摘要： 采用热失重技术在氮气气氛中对稻草类木质素进行非等温体系下热稳定性和热解特性进行分析。在不同升温速率下对稻草类木质素的热分解动力学通过单一升温速率法（Coats-Redfern法）、多重升温速率法、EDAM模型等模拟方法进行动力学方程及其热力学参数计算。研究结果表明，稻草类木质素热降解反应过程，随着升温速率的提高，逐渐向高温区移动，但最大失重速率均发生在 250℃～450℃之间。此外，基于不同动力学模拟方法所求算的稻草类木质素热力学参数有异，Coats-Redfern法拟合的热解反应动力学方程可用一级反应进行描述。
关键词： 稻草；酶解/酸解木质素；热解；动力学

LOU Rui^1,*， WU Shubin^2,， ZHAO Hongxia^1,， ZHANG Bin^1,

（  1、College of Mechanical and Electronic Engineering, Shaanxi University of Science and Technology, Xi`an 710021, China；       2、State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China；  ）

Abstract： The pyrolysis characteristics and thermostability of lignin isolated from rice straw was studied by thermogravimetric analysis under the nitrogen and non-isothermal system. The mechanism and kinetics of the thermal decomposition reaction of rice straw lignin were studied by means of the single heating rate method (Coats-Redfern method), multiple heating rate method, and EDAM, and though these to obtain the fitted lines of kinetic equations and thermodynamic parameters. The research results showed that the temperature intervals of the volatile release in the pyrolysis process shifted towards high-temperature region as the heating rates increased, while the maximum rate of weight loss occurred at the temperature range of 250℃ to 450℃. Moreover, the values of thermodynamic parameters had a greater difference during the varying model approachs, and the pyrolysis kinetic of rice straw lignin was described as a first-order reaction model according to Coats-Redfern method.
Keywords： straw; enzymatic/acidolysis lignin; pyrolysis; kinetics

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