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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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The trends from this graph create clear distinctions in extraction rates as the 3.2 mL/min run has a faster extraction than the 1.26 mL/min run, and the 9 mL/min run is the fastest extraction of them all. At the twenty minute mark, the three runs are as follows, the 1.26 mL/min flow has 76.0% of the butanol left in the reactor while the 3.2 mL/min run has 58.2% of the initial butanol left in the reactor and the 9 mL/min run has 47.9% of the butanol left in the reactor. This shows that the 9 mL/min run has slightly over double the extraction rate as the 1.26 mL/min run when the mass flow rate is seven times larger. With this initial data it is clear there could be an increasing trend of extraction rate with mass flow rate of the scCO2 solvent. However, for this to be confirmed, a few more experiments should be run to determine if the data is reproducible and also whether this affect plateaus at some level. From a first glance, this data gives a positive look at how the mass flow rate can make this system more efficient. 4.3 Experimental Model The extraction rate of butanol, for varying concentrations, pressures and mass flow rates can be seen from the collected data in Figures 4.8, 4.12, and 4.13. Plotting the natural log of Ca divided by Co verse time, for varying concentration gives Figure 4.14. Figure 4.14: Finding the slope of ln(Ca/Co) for all 1 and 3 wt.% runs 46

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