Kinetics of Transesterification Reaction Catalyzed by Solid Base in Fixed Bed Reactor
Kinetics of transesterification reaction catalyzed by solid base in fixed bed reactor was studied in this paper. The transesterification reaction between palm oil and methanol was catalyzed by KF/Ca-Mg-Al hydrotalcite solid base, which made it a complicated liquid-liquid-solid heterogeneous reaction. Isopropyl ether was used to obtain homogeneous reactant system, then liquid-liquid mass transfer limitations were eliminated. Experimental results showed that when the feed rate was faster than 0.3mL/min, liquid-solid external diffusion mass transfer limitations were negligible and while the diameter of catalyst particle was not larger than 0.18 mm, liquid-solid internal diffusion mass transfer limitations could be neglected as well. Then intrinsic reaction rates of this transesterification under different space velocity, temperature, and concentration were measured in fixed bed integral reactor. An intrinsic kinetic model was developed based on Eley-Rideal mechanism in the liquid phase according to the experimental data, which indicated a new mechanism of transesterification reaction catalyzed by solid base. The transesterification reaction occurred between methanol adsorbed on solid base active sites and glyceride from the liquid phase. The surface reaction of triglyceride with adsorbed methanol was assumed to be rate-determining. The model calculation agreed well with experimental data. Regression of experimental data indicated that the transesterification reaction was an endothermic reaction and the activation energy was 111.6 kJ/mol.
biodiesel kinetics transesterification solid base fixed bed reactor
Yang XIAO Li-jing GAO Guo-min XIAO Jian-hua LV
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People’s Republic of China
国际会议
南京
英文
102-109
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）