Kinetic parameters affecting the alkali-catalyzed transesterification process of used olive oil

被引:119
作者
Dorado, MP
Ballesteros, E
Mittelbach, M
López, FJ
机构
[1] Univ Jaen, Dept Mech & Min, Jaen 23700, Spain
[2] Univ Jaen, Dept Phys & Analyt Chem, EUP Linares, Jaen 23700, Spain
[3] Graz Univ, Inst Chem, A-8010 Graz, Austria
[4] Univ Cordoba, Dept Agr Engn, E-14080 Cordoba, Spain
关键词
D O I
10.1021/ef034088o
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In this study, chemical parameters involved in waste olive oil transesterification were investigated and optimized. Better results were obtained using KOH and methanol instead of NaOH and ethanol, which decreases transesterification rates. The presence of KOH and methanol above or below the optimum quantity decreases the ester yield because of the presence of soaps or unreacted glycerides, respectively. Settling at ambient temperature under 25 degreesC increases the difficulty of ester and glycerol separation because of a conflict between glycerol solubility and low temperatures. This could be solved by increasing the settling temperature or the time for settling. In summary, the reaction was optimized at ambient temperature using 1.26% KOH, 12% methanol, 1 min of stirring, with 90 min of pour-off time, 11.38% distilled water by volume at 25 degreesC to purify the ester, and drying over 0.5% Na2SO4. Losses of esters during the washing process were less than 4%. The ester yield of the reaction was 94%. The small presence of unreacted glycerides did not drop the engine performance. Fuel specifications were close to those of diesel fuel, thus indicating that methyl esters from used olive oil can be considered as a fuel candidate.
引用
收藏
页码:1457 / 1462
页数:6
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