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Chapter 3: Methodology 3.1 Reactor Our team designed an experimental plan for the trials we conducted to test different variables: temperature, pressure, and scCO2 flow rate. We created a set-up procedure to prepare the system for a run. We followed instructions and steps in order to consistently take samples from the system to analyze. Finally we documented our shutdown procedure to safely depressurize and clean the reactor. 3.1.1 Experimental Plan Pressures Our team varied the pressure at which the reactor functioned to see the effect of pressure on the mass transfer coefficient. The system was run as a semi-batch system, with supercritical carbon dioxide flowing into the reactor pre-charged with approximately 100 grams of a 1-wt.% solution of butanol. The system was run for 30-60 minutes at 1500 PSI, 1800 PSI, and 2000 PSI. Multiple runs at 1500 PSI were completed to validate results. Concentrations The effect the initial butanol concentration had on the mass transfer coefficient was studied. The initial concentration of butanol was varied while keeping the other reactor variables constant: pressure (1500 PSI), temperature (40oC), agitation speed and the flow rate of supercritical CO2. Three starting butanol concentrations were tested; 1, 2 and 3 wt.%. For each run the system was charged with 100 grams total of a water and butanol mixture, differing the proportion of butanol to water to change the weight percent. The reactor was run for 30 to 60 minutes for each trail and samples were taken in 10 to 15 minute intervals. The data was analyzed using gas chromatography. Multiple trials were performed for each weight percent to validate the data. Mass Flow Rates Our team analyzed their experimental data to determine the effect of changing the flow rate of supercritical carbon dioxide on the mass transfer coefficient and extraction 29PDF Image | Extraction of Bio-Butanol using Supercritical Carbon Dioxide
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