| Deep eutectic solvents?DESs?have the similar physical and chemical properties with the ionic liquids,but compared with the traditional ionic liquids,deep-eutectic solvents are greener,cheaper,easier-synthesis and no purification requirement.Deep eutectic solvents are a kind of new green solvents.In this thesis,the hydrogen sulfide absorption capacity of eleven different deep eutectic solvents was measured:tetrabutylammonium bromide based deep eutectic solvents and choline chloride based deep eutectic solvents.A variety of factors that influence on the absorption of hydrogen sulfide are investigated,including the ratio of HBA and HBD,temperature and pressure.The results showed that,the solubility of hydrogen sulfide in the DESs increased almost linearly with increasing pressure?0.1?0.6 MPa?and decreased with increasing temperature,it indicates that the absorption of hydrogen sulfide in DESs is physical absorption.The solubility of hydrogen sulfide in the tetrabutylammonium bromide based DESs in higher than choline chloride based DESs.The solubility of hydrogen sulfide in the quaternary ammonium salt/carboxylic acid DESs decreases with the increasing of the acidity of the carboxylic acid,and decreases with the increasing of the ratio of carboxylic acid.The solubility of hydrogen sulfide in the quaternary ammonium salt/polyol DESs decreases with the increasing of the ratio of polyols.The DESs in this thesis,the absorption capacity of the tetrabutyl ammonium bromide/caprolactam?TBAB/CPL?showed the best performance,which can reach 4.70 mol·kg-1?1:1?and 4.00 mol·kg-1?1:2?at 298 K and 0.5 MPa.Then the tetrabutylammonium bromide/propionic acid?TBAB/Pro?,tetrabutyl ammonium bromide/acetic acid?TBAB/Ac?and tetrabutylammonium bromide/formic acid?TBAB/For?,the hydrogen sulfide absorption capacity was 3.81 mol·kg-1?1:1?,3.65 mol·kg-1?1:1?and 3.40 mol·kg-1?1:1?.The solubility of H2S in DESs is better or equal to the ionic liquids,and has high selectivity to H2S. |
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