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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Figure 4.12: Extraction results for system operating at 1 wt.% and 1500-2000 PSI Looking at the final graph to compare all of the pressure changes it can be seen that there is no significant change in extraction rate with a change in pressure. The overlap of the majority of the points indicates pressure change is not having an impact on the extraction rate. If there is an impact on the system due to pressure it is negated by multiple factors because the data collected does not reflect meaningful changes. Further investigation into these trends could be done to generate more reliable and repeatable data, however these initial studies show no general trend. Pressure has little affect on extraction rate. Changing Mass Flow Rate of scCO2 The final parameter of the system varied was the mass flow rate of scCO2. The goal of this test was to see if changing the mass flow rate of the scCO2 would affect the extraction rate of the system. These parameters were only tested in one trial each and the other variables were held constant at an initial butanol concentration of 1 wt.% and a pressure of 1500 PSI. The mass flow rate of the system was changed twice from 1.26 mL/min to 3.2 mL/min and 9.0 mL/min and this raw data can be seen in Figure 4.13. Figure 4.13: Mass flow rate of scCO2 changes for system operating at 1 wt.% and 1500-2000 PSI 45

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