Process for reducing the levels of nitrite contaminants in amine oxide surfactants
US5466870A · kind A · utility
6Cited by
3References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 5, 1994 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Aug 5, 2014 |
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.