Benzothiophene (BT), dibenzothiophene (DBT) and 4,6-dimethlydibenzothiophene (4,6-DMDBT) were extracted from an oil phase to ionic liquid phase, and then oxidized to the corresponding sulfone by the cheap catalyst, N-hydroxyphthalimide (NHPI), using molecular oxygen as the oxidant in one-pot. The system can be recycled 5 times without a significant decrease in desulfurization.
J. Wang, Q. Guo, C. Zhang and K. Li, RSC Adv., 2014, 4, 59885 DOI: 10.1039/C4RA09659B
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