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Effect of Ethanol on Decomposition Law of Hydrogen Peroxide during Bleaching of High-yield Bamboo Pulp
Received:April 03, 2023  
DOI：10.11980/j.issn.0254-508X.2023.11.010
Key Words:ethanol  reaction kinetics  H2O2 bleaching  high yield bamboo pulp
Fund Project:兴辽英才计划特聘教授项目（XLYC1802025）。
Author NameAffiliationPostcode
WANG Yutong* School of Light Industry and Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 116034
PING Qingwei School of Light Industry and Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 116034
LI Zixin School of Light Industry and Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 116034
NIU Meihong School of Light Industry and Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 116034
SHENG Xueru School of Light Industry and Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 116034
LI Na School of Light Industry and Chemical Engineering， Dalian Polytechnic University， Dalian， Liaoning Province， 116034 116034
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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%.
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