Carbon dioxide loading capacity in aqueous solution of Potassium salt of Proline blended with Piperazine as new absorbents

• CO2 solubility in solutions of potassium prolinate + piperazine is measured.
• Solution of potassium prolinate + piperazine has very high loading capacity.
• Deshmukh-Mather model is extended to predict CO2 loading.

In this work aqueous solution of potassium prolinate (KPr) blended with piperazine (PZ) have been utilized through CO2 solubility measurements in order to investigate the possible use of these salts of amino acid blended with alkanolamine for CO2 absorption. The equilibrium solubility of CO2 for KPr blended with PZ solutions at 1.0, 4.0 and 10.0 wt.% overall mass concentration is experimentally measured with an equilibrium cell at CO2 partial pressure ranging from 4.8 to 2383.2 kPa and temperatures between 293.15 and 323.15 K. Obtained data showed that loading capacity decreases with an increase in temperature and concentration of KPr. Obtained CO2 loadings are very high at low concentration of KPr. In order to predict CO2 solubility in KPr blended with PZ, Deshmkh-Mather model is extended. The values of MSE, ARD and R2 for the extended Deshmukh-Mather model are 0.0363, 10.7770 and 0.9844, respectively.