              Marcos Larriba, Pablo Navarro, Noemí DelgadoMellado, Carlos González, Julián García, * and Francisco Rodríguez. Dept. of Chemical Engineering, Complutense University of Madrid, E–28040 Madrid, Spain. ! The pyrolysis gasoline is the main source of benzene, toluene, and xylenes. The dearomatization of this stream is currently performed by liquidliquid extraction using sulfolane. However, the Sulfolane process has high operating costs that could be minimized by employing ionic liquids (ILs) as solvents because of their nonvolatile character. In this work, we proposed a novel process to perform the dearomatization of pyrolysis gasoline using a binary mixture of 1ethyl3methylimidazolium tricyanomethanide ([emim][TCM]) and 1 ethyl4methylpyridinium bis(trifluoromethylsulfonyl)imide ([4empy][Tf 2 N]) ILs. The composition in the IL mixture was optimized considering their extractive and thermophysical properties. The Kremser method was applied using the experimental data to determine the number of equilibrium stages in the liquidliquid extractor which provides the same extraction yields of aromatics using the IL mixture that those of the Sulfolane process. The recovery section was designed and simulated from the experimental vaporliquid equilibrium between the hydrocarbons and the IL mixture. " #$ Separations: Materials, Devices and Processes. % & aromatic/aliphatic separation, ionic liquids, liquid–liquid extraction, vapor liquid separation, simulation * Corresponding author. Tel.: +34 91 394 51 19; Fax: +34 91 394 42 43. E–mail address: jgarcia@quim.ucm.es (Julián García). Separations: Materials, Devices and Processes AIChE Journal DOI 10.1002/aic.15735 This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/aic.15735 © 2017 American Institute of Chemical Engineers (AIChE) Received: Feb 02, 2017; Revised: Feb 28, 2017; Accepted: Mar 24, 2017 This article is protected by copyright. All rights reserved.