In the sodium bicarbonate bubble column, carbon dioxide gas CO2, as a gaseous mixture of CO2 and air, is continuously injected into sodium carbonate Na2CO3 and bicarbonate NaHCO3 brine. In this work, a molar balance has been produced for flows and components, on the basis of Danckwerts theory for mass transfer between gas and liquid phases, and a population balance has been derived to obtain the nucleation and growth formula. For validation the model results were compared with experimental data. The effects of several conditions on the sodium bicarbonate crystal nucleation and growth rate were investigated. Nucleation and growth rate change under different operating conditions, and, especially, a formula derived at one temperature cannot be used at a different temperature. Production of sodium bicarbonate crystals is reduced by increasing the temperature of the liquid, reducing the gas pressure, or reducing the mole fraction of CO2 in the gas phase.
Research on Chemical Intermediates – Springer Journals
Published: Jun 18, 2013
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