Process for reducing the levels of nitrite contaminants in amine oxide surfactants
US5498373A · kind A · utility
9Cited by
3References
1Claims
0Family size
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Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C291/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Amine oxide surfactants contaminated with nitrite are treated under acidic conditions with materials such as maleic acid and diethylenetriaminepentaacetate (DTPA) to reduce nitrite levels below 1 ppm. Thus, C.sub.12-13 dimethyl amine is oxidized with hydrogen peroxide in the presence of maleic acid and DTPA to reduce nitrite levels. The resulting nitrite-free amine oxide is employed in various detergent compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.