The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 2023
Filed:
Dec. 09, 2022
Stepan Company, Northbrook, IL (US);
Matthew V. Vollmer, Ballwin, MO (US);
Donald E. Oulman, Durham, NC (US);
Aaron Brown, Northbrook, IL (US);
Dennis Smith, Pittsburg, CA (US);
Doug Gustafson, Pittsburg, CA (US);
Terry Applebury, Pittsburg, CA (US);
Stepan Company, Northbrook, IL (US);
Abstract
A method of degrading 1,4-dioxane in the wastewater produced during the manufacture of alkyl ether sulfates is disclosed. The method includes the steps of (a) mixing from 100 to 10,000 ppm, preferably 1,000 to 4,000 ppm of ozone with the wastewater; (b) introducing HOinto the wastewater in an amount of 0.01 to 10, preferably 0.1 to 0.5 molar equivalents of HOto ozone, and (c) mixing the ozone, HO, and wastewater to generate hydroxyl radicals reactive with the 1,4-dioxane, without the addition of a metal catalyst. The hydroxyl radicals react with the 1,4-dioxane and degrade it into carbon dioxide, water and/or carbonate. The method is effective to reduce a concentration of 1,4-dioxane in the wastewater from a range of about 10 ppm to about 1000 ppm of dioxane down to less than 5 ppb of 1,4-dioxane after treatment. The method is also effective for removing hydrocarbon species that may be present in the wastewater.