米糠蜡非等温热分解动力学研究

STUDY ON NON-ISOTHERMAL THERMAL DECOMPOSITION KINETICS OF RICE BRAN WAX

采用差示扫描量热仪(DSC)测定了米糠蜡的相变温度、熔化温度、最终分解温度,结果表明:米糠蜡的最终熔化温度为82℃、分解温度为425℃;用TG/DSC分析仪在不同升温速率下对米糠蜡进行测试,Kissinger法得到米糠蜡热分解反应的表观活化能、反应级数等动力学参数,结果表明:米糠蜡在200℃以下具有良好的热稳定性,Kissinger法得到的米糠蜡表观活化能为167.43 kJ/mol,反应级数n为0.34.

In this study,we determined the phase transition temperature,melting temperature and final decomposition temperature of rice bran wax by differential scanning calorimetry （DSC）. The result showed that the final melting temperature of rice bran wax was 82 ℃ and the decomposition temperature was 425 ℃ We also tested rice bran wax by TG/DSC at different heating rates to obtain the kinetic parameters of apparent activation energy, reaction order and the like of thermal decomposition reaction of rice bran wax by Kissinger. The results showed that rice bran wax had good thermal stability below 200 ℃ ;and the apparent activation energy of rice bran wax was 167.43 kJ/mol, and the reaction order （n） was 0.34.