Selective oxidations of organosulfur model compounds and coal for the removal of organic sulfur

摘要

Investigations with organosulfur compounds have established that potassium monopersulfate (Oxone) in aqueous ethanol and sodium perborate in glacial acetic acid are highly selective oxidants for the oxidation of organic sum ides and aromatic sulfur heterocycles to their corresponding sulfoxides and sulfones. In a series of selective oxidations, dibenzothiophene in ethanol, fluorene in ethanol, and a 50:50 mol mixture of dibenzothiophene (DBT) and fluoresce in ethanol were reacted with aqueous Oxone under mild conditions. Capillary gas chromatographic analyses showed conversions of DBT to DBT-5,5-dioxide, while its carbon analog, fluorene was recovered quantitatively in every case. Furthermore, selective oxidations with Oxone of a triboelectrostatically cleaned Illinois (number sign)6 ultrafine coal (400 mesh (times) 0) and an Illinois (number sign)6 coal (IBC-101) (200 mesh (times) 0) depyritized via microorganisms were investigated. X-ray photoelectron spectroscopic (XPS) data indicated oxidation of a large fraction of the organic sulfur on the coal surface. Approximately 55--85% of the total S 2p area could be attributed to oxidized organic sulfur in the form of sulfones. (ERA citation 17:027208)