Deep eutectic solvents (DESs) have drawn a growing research interest for applications in a wide range of scientific and industrial arenas. However

a limited effort has been reported in the area of gas separation processes and particularly the carbon dioxide capture. This study introduces a novel set of DESs that were prepared by complexing ethylenediamine (EDA)

monoethanolamine (MEA)

tetraethylenepentamine (TEPA)

triethylenetetramine (TETA) and diethylenetriamine (DETA) as hydrogen bond donors to monoethanolamide hydrochloride (EAHC) salt as a hydrogen bond acceptor. The absorption capacity of CO

2

was evaluated by exploiting a method based on measuring the pressure drop during the absorption process. The solubility of different DESs was studied at a temperature of 313.15 K and initial pressure of 0.8 MPa. The DES systems 1EAHC:9DETA

1EAHC:9TETA and 1EAHC:9TEPA achieved the highest CO

2

solubility of 0.6611

0.6572 and 0.7017 mol CO

2

·(mole DES)

-1

respectively. The results showed that CO

2

solubility in the DESs increased with increasing the molar ratio of hydrogen bond donor. In addition

the CO

2

solubility increased as the number of amine groups in the solvent increases

therefore

increasing the alkyl chain length in the DESs

resulted in increasing the CO

2

solubility. FTIR analysis confirms the DES synthesis since no new functional group was identified. The FTIR spectra also revealed the carbamate formation in DES-CO

2

mixtures. In addition

the densities and viscosities of the synthesized DESs were also measured. The CO

2

initial investigation of reported DESs shows that these can be potential alternative for conventional solvents in CO

2

capture processes.