GB282738A - - Google Patents

Abstract

282,738. Axtell Research Laboratories, Inc., (Assignees of Axtell, F. C.). Dec. 27, 1926, [Convention date]. Mineral oils, purifying-The sulphur content of oils such as gasoline, kerosene, lubricating oils, or cracked distillates, is reduced by treatment with a reagent comprising sulphuric acid, preferably fuming, heated with excess of aromatic hydrocarbon preferably commercial benzene and its homologues at room temperature, whereby an acid sludge containing most of the sulphur is formed, and the aromatic and unsaturated content of the oil is unattacked. Concentrated sulphuric acid may be added to the reagent as required to react with the unsaturated portion. The oil is separated from the acid sludge, which may be largely freed from sulphur by adding water. The oil, preferably after treatment with a basic clay, which is then separated, is shaken with a strong aqueous alkali solutions. After separation, the oil is redistilled, and sulphur not separated in the acid sludge remains largely in the still. By treating an oil with an end boiling point of 225‹ C. with 12¢ lbs. of reagent per barrel, and blending with about 20 per cent of kerosene distillate and distilling wtih steam over caustic potash, the sulphur content is reduced from 0.68 per cent to 0.11 per cent. Commercial toluene and xylene may be added to or replace the benzene to raise the boiling point. The fuming sulphuric acid may contain enough sulphur trioxide to combine with any water formed on the formation of the benzene sulphonic acid. Crude distillates from cracking units may be first and immediately washed with caustic soda or sodium plumbite. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the use of selenic acid in place of sulphuric acid. This subjectmatter does not appear in the Specification as accepted