Solubility of CO2 in aqueous sodium β-alaninate: Experimental study and modeling using Kent Eisenberg model

Abstract

In this work, the equilibrium solubility of CO2 in aqueous solution of 10, 20, and 30wt% sodium β-alaninate (Na-βala) was investigated using high pressure solubility cell. The solubility experiments were carried out at temperatures 303.15, 313.15, and 333.15K and over CO2 partial pressure ranging from 2 to 25bar. Experimental results showed that with the increase in Na-βala concentration and temperature of the system, CO2 loading decreases. Whereas, the CO2 loading increases by increasing the partial pressure of CO2. Furthermore, a modified Kent–Eisenberg model was used to correlate CO2 solubility data as a function of temperature, concentration and CO2 partial pressure. An average absolute deviation of 12.8% was obtained between the experimental and model correlated data, which indicated the good correlation capability of the applied model.