Process for stabilization of dry cleaning solutions
AssigneeGeneral Electric Company
InventorsRobert J. Perry, Donna A. Riccio
Life of this patent
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Abstract
A method for stabilizing silicone dry cleaning solvents that may contain an undesirable basic impurity capable of causing cyclic siloxane formation, comprising contacting the silicone solvent with an aqueous solution, and separating the silicone solvent.
Claims18
A method for stabilizing silicone dry cleaning solvents that contain an undesirable basic impurity capable of causing cyclic siloxane formation comprising, contacting a silicone dry cleaning solvent with an aqueous solution comprising a salt or a weak acid at a temperature of from about 10° C. to about 80° C., and separating the silicone solvent wherein said dry cleaning solvent is purified of said undesirable basic impurity.
A dry cleaning process comprising:
- (a) contacting an article with a silicone solvent;
- (b) removing the silicone solvent;
- (c) contacting the removed silicone solvent or a weak acid with an aqueous solution that contains an undesirable basic impurity capable of causing cyclic siloxane formation wherein the aqueous solution used is a salt or a weak acid solution;
- and
- (d) separating the silicone solvent from the aqueous solution wherein said solvent is purified of said undesirable basic impurity.
Dependencies are inferred from the claim text.