US 12,330,958 B2
Method of using nanofiltration and reverse osmosis to remove chemical contaminants
Justin Thomas Lydon Hedin, Cincinnati, OH (US); Fabrizio Meli, Montgomery, OH (US); and Karunakaran Narasimhan, Mason, OH (US)
Assigned to The Procter & Gamble Company, Cincinnati, OH (US)
Filed by The Procter & Gamble Company, Cincinnati, OH (US)
Filed on Feb. 1, 2024, as Appl. No. 18/429,699.
Application 18/429,699 is a continuation of application No. 18/071,764, filed on Nov. 30, 2022, granted, now 11,926,534.
Application 18/071,764 is a continuation of application No. 17/184,636, filed on Feb. 25, 2021, granted, now 11,548,794, issued on Jan. 10, 2023.
Claims priority of provisional application 62/983,116, filed on Feb. 28, 2020.
Prior Publication US 2024/0166534 A1, May 23, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B01D 61/02 (2006.01); C02F 1/00 (2023.01); C02F 1/28 (2023.01); C02F 1/32 (2023.01); C02F 1/72 (2023.01); C02F 1/78 (2023.01); C02F 101/34 (2006.01); C02F 103/34 (2006.01)
CPC C02F 1/001 (2013.01) [B01D 61/029 (2022.08); C02F 1/281 (2013.01); C02F 1/32 (2013.01); C02F 1/725 (2013.01); C02F 1/78 (2013.01); B01D 2311/2512 (2022.08); B01D 2311/2634 (2013.01); B01D 2321/12 (2013.01); B01D 2325/341 (2022.08); C02F 2101/34 (2013.01); C02F 2103/34 (2013.01); C02F 2301/026 (2013.01); C02F 2301/06 (2013.01); C02F 2305/023 (2013.01); C02F 2305/026 (2013.01)] 9 Claims
OG exemplary drawing
 
1. 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 comprising 1,4-dioxane; dimethyl dioxane; diethylene oxide sulfate;
or a combination thereof; and, optionally, a solvent;
b) providing a nanofilter; and
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;
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,
wherein at least a portion of the filtrate is further processed to destroy at least a portion of the chemical contaminant in the filtrate.