Effect of Column Variables on the Effective Mass Transfer Area and Efficiency in Packed Column
Abstract
Carbon dioxide, a component gas in biogas, not only lowers its calorific value but is a greenhouse gas contributing to global warming. To increase the calorific value, the raw gas is upgraded by sequestrating 〖CO〗_2 in a packed absorption column using a reactive solvent. This study investigates the effect of the effective mass transfer area a_e, on the column efficiency considering a select set of column variables. These variables are the gas and solvent superficial velocities, solvent concentration and 〖CO〗_2 concentration in the raw gas. The column was randomly packed using glass spheres of equal diameter. Experimental results showed that the column efficiency is a function of the effective area a_e, which is greatly influenced by the solvent superficial velocity and the solvent concentration while carbon dioxide concentration in the gas feed has least effect. From these findings, high column efficiency is attained at high ratios of solvent to gas superficial velocities due to the increased value of the effective area, created by the increase in turbulence in the liquid phase
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References
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