Dioxane removal from ether sulfate
US4285881A · kind A · utility
13Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1980 |
| Grant date | Aug 25, 1981 |
| Priority date | — |
| Expiry date | Apr 7, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C303/42
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Dioxane impurities in ether sulfates are removed by using a novel steam stripping technique in which water is neither added to nor removed from ether sulfate. This is possible because the chemical potential of water in the vapor phase is kept at the same value as that of water in the solution phase. In this way, thickening and foaming are avoided while dioxane levels can be reduced to below 10 parts per million by weight in a single pass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.