Four ether-functionalized ionic liquids including 1-methoxyethyl-3-methyl imidazole chloride ([MOEMIM]Cl), 1-methoxyethyl-3-methyl imidazole bromide ([MOEMIM]Br), N,N,N-trimethyl-N-(2- methoxyethyl) ammonium bromide ([N111,1O2]Br), N,N,N-triethyl-N-(2-methoxyethyl) ammonium bromide ([N222,1O2]Br), were synthesized and applied as co-catalyst of triethylamine hydrochloride chloroaluminate ionic liquids for isobutane alkylation. The effect of four kinds of ionic liquids and the addition amounts on the catalytic performance of chloroaluminate ionic liquids had been systematically investigated. The results showed that addition of 6%(?) [MOEMIM]Cl into triethylamine hydrochloride chloroaluminate ionic liquids improved the C8 selectivity from 47.7% to 63.6% and research octane number (RON) from 83.5 to 93.2 at 25℃, 500 mL/h feed rate, 20:60 the volume ratio of acid to hydrocarbon. The optimized ether-functionalized composited ionic liquids catalyst could be reused for at least 20 times without loss activity. These enhancement is believed to result from the increased isobutane solubility, the inhibited acidity and improved interfacial properties.
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