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Lipase-catalyzed synthesis of oleyl oleate in pressurized and supercritical solvents
Krmelj, Vlasta ...
Supercritical and pressurized solvents were used as a biochemical reaction media. As a model system esterification of oleic acid with oleyl alcohol, catalyzed by lipase from Rhizomucor miehei was ...used. Due to the limitation of the process that may arise from the non-polarity of carbon dioxide, which preferentially dissolves hydrophobic compounds, studies were performed also with other gases (n-butane, n-propane, n-propane:n-butane mixture). The initial reaction rates at 20°C are in n-butane around 5 mmol/(g*h). They are approximately 2-3 times higher than in CO2. At 50°C the reaction rates in n-butane and in n-propane:n-butane mixture are higher in comparison with CO2 only at the pressure which is subcritical for CO2. The maximal initial reaction rate of 13mmol/(g*h) was observed in SC-CO2 at 250 bar and 50°C. The conversion of 87.1% was observed in n-butane at 20°C and 20 bar but the reaction time was 5h. 86% conversion was reached in only one hour at 50°C and 1000 bar in SC-CO2.
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