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Extraction of aromatic sulfur compounds from model oil using a temperature-responsive ionic liquid (IL) N-butyl-N-methylpiperidinium tetrachloroferrate ([C4mpip]FeCl4) as extractant has been investigated. In the extractive desulfurization process, liquid–liquid equilibrium was obtained at 45°C for 10min. After the extraction system was cooled to room temperature, the IL returned to solid due to the...
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