Solvent Extraction of Toluene from Heptane with the Ionic Liquids N-Ethylpyridinium Bis(trifluoromethylsulfonyl)imide and z-Methyl-N-ethylpyridinium Bis(trifluoromethylsulfonyl)imide (z = 2, 3, or 4) at T = 313.2 K | Publicación