Carbon
dioxide (CO2) is a detrimental greenhouse gas
to the environment as the main contributor to global warming.
However, the development of efficient methods for CO2 absorption
and separation is still a great challenge. Ionic liquids (ILs) have
emerged as promising solvents for CO2 separation due to
negligible vapor pressure and adjustable structures. In this work,
a new strategy that three superbase ILs are designed as hydrogen bond
acceptor (HBA) and further combined with ethylene glycol (EG) as hydrogen
bond donor (HBD) to form novel IL-based deep eutectic solvents (DESs)
was proposed for efficient and reversible absorption of CO2. The results indicated that both excellent recyclability and high
CO2 mass capacity up to 0.141 g CO2/g DES under
40 °C and 100 kPa are achieved by [HDBU][Im]/EG with the mass
ratio of 7:3, and the value is much higher than those of most of the
reported IL-based DESs. The superior CO2 absorption and
desorption performances were attributed to the synergistic interaction
between both IL and EG with CO2 to form carbamate and carbonate,
respectively. This work provides a feasible method for designing IL-based
solvents in CO2 separation applications.
Solubilities of sebacic acid in binary ethanol + water solvent mixtures were measured by the dynamic method using a laser monitoring observation technique at a temperature range from (288 to 352) K. The mole fraction of ethanol in the solvent mixtures ranges from 0 to 1. The melting temperature and enthalpy of fusion of sebacic acid were determined by differential scanning calorimetry. The experimental results show that the slope of the solubility-temperature curve increases significantly with an increase in the mole fraction of ethanol in the solvent. The Wilson equation is applied to describe measured systems. The model parameters of the Wilson equation were expressed as a function of temperature.
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