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Extraction of Bio-Butanol using Supercritical Carbon Dioxide

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Extraction of Bio-Butanol using Supercritical Carbon Dioxide ( extraction-bio-butanol-using-supercritical-carbon-dioxide )

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supercritical state due to its high increase in density (Tai & Wu, 2005). This density increase was vital in our assumption of a liquid-liquid extraction scenario for our system of water-butanol-supercritical carbon dioxide components. After the liquid-liquid extraction assumption was made, research into correlations for similar systems was completed to finalize the equations used for which calculations. The variables, Kl and a, were calculated separately because the correlation for Kl was initially discovered in a text called Diffusion: Mass Transfer in Fluid Systems where Edward Cussler, the author, predicted Kl was based off of a series of different scenarios that could be applied to our system (Cussler, 2009). Multiple correlations were taken from the text and used to find the overall Kla value. All of the correlations contained an assumed interfacial area value that was calculated by adding the cross sectional area of the reactor and the surface area of the bubbles. This was considered reasonable because the interfacial area is created by the cross sectional area between the two phases and the surface area of the bubbles moving through the water phase. Then correlations for the interfacial area were investigated in literature to find an equation that would produce the assumed interfacial area used in the initial Kla calculation. 35

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