The Research On Immobilized Ionic Liquid Synthesis Of2-(4-Ethyl Benzene Formyl) Benzoic Acid

2-(4-ethyl benzene formyl) benzoic acid is the important intermediate inindustrial production of2-ethyl anthraquinone. In this study, we use supportedionic liquids and poly ionic liquid catalyze ethyl benzene and benzene anhydrideto synthetize2-(4-ethyl benzene formyl) benzoic acid (F-C acyl reaction) forthe first time, and meanwhile1-butyl3-methyl imidazole chloride aluminate ischose as the Ionic liquid. The experiments also investigate the catalyticperformances of two kinds of ionic liquids for ethyl benzene and phthalicanhydride reaction to attain2-(4-ethyl benzene formyl) benzoic acid catalyticperformance.Loading carrier of ionic liquid ischosen inorganic porous materials-betazeolite, prepared by immersion preparation. The results show that the load rate ofcan be up to66.5%, using methylene chloride asdispersing agent, at70oC and12h oscillation time. The FTIR, BET, SEM and XRD are used to characterize thecatalyst. Zeolite loaded ethylbenzene F-C anhydrideare chosen to catalyzeacylation reaction, the presence of2-(4-ethyl) benzoic acid was confirmed byFT-IR. After phthalic anhydride with ethyl benzene in F-C acyl reaction, theproduct is analyzed by FT-IR, indicating the generation of2-(4-ethyl benzeneformyl) benzoic acid. Using UV spectrophotometer to analyze the yield of thereaction, the results show that the zeolite catalyst performance is enhanced withthe increasing of zeolite load factor. Particularly, the yield of the product can beup to38.9%when the loading of the catalyst is1.5times higher than that of rawmaterial, and the mole ratio of the ethyl benzene and benzene anhydride is1:1at80oC and8h reaction time.Poly ionic liquid is obtained as follows: First, using N-methyl imidazolereacts with allyl chloride to prepare ionic liquid monomer with adequate purity;And then, the monomer reacts with anhydrous AlCl3by mixed reaction; Finally,the poly (1-allyl-3-methyl imidazole chloride aluminate is prepared via crosslinking. Based on FT-IR to analysis the poly ionic liquid, it is found that thepurity of ionic liquids tested by the concentration of chloride ion detection issufficient for national standard, and thus the ionic liquid monomer can be used forthe next step of the reaction to preparate poly (1-allyl-3-methyl imidazolechloride aluminate) via cross-linking. Using FT-IR、BET and XRD to characterizethe poly ionic liquid catalyst and the analysis by UV, it is concluded that theswelling ratio of poly ionic liquid is biggest and the catalytic performance is thebest when the monomer concentration is0.37g/ml at70oC. By the orthogonalexperiment, it is found that the yield of the product can be up to60.1%when themole of the raw materials ratio of1:1.1, the molar ratio of catalyst to feedstock of1:1.2, at more than8h reaction time and80oC.