甲壳素的液化反应及其动力学模拟

发布时间：2018-05-04 20:11

本文选题：生物质 + 甲壳素　；参考：《化工进展》2017年08期

【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Ea=34.5kJ/mol,指前因子A=254.17s~( 1),平均活化焓ΔHr=30.86kJ/mol,平均活化熵ΔSr=-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。
[Abstract]:The influencing factors of acid-catalyzed liquefaction of chitin were investigated by single factor test. The main functional groups, thermal stability, crystallinity and surface morphology of liquefaction residue and liquefaction were analyzed by means of FTIR, TGA and XRD, and scanning electron microscope (SEM), respectively. The relationship between reaction rate and residue rate at different temperatures was discussed by using kinetic model. The results showed that increasing the temperature, increasing the amount of catalyst and prolonging the reaction time were all beneficial to reduce the residue rate, and the kinetic study showed that the acid catalyzed liquefaction of chitin was a complex multistage reaction. The activation energy (EA) is 34.5kJ / mol, the preexponential factor An 254.17s ~ (-1), the average activation enthalpy 螖 H ~ (r) ~ (30) 86kJ / mol, the average activation entropy 螖 Sr ~ (2 +) -210J / mol, the whole reaction is endothermic reaction, the apparent reaction rate constant increases with the increase of temperature, and the order of the system changes with the input of external energy.
【作者单位】：海南大学材料与化工学院热带岛屿资源先进材料教育部重点实验室;
【基金】：海南省科技项目(ZDYF2017005) 海南省高等学校科学研究项目(Hnky2017-13) 海南省研究生创新科研课题(Hys2016-01)项目
【分类号】：O636.1

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