Redox, Pressure and Mass Transfer Effects on Syngas Fermentation

摘要: REDOX, PRESSURE AND MASS TRANSFER EFFECTS ON SYNGAS FERMENTATION Allyson W. Frankman Department of Chemical Engineering Master Science The fermentation syngas (a mixture CO, CO2 and H2) to produce ethanol is interest as an alternative fuel. Clostridium carboxidivorans, has been found higher than average amounts butanol from CO-rich mixtures. This project sought determine the effects redox level in solution, partial pressures headspace mass transfer limitations on products obtained through syngas. It was determined that cysteine sulfide a greater effect media used grow bacteria, does gas composition. Therefore, changing composition during process will have little redox. However, addition may vary level. When cells were first inoculated, dropped leveled at -200 mV SHE for optimal growth. In addition, switch acetic acid production after drop 40-70 Different sizes reactors used, including 1 liter (non-pressurized), 50 mL bottles (20 psig) 100 psig). more double growth rate (0.57 day compared 0.20 day). Partial measured these two different consumptions pressure both acid/ethanol. clear re-gassing every 12 hours keep makes significant difference growth, making them very similar bottles. Both bottle essentially same (0.227 L/hr vs. 0.255 L/hr). because differences, there CO available (on per basis) Mass analysis proved useful pointing out all three likely experienced such are critical address when performing studies involving fermentation.