Physical Solubility of CO2 in Novel Solvent Called Stonvent Using “N2O Analogy” Method

Physical solubility of carbon dioxide (CO2) gas in a novel solvent; Stonvent, has
been estimated by applying “Nitrous Oxide (N2O) Analogy” method and compared
to conventional amines in terms of its solubility performance obtained from Henry’s
law calculations. The analogy is applied due to the reaction between CO2 gas and
Stonvent, will be proven to be valid with spectroscopy test. The experiment was
conducted at various temperatures (303.15, 313.15 and 323.15) K with pressure
ranges at (10, 45 and 80) bar. A solubility apparatus which consists of two pressure
vessels has been used to measure the solubility of N2O in Stonvent. The
experimental Henry’s constant of N2O have been correlated with that of CO2 in
Stonvent. The data obtained demonstrate that the Henry’s constant of CO2 in
Stonvent decreases with decreasing temperature and increasing pressure. Lower
Henry’s constant indicates higher solubility of CO2 gas in Stonvent. Hence, optimum
physical solubility of CO2 in Stonvent obtained is at 303.15 K and 80 bar. Stonvent
also showed a better solubility performance compared to the conventional amines
such as monoethanolamine (MEA) due to the lower Henry’s constants obtained.
Finally, the spectra of Stonvent contacted with N2O and CO2 are compared; in which
the negligible effect of N2O vibration showed that the analogy is valid for this experiment