Method of using nanofiltration and reverse osmosis to remove chemical contaminants
AssigneeThe Procter & Gamble Company
InventorsJustin Thomas Lydon HEDIN, Fabrizio MELI, Karunakaran NARASIMHAN
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Abstract
A method of removing chemical contaminants from a composition comprising an active, a solvent, and a contaminant can include providing an initial feed supply, wherein the initial feed supply comprises the active, the solvent, and the contaminant, wherein the contaminant can include 1,4 dioxane, dimethyl dioxane, or a combination thereof; including filtering the initial feed stock through a nanofilter and using reverse osmosis.
Claims18
A method of reducing the amount of a chemical contaminant in a composition, comprising;
- a) providing an initial feed supply comprising a composition comprising an active and a chemical contaminant and, optionally, a solvent;
- b) providing a nanofilter;
- c) filtering the initial feed supply through the nanofilter to form a retentate comprising at least a portion of the active and a filtrate comprising at least a portion of the chemical contaminant and at least a portion of the solvent;
- and
- d) subjecting the filtrate to reverse osmosis to form a reverse osmosis permeate and a reverse osmosis concentrate comprising at least a portion of the chemical contaminant.
A method of removing 1,4-dioxane from a surfactant composition comprising a surfactant and water, comprising:
- a) filtering the surfactant composition through a nanofilter which filters out chemicals with a weight average molecular weight below about 250 Da to form a retentate which comprises at least a portion of the surfactant and a filtrate which comprises at least a portion of the 4-dioxane and at least a portion of the water;
- and
- b) subjecting the filtrate to reverse osmosis to form a reverse osmosis permeate and a reverse osmosis concentrate comprising at least a portion of the chemical contaminant.
Dependencies are inferred from the claim text.