Absorption capacity and viscosity for CO2 capture process using [N1111][Gly] promoted K2CO3 aqueous solution

• Absorption capacity of CO2 in [N1111][Gly]-K2CO3 aqueous solution were measured.
• Effects of temperature and solution/gas compositions on absorption were illustrated.
• Viscosities of [N1111][Gly]-K2CO3 aqueous solution were measured and modeled.
• Effects of temperature and solution composition on viscosity were demonstrated.

Absorption performance of carbon dioxide (CO2)nitrogen (N2) mixture in tetramethylammonium glycinate ([N1111][Gly]) promoted potassium carbonate (K2CO3) aqueous solution was investigated. The mass fractions of [N1111][Gly] and K2CO3 respectively ranged from 0 to 0.075 and 0.15 to 0.25. The temperature ranged from 303.2 K to 323.2 K. The mole fraction of CO2 in CO2N2 mixture ranged from 0.3 to 1.0. Results showed that the absorption of CO2 can be accelerated remarkably when K2CO3 aqueous solution was promoted by small amount of [N1111][Gly]. The effects of temperature, solution composition and partial pressure of CO2 on the absorption capacity were illustrated. The viscosities of K2CO3-[N1111][Gly] aqueous solutions were measured and correlated, and the effects of temperature and mass fractions of K2CO3 and [N1111][Gly] on viscosities were demonstrated on the basis of experiments and calculations.