title: Ionic liquids screening for desulfurization of natural gasoline by liquid-liquid extraction.
abstract: Seventy five ionic liquids (ILs) were tested as a sequestering agent of sulfured compounds in natural gasoline (NG). Desulphurization of NG was performed by means of liquid-liquid extraction method at room temperature and atmospheric pressure. Experimental ILs containing imidazolium, pyridinium, and ammonium cations along with organic and inorganic anions were synthesized conventionally and under microwave and sonochemical conditions. The effect of the molecular structure of ILs on the desulfurization efficiency of NG with high sulfur content was evaluated. Analysis indicated that the anion type played a more important role than the cation on the desulphurization process. ILs based on halogen-ferrates and halogen-aluminates exhibited the highest efficiency in sulfur removal, and their efficiency is further improved when there is an excess of metallic salt in a ratio of at least 1:1.3 during the synthesis of the corresponding IL. An explanation for the ability of metallic ILs to remove sulfur-containing compounds from natural gasoline based on the ratio of the ionic charge to the atomic radius is proposed. Furthermore, a method to recover and reuse water-sensitive to halogenated precursors is described.
authors.affiliation: Programa de Ingeniería Molecular, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte 152, Mexico, DF, 07730, Mexico.
authors.forename: Natalya V
authors.initials: NV
authors.lastname: Likhanova
authors.forename: Diego
authors.initials: D
authors.lastname: Guzmán-Lucero
authors.forename: Eugenio A
authors.initials: EA
authors.lastname: Flores
authors.forename: Paloma
authors.initials: P
authors.lastname: García
authors.forename: Marco A
authors.initials: MA
authors.lastname: Domínguez-Aguilar
authors.forename: Jorge
authors.initials: J
authors.lastname: Palomeque
authors.forename: Rafael
authors.initials: R
authors.lastname: Martínez-Palou
mesh_terms: D005591:Chemical Fractionation / Q000379:methods*; D002853:Chromatography, Liquid / Q000379:methods; D004353:Drug Evaluation, Preclinical / Q000379:methods; D004526:Efficiency; D005742:Gasoline / Q000032:analysis; D006860:Hydrogen Bonding; D052578:Ionic Liquids / Q000737:chemistry* / Q000494:pharmacology*; D008954:Models, Biological; D013455:Sulfur / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D013457:Sulfur Compounds / Q000032:analysis / Q000737:chemistry* / Q000493:pharmacokinetics
chemical_list: D005742:Gasoline; D052578:Ionic Liquids; D013457:Sulfur Compounds; D013455:Sulfur