Graduate Thesis Or Dissertation

 

Mass transfer in a multiple stage cross-current packed column Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mk61rk59j

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  • A cascade crosscurrent column, packed with Pall rings, was employed for ammonia absorption from ammonia-rich air phase by contacting with water. Absorption efficiency was presented as the percentage of NH₃ removed as well as the volume of a transfer unit. A review of the literature concerning the theoretical and experimental investigation of mass transfer in the crossflow columns was presented. Information extracted from the tracer studies along with the mass transfer results confirmed the existence of two distinct regions; the transition between the two regions could be visually observed in the column. A decrease in the absorption efficiency was observed due to the expansion of the packing section. Upon reduction in the number of baffles, the absorption efficiency decreased further. It was also concluded that the mixing activities in the packing and on the baffles after the transition compensated for the loss of efficiency due to the dead space, created by the criss-crossing of the liquid. Based on the experimental results and visual observations in the crosscurrent column, the bypass model for the region prior to the transition and the zero bypass model for the region after the transition were proposed. The models were successful in predicting the experimental data. Correlations were developed that adequately predicted the percentage bypass in the column, with original packing, expanded packing and expanded packing with six baffles, for the operating conditions investigated in this work. Favorable pressure drop results, obtained by other investigators, combined with the results of this work suggested the cascade crosscurrent packed column to be an attractive alternative to the conventional towers for the ammonia-air-water system.
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