Transesterification of soybean oil to biodiesel over kalsilite catalyst  

作　　者：Guang WEN Zifeng YAN 

机构地区：[1]School of Chemistry&Chemical Engineering,China University of Petroleum,Qingdao 266555,China

出　　处：《Frontiers of Chemical Science and Engineering》2011年第3期325-329,共5页化学科学与工程前沿（英文版）

摘　　要：The transesterification reaction of soybean oil with methanol over kalsilite-based heterogeneous catalysts was investigated.The kalsilite was synthesized from potassium silicate,potassium hydroxide,and aluminum nitrate aqueous solutions by controlling the pH value at 13.After calcination in air at 1200°C,a very porous kalsilite(KAlSiO4)was obtained with surface pores ranging from 0.2 to 1.0µm.However,this kalsilite had relatively low catalytic activity for the transesterification reaction.A biodiesel yield of 54.4%and a kinematic viscosity of 7.06 cSt were obtained at a high reaction temperature of 180°C in a batch reactor.The catalytic activity of kalsilite was significantly enhanced by introducing a small amount of lithium nitrate in the impregnation method.A biodiesel yield of 100%and a kinematic viscosity of 3.84 cSt were achieved at a temperature of only 120°C over this lithium modified catalyst(2.3 wt-%Li).The test of this lithium modified catalyst in pellet form in a laboratory-scalefixed-bed reactor showed that it maintained a stable catalytic performance with a biodiesel yield of 100%over thefirst 90 min.

关 键 词：kalsilite heterogeneous catalyst TRANSESTERIFICATION BIODIESEL 

分 类 号：O64[理学—物理化学]