Shu, C. and Sun, T., 2016. Separation Science and Technology, 51(8), pp.1336-1343.
As a new type of solvent, deep eutectic solvent (DES), an analogue of ionic liquids, has attracted great attention in recent years. Because of its many advantages, DES, as a substitute for traditional ionic liquids, is widely used in catalysis, organic synthesis, material preparation, material dissolution, separation process and so on. However, compared with traditional ionic liquids, DES is less used in fuel oil desulfurization at present. Therefore, it is of great significance to study the extraction desulfurization performance of DES.
Synthesis of DESs
TBAC was selected as hydrogen bonding acceptor (HBA) and ethylene glycol, glycerol and malonic acid as hydrogen bonding donors (HBD). DES was prepared by mixing HBA and HBD at a certain molar ratio (mostly 1:1, 1:2 or 1:3 in this study) at a certain temperature (90-120 °C).
The synthesis route of DES: add a certain molar ratio of HBA and HBD to the round bottom flask, stir violently at a certain temperature, heat the mixture into liquid for a few minutes, and continue to stir for a period of time (2-4 hours) until a uniform colorless liquid is formed. Finally, the obtained DES was dried in vacuum at 120 °C for 2 hours for extraction desulfurization.
Effect of Different DESs on Extraction Efficiency
The order of extraction efficiency of different DES is TBAC/ ethylene glycol > TBAC/ glycerol > TBAC/ malonic acid. Therefore, DES based on TBAC is an effective extractant for gasoline desulfurization.
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