Patent GB-728585-A (GB)
Title: Improvements in or relating to the reduction of sulphur content of mineral oils
IPC: C07C9/00
Filed: 1951-07-04
Abstract: An aqueous solution comprising a water-soluble organic peroxy-compound is obtained by the aerial oxidation of hydrocarbons. The hydrocarbon material which is subjected to aerial oxidation may be a mineral oil fraction and is preferably paraffinic; for example, it may be a sulphur- and aromatic-free kerosine.  A suitable hydrocarbon material may be obtained by preparing a solid urea adduct from kerosine, removing the liquid phase, and then decomposing the adduct to produce a paraffin-enriched fraction.  Alternatively, a solid thiourea adduct may be prepared from kerosine and removed from the liquid phase, which liquid phase is the desired paraffin-enriched fraction.  In an example, sulphur- and aromatic-free kerosine is air-blown at 145 DEG  C. and the effluent air stream passed through a series of reflux condensers.  An aqueous phase is obtained from the condensed liquid and this aqueous phase contains the desired peroxy-compound.  Specifications 714,327 and 728,581, [Group III], are referred to.ALSO:Mineral oil containing sulphur compounds is desulphurized by reacting the oil with an aqueous solution comprising a water-soluble organic peroxy-compound obtained by the aerial oxidation of hydrocarbons, and separating the treated oil from the oxidation products of the sulphur compounds.  If desired, the reaction may be carried out with simultaneous air blowing of the reaction mixture.  Intimate contact of the oil phase with the aqueous phase during the reaction may be effected by the use of chemical dispersing agents, by mechanical dispersion or, when methanol is to be used in the extraction stage described below, by the addition of methanol.  The oxidation products of the sulphur compounds may be removed by such methods as acid washing, solvent extraction, for example, with methanol, fractional distillation, extractive distillation or adsorption, or by a combination of methods.  The mineral oil to be desulphurized may be a petroleum distillation fraction, particularly a kerosine or gas oil cut.  In the preparation of the aqueous solution comprising a water-soluble organic peroxy-compound, the hydrocarbon material which is subjected to aerial oxidation may be a mineral oil fraction and is preferably paraffinic; for example, it may be a sulphur- and aromatic-free kerosine.  A suitable hydrocarbon material may be obtained by preparing a solid urea adduct from kerosine, removing the liquid phase, and then decomposing the adduct to produce a paraffin-enriched fraction.  Alternatively, a solid thiourea adduct may be prepared from kerosine and removed from the liquid phase, which liquid phase is the desired paraffin-enriched fraction.  In an example, sulphur- and aromatic-free kerosine is air-blown at 145 DEG  C. and the effluent air stream passed through a series of reflux condensers.  An aqueous phase is obtained from the condensed liquid and this aqueous phase contains the desired peroxy-compound.  Crude gas oil is treated with this aqueous phase at 100 DEG  C. and the treated gas oil is extracted with methanol.  A raffinate of reduced sulphur content was thus obtained. Specifications 714,327 and 728,581 are referred to.