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    Thiols' extraction from 'jet-fuel' assisted by ionic liquids in hollow fibre membrane contactors

    Year: 2015

    Journal: JOURNAL OF MEMBRANE SCIENCE, Vol. 477, p 65-73, 20170208

    Authors: Ferreira, Ana R.; Neves, Luisa A.; Ribeiro, Jorge C.; Lopes, Fernando M.; Coutinho, Joao A. P.; Coelhoso, Isabel M.; Crespo, Joao G.

    Organizations: Univ Nova Lisboa, FCT, Dept Quim, CQFB REQUIMTE, P-2829516 Caparica, Portugal; Univ Aveiro, CICECO, Dept Quim, P-3810193 Aveiro, Portugal; Galp Energia, Refinaria Matosinhos, P-4452852 Leca Da Palmeira, Matosinhas, Portugal

    This work proposes an alternative technique for the selective extraction of thiols from a 'jet-fuel' model stream, using the 1-ethyl-3-methylimidazolium triflate ([C(2)mim][CF3SO3]) ionic liquid as extractant, in a hollow fibre membrane contactor. Due to the low distribution ratio of the thiol towards the ionic liquid, observed in single extraction, a regeneration step (stripping with vacuum or a sweep gas) was added to the extraction process, in order to maximize the concentration gradient overcoming thermodynamic constraints. The stripping with a sweep gas allowed for a complete regeneration of the ionic liquid producing a jet-fuel with sulphur content lower than 2 ppm. Since the controlling step of the process is the extraction of thiol from the feed phase to the ionic liquid phase, the increase of the ionic liquid velocity and operating temperature may further enhance the process performance. The results obtained along with the ultra-low sulphur jet-fuel model produced prove the high potential of this integrated process as an alternative method for replacing the current expensive desulphurization process. (C) 2014 Elsevier B.V. All rights reserved.