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Deep eutectic solvents (DESs) became an object of a great interest as an alternative to ionic liquids (ILs) and commonly used in CO 2 capture amine solutions. In the present study, five different DESs based on 3-amino-1-propanol as physical-chemical CO 2 absorbents were used. The composition was chosen in order to estimate the effects of hydrogen bond acceptor:hydrogen bond donor (HBA:HBD) molar ratio, anion type and length of alkyl chain of composing salt. The Fourier Transform Infrared (FTIR) spectroscopy was used to confirm chemical reaction. The solubility of CO 2 was measured at low pressures up to 170 kPa at the temperature range of 293-318 K. Viscosity, polarity and Kamlet-Taft parameters were determined in order to estimate the dependences of the parameters and the CO 2 capacity. CO 2 uptake was observed to improve with decreasing molar ratio of hydrogen bond donor. Comparing the CO 2 capacity of [TBAC]-based DESs, at the approximate pressure of 50 kPa, it was observed that the capacity increased in the following order of molar ratios-1:8 &lt; 1:6 &lt; 1:4 and a decrease in molar ratio from 1:8 to 1:4 resulted in about a 100% increase of capacity. Compared to [TBAC][AP] DESs, the [TEAC][AP] 1:4 and [TBAB][AP] 1:4 exhibited higher CO 2 uptake, though the best results were obtained for [TBAB][AP].

Solubility of Carbon Dioxide in Deep Eutectic Solvents Based on 3-Amino-1-Propanol and Tetraalkylammonium Salts at Low Pressure