Abstract
To acquire high value-added alkaline polycyclic nitrogen compounds (PNC) from coal-based products, in this work, three N-alkyl-2-pyrrolidone based brønsted acidic ionic liquids (PBILs) N-hydro-2-pyrrolidone hydrosulfate ([NHPy]HSO4), N-ethyl-2-pyrrolidone hydrosulfate ([NEPy]HSO4) and N-methyl-2-pyrrolidone hydrosulfate ([NMPy]HSO4) were used as denitrogenation agents to remove quinoline from coal-based product model mixtures. The denitrogenation performance of the PBILs was evaluated using removal efficiency (RE). The RE values of the three PBILs [NHPy]HSO4, [NEPy]HSO4 and [NMPy]HSO4 for quinoline were 97.47%, 97.33% and 97.05%, respectively, with the optimal extraction denitrogenation conditions mass ratio of PBIL to coal-based products model mixture (MPBIL: Moil), 1:5; extraction denitrogenation temperature, 25 °C; extraction denitrogenation time, 30 min and initial quinoline content, 5 wt%. In addition, the interactions between the PBILs and quinoline in the coal-based product model mixtures were analyzed with quantum chemical calculations. The results showed that the intermolecular hydrogen bond (H-bond) formed between PBILs and quinoline was the main driving force for removing quinoline, but the intramolecular interactions formed between the cation and anion of PBILs partially inhibited quinoline removal.
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