| The catalysis of ionic liquids in alkylation process is studied. Ionic liquids are synthesized by differentcation, such as pyridine,4-methyl-pyridine ,imidazole and aluminum trichloride as anion .Alkylation includes isobutane with small molecule olefins and benzene with long alkene. The alkylation of isobutane catalyzed by ionic liquids is investigated in an autoclave. Raw material and products are analyzed by gas chromatogram.. Ionic liquids' composition, weight, active stability, regeneration of and mixture of different catalysts are studied.In addition the effect of solvent used in synthesizing ionic liquids on activity and selectivity of ionic liquids and effect of olefins on compose of products,yield are also tested. In the alkylation of benzene with alkene, some technical conditions are tested . Through analysis the experiment datum ,the following results can be found : in the range of 2-30 ,temperature has little effect on the alkylation process of isobutene, selectivity of Cs is highest in 10 ,mole fraction of aluminum trichloride in 0.60~ 0.75,selectivity and activity are higher, cation and solvent affect the activity and seletivility of ionic Iiquids,the volume which occupied by different cation and different cation constructure is the main reason impacting catalysts' activity and selectivity.The active stability is better, Ionic liquids losing activity are regenerated by aluminum trichloride is better than hydrogen chloride handled and magnify in alkylation of isobitane.In the alkylation process of benzene ,the ratio of benzene to olefin, the composition of catalysts, temperature and length of time have little effect on the conversion of olefin, but have effect on the selectivity of 2-alkyl-benzene.
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