CAJ | 학술논문

采用热重分析法对生物油及其三种重质组分模型化合物的热解特性进行了对比研究,并对动力学参数进行了求解.结果表明:生物油的热解包括挥发组分的蒸发及重质组分的裂解两个阶段,反应级数都是4级,活化能分别为29～36kJ/mol及13～19 kJ/mol;三种重质组分模型化合物中左旋葡聚糖也存在两个失重区间,反应级数分别为1和2,且表观活化能最高;3,4二甲氧基苯甲醛和丁香酚则只有一个失重区间,且相应的反应级数分别为0.8和0.5,表观活化能也依次降低.
채용열중분석법대생물유급기삼충중질조분모형화합물적열해특성진행료대비연구,병대동역학삼수진행료구해.결과표명:생물유적열해포괄휘발조분적증발급중질조분적렬해량개계단,반응급수도시4급,활화능분별위29～36kJ/mol급13～19 kJ/mol;삼충중질조분모형화합물중좌선포취당야존재량개실중구간,반응급수분별위1화2,차표관활화능최고;3,4이갑양기분갑철화정향분칙지유일개실중구간,차상응적반응급수분별위0.8화0.5,표관활화능야의차강저.
The pyrolysis behaviors and kinetics of bio-oil and its model compounds of heavy fractions (Eugenol,Levoglucosan and 3,4-Dimethoxybenzaldehyde)are studied by thermogravimetric(TG) analysis.The curves of TG and corresponding DTG are analyzed.The results show that the pyrolysis of bio-oil consists of two stages,that is,the evaporation stage of volatile fractions and the decomposition stage of heavy fractions.Both of the two stages are fonr-order reactions,whereas their activation energy are 29-36 kJ/mol and 13-19 kJ/mol,respectively.Among three model compounds of bio-oil heavy fractions,there are two stages in the pyrolysis process of levoglucosan with different reaction order of land 2:while there are only one stage in that of 3,4-Dimethoxybenzaldehyde and Eugenol.with different reaction order of 0.8 and 0.5,respectively.The order of the activation energy of these compounds are that levoglucosan>3.4-Dimethoxybenzaldehyde>Eugenol.