Title:
CATALYST-FREE METHOD FOR DEGRADING DIOXANE IN ALKYL ETHER SULFATE VACUUM REMOVAL WATER
Document Type and Number:
WIPO Patent Application WO/2022/265998
Kind Code:
A9
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 H2O2 into the wastewater in an amount of 0.01 to 10, preferably 0.1 to 0.5 molar equivalents of H2O2 to ozone, and (c) mixing the ozone, H2O2, 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.
Inventors:
VOLLMER MATTHEW V (US)
OULMAN DONALD E (US)
BROWN AARON (US)
SMITH DENNIS (US)
GUSTAFSON DOUG (US)
APPLEBURY TERRY (US)
OULMAN DONALD E (US)
BROWN AARON (US)
SMITH DENNIS (US)
GUSTAFSON DOUG (US)
APPLEBURY TERRY (US)
Application Number:
PCT/US2022/033265
Publication Date:
March 02, 2023
Filing Date:
June 13, 2022
Export Citation:
Assignee:
STEPAN CO (US)
VOLLMER MATTHEW V (US)
OULMAN DONALD E (US)
BROWN AARON (US)
SMITH DENNIS (US)
GUSTAFSON DOUG (US)
APPLEBURY TERRY (US)
VOLLMER MATTHEW V (US)
OULMAN DONALD E (US)
BROWN AARON (US)
SMITH DENNIS (US)
GUSTAFSON DOUG (US)
APPLEBURY TERRY (US)
International Classes:
C02F1/00; B01D61/00; C02F1/72
Attorney, Agent or Firm:
GALLAGHER, Priscilla F. (US)
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