Ethyl esters from the single-phase base-catalyzed ethanolysis of vegetable oils

被引:132
作者
Zhou, WY [1 ]
Konar, SK [1 ]
Boocock, DGB [1 ]
机构
[1] Univ Toronto, Dept Chem Engn & Appl Chem, Toronto, ON M5S 3E5, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
base-catalyzed ethanolysis; biodiesel standards; canola and sunflower oils; one-phase transesterification;
D O I
10.1007/s11746-003-0705-1
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The effects of alcohol/oil molar ratio, base concentration, and temperature on the single-phase base-catalyzed ethanolyses of sunflower and canola oils were determined. The use of tetrahydrofuran as co-solvent, as well as higher than usual alcohol/substrate molar ratios, prevented glycerol separation. This allowed each reaction to reach equilibrium rather than just steady-state conditions. High conversions of oil lowered the concentrations of MG and DG surfactants in the products, and thereby mitigated the formation of emulsions usually associated with ethanolysis reactions. An alcohol/oil molar ratio of 25:1, together with the necessary amount of cosolvent, gave optimal results. At this molar ratio, despite equilibrium being achieved, ethanolysis, unlike methanolysis, did not quite produce biodiesel-standard material, the MG content being approximately 1.5 mass%. For methanolysis and 1-butanolysis, the corresponding values were 0.6 and 2.0 mass%, respectively. The use of 1.4 mass% KOH (equivalent to 1.0 mass% NaOH) led to ethanolysis equilibrium within 6-7 min at 23degreesC rather than 15 min when only 1.0 mass% was used. At 60degreesC, equilibrium was reached within only 2 min. Soybean and canola oils behaved the same.
引用
收藏
页码:367 / 371
页数:5
相关论文
共 10 条
[1]  
BALKANSKY GV, 1999, THESIS U TORONTO ONT
[2]   Fast formation of high-purity methyl esters from vegetable oils [J].
Boocock, DGB ;
Konar, SK ;
Mao, V ;
Lee, C ;
Buligan, S .
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, 1998, 75 (09) :1167-1172
[3]   Phase diagrams for oil/methanol/ether mixtures [J].
Boocock, DGB ;
Konar, SK ;
Sidi, H .
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, 1996, 73 (10) :1247-1251
[4]  
BOOCOCK DGB, 2001, P 1 WORLD C EXH BIOM, V1, P590
[5]   TRANSESTERIFICATION KINETICS OF SOYBEAN OIL [J].
FREEDMAN, B ;
BUTTERFIELD, RO ;
PRYDE, EH .
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, 1986, 63 (10) :1375-1380
[6]   QUANTITATION IN THE ANALYSIS OF TRANSESTERIFIED SOYBEAN OIL BY CAPILLARY GAS-CHROMATOGRAPHY [J].
FREEDMAN, B ;
KWOLEK, WF ;
PRYDE, EH .
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, 1986, 63 (10) :1370-1375
[7]   VARIABLES AFFECTING THE YIELDS OF FATTY ESTERS FROM TRANSESTERIFIED VEGETABLE-OILS [J].
FREEDMAN, B ;
PRYDE, EH ;
MOUNTS, TL .
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, 1984, 61 (10) :1638-1643
[8]   Biodiesel: The use of vegetable oils and their derivatives as alternative diesel fuels [J].
Knothe, G ;
Dunn, RO ;
Bagby, MO .
FUELS AND CHEMICALS FROM BIOMASS, 1997, 666 :172-208
[9]  
KORUS RA, 1993, 1 BIOM C AM BURL VT, V2, P815
[10]   Immobilized lipase-catalyzed ethanolysis of sunflower oil in a solvent-free medium [J].
Selmi, B ;
Thomas, D .
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, 1998, 75 (06) :691-695