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Table 2 Nominal parameter values for the synthesis gas bubble column reactor

From: Metabolic modeling of synthesis gas fermentation in bubble column reactors

Parameter Symbol Value Source
Reactor length L 25 m Specified
Reactor cross-sectional area A 5 m2 Specified
Superficial gas velocity u G 75 m/h Specified
Liquid phase velocity u L 0.25 m/h Specified
Liquid phase dispersion coefficient D A 0.25 m2/h Specified
Temperature T 37 °C [3]
Pressure at top of column P L 1.013×105 Pa Specified
CO mole fraction in feed gas x C 0.6 Specified
H2 mole fraction in feed gas x H 0.4 Specified
CO2 mole fraction in feed gas x D 0 Specified
CO Henry’s law constant H C 8×10−4 mol/L/atm [35]
H2 Henry’s law constant H H 6.6×10−4 mol/L/atm [35]
CO2 Henry’s law constant H D 2.5×10−2 mol/L/atm [35]
CO gas–liquid mass transfer coefficient k m , C 80 h−1 [9]
H2 gas–liquid mass transfer coefficient k m , H 200 h−1 [34]
CO2 gas–liquid mass transfer coefficient k m , D 80 h−1 Specified
Maximum gas volume fraction ε G , max 0.53 Fit to data
Gas volume fraction saturation constant K G 540 m/h Fit to data
Gas volume fraction ε G 0.0646 Calculated
CO concentration at reactor entrance C GF 80.64 mmol/L Calculated
H2 concentration at reactor entrance H GF 53.76 mmol/L Calculated
CO2 concentration at reactor entrance D GF 0 mmol/L Calculated
Initial biomass concentration X 0 0.1 g/L Specified
Initial gas phase CO concentration C G0 80.64 mmol/L Calculated
Initial gas phase H2 concentration H G0 53.76 mmol/L Calculated
Initial gas phase CO2 concentration D G0 0 mmol/L Calculated
Initial liquid phase CO concentration C L0 1.642 mmol/L Calculated
Initial liquid phase H2 concentration H L0 0.903 mmol/L Calculated
Initial liquid phase CO2 concentration D L0 0 mmol/L Calculated
Initial liquid phase ethanol concentration E L0 0 mmol/L Specified
Initial liquid phase acetate concentration A L0 0 mmol/L Specified