engleski

Choline chloride: propylene glycol (1:4) deep eutectic solvent for extractive gasoline purification

The advantage of deep eutectic solvents (DESs) is in the arbitrary selection of their components and their composition (in terms of component’s molar ratio), which directly affects the appropriate properties of solvents for certain application. The choice of choline chloride as HBA component[1, 2] and propylene glycol[3] as HBD component results in a DES that achieves good gasoline denitrification.[4] In this paper, choline chloride : propylene glycol (ChCl:PG) in a molar ratio of 1:4 was tested for denitrification and desulfurization of model and real FCC gasoline. A batch extraction process was performed at a temperature of 25 °C and atmospheric pressure, a stirring speed of 1000 rpm, an extraction time of 30 minutes and a DES:gasoline volume ratio of 1:1. The DES physical properties essential for extraction were determined. In a one-stage extraction experiment, the efficiency of denitrification and desulfurization reached ~86 % and ~21 %, respectively. By increasing the number of extraction stages, a decrease in DES extraction capacity was observed which was successfully resolved by DES recovering between stages. In a real gasoline sample, 36.8 % denitrification efficiency and only 10.5 % desulfurization efficiency was achieved. Hence, ChCl:PG 1:4 can be proposed as a suitable extraction agent for gasoline denitrification.

choline chloride - propylene glycol (1:4) ; deep eutectic solvent ; extractive desulfurization, denitrification ; gasoline purification

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