Absorption of oxygen in water using a multi-stage, crosscurrent packed column Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sj1395239

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  • A multi-stage, crosscurrent column, packed with Pall rings, was employed for oxygen absorption from an oxygen-rich air phase by contacting with water. Mass transfer data were collected for the column using 6 and 12 baffles and employing a partial gas phase recycle. Data were also collected from a countercurrent column having the same volume of packing as the crosscurrent column. The mass transfer efficiency for the column was determined using a variety of liquid to gas flowrate ratios and covering a range of liquid flowrates. Efficiencies were highest for flowrates above the transition point to crosscurrent flow. Efficiencies increased with decreasing liquid to gas ratios. Efficiences were higher with the larger number of baffles. Higher oxygen concentrations in the gas phase were created while using a gas phase recycle. The increased oxygen concentrations resulted in increased mass transfer efficiencies and increased oxygen utilization. The location of the transition point was correlated as a function of liquid flowrate and liquid to gas ratio. An earlier study, performed on the same column but using a different gas-liquid system and different ranges of flowrates, presented similar data. Comparison of the data from this study and the previous one shows that more information must be collected to determine which factors significantly influence the location of the transition point. The mass transfer efficiency for the countercurrent column was greater than for the crosscurrent column when similar flowrates were tested. However the flow-through capacity of the crosscurrent column was much greater than the flow-through capacity possible with the coutercurrent column. At flowrates above the flooding point for the countercurrent column the crosscurrent column achieved efficiencies which were comparable to the maximum efficiencies for the countercurrent column. Overall capacity coefficients were calculated and correlated as a function of liquid flowrate and liquid to gas ratio. Based on these results and the favorable pressure drop behavior demonstrated by other investigators the multi-stage crosscurrent column is an attractive alternative to the conventional towers used for the absorption of oxygen into water.
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