分解规律的影响

Effect of Ethanol on Decomposition Law of Hydrogen Peroxide during Bleaching of High-yield Bamboo Pulp

关键词:  乙醇  反应动力学  H₂O₂漂白  高得率竹浆

Key Words:ethanol  reaction kinetics  H₂O₂ bleaching  high yield bamboo pulp

摘要:本研究采用气量法研究了乙醇介质抑制H₂O₂无效分解的机理和提高高得率竹浆漂白的效果。主要探讨了乙醇质量分数、反应温度等参数对分解反应速率常数（k）和反应活化能（Ea）的影响规律，并对比了乙醇介质对漂白高得率竹浆的白度、返黄值和机械强度的影响。结果表明，乙醇介质通过降低k值和Ea值可以有效抑制H₂O₂的无效分解；乙醇质量分数升高，抑制H₂O₂分解能力增强，质量分数50%的乙醇抑制效果较好；与水介质相比，高得率竹浆在50%乙醇-水介质中进行H₂O₂漂白，漂后浆白度提高了117.4%，返黄值下降了72.2%，纸张抗张指数提升了60.9%。

Abstract:The mechanism of inhibiting the ineffective decomposition of H₂O₂ by ethanol medium and improving the bleaching effect of bamboo high-yield pulp were studied by gas method. The influences of ethanol concentration， reaction temperature and other parameters on decomposition rate constant （k） and activation energy （Ea） were investigated， and the effects of ethanol medium on whiteness， yellowing value and mechanical strength of bamboo high-yield bleaching pulp were compared. The results showed that the ethanol medium could effectively inhibit the ineffective decomposition of H₂O₂ by reducing k value and Ea value. With the increase of ethanol concentration， the inhibition ability of H₂O₂ decomposition was enhanced， and the inhibition effect of 50% ethanol concentration was better. Compared with water medium， H₂O₂ bleaching in 50% ethanol-water medium increased the whiteness of pulps by 117.4%， the yellowing value decreased by 72.2%， and the paper tensile index increased by 60.9%.