Abstract
The absorption rate and solubility of carbon dioxide (CO2) into 35wt% aqueous potassium carbonate (K2CO3) solution in the presence of different promoters were evaluated experimentally. A vapor–liquid equilibrium (VLE) apparatus was used to measure the equilibrium partial pressure of CO2 and CO2 partial pressure changes with time in CO2 partial pressures ranging from 0 to 50kPa (low partial pressures) and at temperature 313.15K. The activators considered are Piperazine (PZ), 2-(1-piperazinyl)-ethylamine (PZEA), Monoethanolamine (MEA), Tetraethylenepentamine (TEPA) and Boric acid (BA). Different molar ratios of the activator to K2CO3 (0.25, 0.66 and 1.5) at constant total blend concentration of 2.5moldm−3 (M) were investigated to find the optimal molar ratio. Among studied promoters, the highest absorption rate and CO2 solubility was achieved with the TEPA+K2CO3 solution with molar ratios of 0.66 and 1.5 respectively. As an overall conclusion, TEPA+K2CO3 solution could be a potential candidate for CO2 capture.
Published Version
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