9. Oxygen Transfer in Hydrocarbon Fermentation Consider the hydrocarbon fermentation with yeast growing aerobically on hexadecane. (a) Estimate the liquid phase oxygen transfer coefficient from gas bubbles to the aqueous liquid phase in an airlift fermentor in which the aqueous liquid phase density is 1 g/ml, the aqueous liquid phase viscosity is 0.009 g/cm-sec, the diffusivity of oxygen is 2.5 x 10°³ cm²/sec, the mean diameter of the bubbles is 1.3 mm, the gas flow rate is 1 volume of gas per volume of liquid per minute, and the pressure is 17 psia entering and 14.7 psia in the effluent. (b) Estimate the oxygen transfer coefficient for oxygen transfer from dissolved oxygen in the aqueous liquid phase to yeast cells suspended in the aqueous liquid phase. Assume the yeast cells are spherical with a diameter of 0.006 mm. (c) What is the rate controlling resistance in the overall transport of oxygen from the gas bubbles to the cells? (Based on a problem provided by Professor L.E. Erickson, Kansas State University.)
9. Oxygen Transfer in Hydrocarbon Fermentation Consider the hydrocarbon fermentation with yeast growing aerobically on hexadecane. (a) Estimate the liquid phase oxygen transfer coefficient from gas bubbles to the aqueous liquid phase in an airlift fermentor in which the aqueous liquid phase density is 1 g/ml, the aqueous liquid phase viscosity is 0.009 g/cm-sec, the diffusivity of oxygen is 2.5 x 10°³ cm²/sec, the mean diameter of the bubbles is 1.3 mm, the gas flow rate is 1 volume of gas per volume of liquid per minute, and the pressure is 17 psia entering and 14.7 psia in the effluent. (b) Estimate the oxygen transfer coefficient for oxygen transfer from dissolved oxygen in the aqueous liquid phase to yeast cells suspended in the aqueous liquid phase. Assume the yeast cells are spherical with a diameter of 0.006 mm. (c) What is the rate controlling resistance in the overall transport of oxygen from the gas bubbles to the cells? (Based on a problem provided by Professor L.E. Erickson, Kansas State University.)
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Transcribed Image Text:9. Oxygen Transfer in Hydrocarbon Fermentation
Consider the hydrocarbon fermentation with yeast growing aerobically on hexadecane.
(a) Estimate the liquid phase oxygen transfer coefficient from gas bubbles to the aqueous
liquid phase in an airlift fermentor in which the aqueous liquid phase density is 1 g/ml, the
aqueous liquid phase viscosity is 0.009 g/cm-sec, the diffusivity of oxygen is 2.5 x 10°³
cm²/sec, the mean diameter of the bubbles is 1.3 mm, the gas flow rate is 1 volume of gas
per volume of liquid per minute, and the pressure is 17 psia entering and 14.7 psia in the
effluent.
(b) Estimate the oxygen transfer coefficient for oxygen transfer from dissolved oxygen in
the aqueous liquid phase to yeast cells suspended in the aqueous liquid phase. Assume the
yeast cells are spherical with a diameter of 0.006 mm.
(c) What is the rate controlling resistance in the overall transport of oxygen from the gas
bubbles to the cells? (Based on a problem provided by Professor L.E. Erickson, Kansas
State University.)
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