【摘要】 采用热重分析法对不同钾盐用量下的烟草薄片纸基的热解特性进行了研究,并根据微分热重曲线,建立了动力学模型,计算了热解反应的动力学参数。结果表明:200~500℃是烟草薄片纸基热解的主要阶段;随着钾盐用量的增加,烟草薄片纸基最大失重峰温提前,未添加钾盐的对照组最大失重峰温为352.1℃,而当钾盐质量分数增加到2.0%时,最大失重峰温降低到319.8℃。根据Coats-Redfern法,不同用量下烟草薄片纸基的主要失重阶段可用一个一级反应表示,随着钾盐用量的增加,活化能有所降低,未添加钾盐的对照组活化能是35.21 kJ/mol,当钾盐的含量添加到2.0%,活化能降低为27.84 kJ/mol。更多还原

【Abstract】 The pyrolysis characteristics of reconstituted tobacco paper-base with different dosage of citric acid potassium were investigated by means of thermogravimetry. A dynamic model describing the pyrolysis process was established according to the differential thermogravimetric curves,and the corresponding kinetic parameters were calculated. The results showed that the pyrolysis of reconstituted tobacco paper-base mainly occurred at 200- 500 ℃. The weight loss peak moved forward with the increasing potassium dosage,and the weight loss peak temperature of the control group was 352. 1 ℃,while it reduced to319. 8 ℃ as 2. 0% potassium citrate was added. According to the Coats-Redfern method,the pyrolysis of reconstituted tobacco paper-base could be described by a first-order reaction,and the activation energy of the control sample was 35. 21 kJ/mol. On the other hand,when the sample as 2. 0% potassium citrate was added,it represented 27. 84 kJ/mol.更多还原