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Résumé :
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[BuPy]Br-AlCl3 and [BMIm]Br-AlCl3 were used to remove trace olefins from aromatics. At room temperature, almost 100% olefin conversion was obtained using [BuPy]Br-AlCl3 as the catalyst. The effects of the cation and the dosage of AlCl3 in the ionic liquid were investigated. It was found that the dosage of AlCl3 had a significant impact on the reaction, whereas the organic cation type mainly influenced the conversion. Anions in [BuPy]Br-AlCl3 such as AlCl4- and AlCl7- were shown to exist by ESI-MS, and the mechanism of the reaction catalyzed by [BuPy]Br-AlCl3 was studied. The investigation of various reaction parameters showed that the process saves time, consumes less energy, separates products more easily, and produces less pollution to the environment than conventional methods to remove trace olefins from aromatics.
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