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- W1997668399 abstract "The synthesis of butyl laurate from butanol and lauric acid has been examined in near-critical carbon dioxide using a crude lipase enzyme (Candida Lipase B). The effects of temperature, pressure, and humidity have been studied by comparing rate profiles with a standard set of conditions (T = 40°C, P = 300 bar) in a high-pressure, fixed-bed reactor. The reaction showed an optimum temperature regime of approximately 40°C. Increasing the pressure to 500 bar did not significantly affect the reaction, but a lower rate was observed on reducing the pressure to 150 bar. In the absence of added water, the performance of the enzyme in supercritical carbon dioxide is comparable with that in toluene but less than that in hexane under equivalent conditions of temperature and pressure. When loss of water from the enzyme is eliminated by saturating the supercritical fluid with water, the rate in carbon dioxide exceeds that in hexane. The enhanced reaction rate in a low-viscosity supercritical fluid can be explained in terms of more rapid diffusion of reactants in the enzyme bed." @default.
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- W1997668399 date "1991-03-01" @default.
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- W1997668399 title "Biotransformations in near-critical carbon dioxide" @default.
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- W1997668399 doi "https://doi.org/10.1016/0141-0229(91)90132-t" @default.
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