Patent ID: 6106795
Filing Date: 2000-08-22
Classification: C01B,Y10S,Y10T

Abstract:
A method for regenerating contaminated sulfuric acid comprising:(a) cooling the contaminated sulfuric acid to a lower temperature sufficient to form at least one liquid hydrate of sulfuric acid without forming a solid hydrate of sulfuric acid;(b) maintaining the contaminated sulfuric acid at the lower temperature for a time sufficient to form at least one liquid hydrate of sulfuric acid and precipitate an amount of the contaminant;(c) separating the precipitated contaminant from the cooled acid; and(d) warming the acid to decompose the liquid hydrate, wherein the mole fraction of sulfuric acid ranges from about 0.02 to about 0.40 and wherein the lower temperature sufficient to form at least one liquid hydrate of sulfuric acid is about 267.degree. K.