Chitin liquefaction and kinetics

doi:10.16085/j.issn.1000-6613.2017-0009

Abstract

Abstract: The factors affecting acid-catalyzed liquefaction of chitin were studied by single factor experiments. FTIR was used to examine the major functional groups of liquefied residues and products;SEM,XRD and TGA were employed to investigate the surface morphology,degree of crystallinity and thermostability of residues,respectively. A kinetic model was constructed and used to provide an insight into the relationship between reaction rate and residue content at different temperatures. The results indicated that a higher temperature,a larger catalyst dosage,or a longer reaction time was associated with a lower residue content. Kinetic studies revealed that a complex multistage reaction was involved in acid-catalyzed liquefaction of chitin,having an apparent activation energy E_a=34.5kJ/mol,a pre-exponential factor A=254.17s^-1,a mean enthalpy of activation △H_r=30.86kJ/mol,and a mean entropy of activation △S_r=-210J/mol. The reaction on the whole was endothermic and its apparent reaction rate constant increased with raising temperature. The reaction system changed orderly with the input of external energy.

Key words: biomass, chitin, liquefaction, kinetics

摘要： 通过单因素试验法对甲壳素的酸催化液化反应中的影响因素进行了探讨。结合红外光谱（FTIR）、热重分析（TGA）、X射线衍射（XRD）及扫描电子显微镜（SEM）等分析手段分别对液化残渣和液化物的主要官能团、热稳定性、结晶度及表面形貌特征进行了分析，并应用动力学模型探讨了不同温度下反应速率和残渣率的关系。结果表明升高温度、增加催化剂用量和延长反应时间均有利于降低残渣率；动力学研究表明甲壳素的酸催化液化为复杂的多级反应，活化能E_a=34.5kJ/mol，指前因子A=254.17s^-1，平均活化焓△H_r=30.86kJ/mol，平均活化熵△S_r=-210J/mol，整个反应为吸热反应，表观反应速率常数随着温度的升高而增加，在外界能量输入下，体系有序性发生变化。

关键词: 生物质, 甲壳素, 液化, 动力学

CLC Number:

TQ31

ZHANG Jie, XU Wenrong, ZHANG Yucang, LI Ruisong, MENG Fanrong. Chitin liquefaction and kinetics[J]. Chemical Industry and Engineering Progress, 2017, 36(08): 3085-3091.

张洁, 许文茸, 张玉苍, 李瑞松, 孟繁蓉. 甲壳素的液化反应及其动力学模拟[J]. 化工进展, 2017, 36(08): 3085-3091.

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