公开(公告)号：US11827544B2

公开(公告)日：2023-11-28

申请号：US18078251

申请日：2022-12-09

Applicant: Stepan Company

Inventor： Matthew V. Vollmer ,  Donald E. Oulman ,  Aaron Brown ,  Dennis Smith ,  Doug Gustafson ,  Terry Applebury

IPC: C02F1/72 ,  C02F1/02 ,  C02F1/28 ,  C02F1/42 ,  C02F1/78 ,  C02F101/32 ,  C02F101/34 ,  C02F103/36

CPC classification number: C02F1/722 ,  C02F1/025 ,  C02F1/285 ,  C02F1/42 ,  C02F1/78 ,  C02F2101/32 ,  C02F2101/34 ,  C02F2101/40 ,  C02F2103/36 ,  C02F2305/023

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.

公开(公告)号：US20230116436A1

公开(公告)日：2023-04-13

申请号：US18078251

申请日：2022-12-09

Applicant: Stepan Company

Inventor： Matthew V. Vollmer ,  Donald E. Oulman ,  Aaron Brown ,  Dennis Smith ,  Doug Gustafson ,  Terry Applebury

IPC: C02F1/72 ,  C02F1/78 ,  C02F1/42 ,  C02F1/28 ,  C02F1/02

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.