Kulkarni Mangesh G, Dalai A K, Bakhshi N N
Department of Chemical Engineering, Catalysis and Chemical Reaction Engineering Laboratories, University of Saskatchewan, Research Annex Bldg., Saskatoon, SK, Canada S7N 5C5.
Bioresour Technol. 2007 Jul;98(10):2027-33. doi: 10.1016/j.biortech.2006.08.025. Epub 2006 Oct 27.
Transesterification of canola oil was carried out with methanol, ethanol, and various mixtures of methanol/ethanol, keeping the molar ratio of oil to alcohol 1:6 and using KOH as a catalyst. Mixtures of alcohol increased the rate of transesterification reaction and produced methyl as well as ethyl esters. The increased rate was result of better solubility of oil in reaction mixture due to better solvent properties of ethanol than methanol and equilibrium due to methanol. With 3:3 molar ratio of methanol to ethanol {MEE (3:3)} the amount of ethyl ester formed was 50% that of methyl ester. Properties (acid value, viscosity, density) of all esters including mixed esters were within the limits of ASTM standards. Lubricities of these esters are in the order: ethyl ester>methyl ethyl ester>methyl ester.
用甲醇、乙醇以及甲醇/乙醇的各种混合物对菜籽油进行酯交换反应，保持油与醇的摩尔比为1:6，并使用氢氧化钾作为催化剂。醇的混合物提高了酯交换反应的速率，并生成了甲酯和乙酯。反应速率的提高是由于乙醇比甲醇具有更好的溶剂性能，使得油在反应混合物中的溶解度更高，以及甲醇导致的平衡作用。在甲醇与乙醇的摩尔比为3:3 {MEE (3:3)} 时，形成的乙酯量为甲酯量的50%。所有酯（包括混合酯）的性质（酸值、粘度、密度）均在ASTM标准范围内。这些酯的润滑性顺序为：乙酯>甲乙酯>甲酯。
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