Oxygen absorption in water using a multiple stage crosscurrent packed tower with and without recycle Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ks65hg484

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  • The performance of a multiple stage crosscurrent tower packed with Pall rings was characterized with and without a recycle loop on the gas stream. The column used 12 baffles. The absorption system studied was the transfer of oxygen from an oxygen-enriched air stream into a water stream which is a relatively insoluble combination. A literature survey summarized the work done to date with crosscurrent columns. The column and associated equipment were described as well as the experimental procedure. The mass transfer data were summarized and sample calculations given. The non-recycle experiments were performed for liquid to gas flowrate ratios ranging from 15 to 25 at varying liquid flowrates. An efficiency term which compared oxygen concentration change in the liquid phase with the concentration driving force was used to evaluate the data. In terms of efficiency, two operating ranges existed in the column which agreed with earlier studies. Efficiencies were highest when the column was operated in the crosscurrent region and efficiencies increased with decreasing liquid to gas flowrate ratios. A correlation was developed between the liquid to gas flowrate ratio and the transition flowrate. The recycle experiments were performed for the recycle ratios of 0, 2.5, 3.0 and 3.5 with varying oxygen flowrates. A term which determined the relative percentage change in the oxygen concentration of the liquid was used to evaluate the data. It was determined that using a recycle loop with the gas stream increased the performance of the column and decreased the usage of oxygen.
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