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A carbonium pseudo ionic liquid with excellent extractive desulfurization performance
Author(s) -
Gao Jiajun,
Meng Hong,
Lu Yingzhou,
Zhang Hongxing,
Li Chunxi
Publication year - 2013
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.13869
Subject(s) - carbonium ion , chemistry , benzothiophene , flue gas desulfurization , dibenzothiophene , ionic liquid , lewis acids and bases , alkylation , organic chemistry , toluene , selectivity , inorganic chemistry , thiophene , catalysis
Lewis hard acid AlCl 3 was softened by some butyl halides forming highly polarized liquids. These liquids are similar to the ionic liquids (ILs) with metallic complex anion and varying composition, and thus termed here as carbonium pseudo ILs (CPILs). The CPILs, that is, t ‐C 4 H 9 Cl‐AlCl 3 , n ‐C 4 H 9 Cl‐AlCl 3 , and t ‐C 4 H 9 Br‐AlCl 3 , show very strong desulfurization activity for various thiophenic compounds like 3‐methylthiophene, benzothiophene, and dibenzothiophene. The above thiophenic compounds can be removed completely from model oils within 20 min by a very small amount of CPILs reactive extractant. The extractive mechanism is deemed as an acid–base complexation along with alkylation of the thiophenic compounds, and the Lewis acidity comes from both carbonium ion (borderline acid) and the dissolved AlCl 3 (hard acid). The t ‐C 4 H 9 Cl‐AlCl 3 shows good selectivity for three thiophenic compounds even in toluene‐containing system. Further, some CPILs show satisfactory desulfurization performance for the model gasoline that mimics the composition of real one. © 2012 American Institute of Chemical Engineers AIChE J, 59: 948–958, 2013