Purification of sulfur
AssigneeFMC Corporation
InventorMorton Meadow
Life of this patent
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Abstract
Sulfur produced by the reaction of hydrogen sulfide and sulfur dioxide in the presence of organic solvent solutions of alkali or alkaline earth metal salts of carboxylic acids is contaminated with these carbonaceous materials. The sulfur is purified by washing with water at elevated temperatures to reduce the carbonaceous material content to 0.007% carbon, by weight.
Claims7
The method of removing carbonaceous materials from sulfur produced by the reaction of hydrogen sulfide and sulfur dioxide in the presence of an organic solvent solution of an alkali metal or alkaline earth metal salt of a carboxylic acid at a temperature between about 120.degree. and about 140.degree. C. whereby the sulfur is in liquid state which comprises separating the liquid sulfur from the organic solvent solution, thereafter contracting the sulfur in liquid state with water at a temperature of between about 120.degree. C. and about 140.degree. C. under pressure for a period sufficient so as to reduce the carbonaceous material content of the sulfur to not more than about 0.007% carbon by weight and recovering the sulfur.
Dependencies are inferred from the claim text.