Study on CO2 Absorption with Aqueous Potassium Carbonate Solution Promoted by Boric Acid
The addition of promoter into aqueous potassium carbonate solution is one of the effective ways to enhance the CO2 absorption rate. In this work, the CO2 absorption rates were investigated for aqueous carbonate solution promoted by different addictives in a wetted wall column. The effect of concentration of boric acid on the overall gas-phase mass transfer coefficient and vapor-liquid equilibrium data was discussed. Results showed that the addition of boric acid can significantly enhance the CO2 absorption rate. The overall mass transfer coefficient increased by 80% with the addition of 3 wt% boric acid. CO2 partial pressure increased with the increasing temperature of aqueous potassium carbonate. However it decreased when boric acid was added, which would be favorable for CO2 absorption.
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