Abstract: 1,3,5-triisopropylbenzene was synthesized by alkylation of benzene and propylene using ionic liquids as catalyst. The compositions of ionic liquids and the alkylation conditions were studied. Moderate post-alkylation was used to improve the ratio of 1,3,5-triisopropylbenzene to 1,2,4-triisopropylbenzene in products and pure 1,3,5-triisopropylbenzene was obtained by fractionation. Results showed that 2AlCl3/Et3NHCl ionic liquid catalyst was preferred and the optimum reaction conditions were an ionic liquid volume ratio of 0.1, a reaction temperature of 50 ℃ and a propylene flow rate of 3.50 ml/s.

Key words: 1,3,5-triisopropylbenzene, ionic liquid, optimization, alkylation