Use of a zwitterionic surfactant together with an anionic ether-containing surfactant as a drag-reducing agent
US8375971B2 · kind B2 · utility
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8References
11Claims
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Key dates
| Filing date | Jun 21, 2011 |
| Grant date | Feb 19, 2013 |
| Priority date | — |
| Expiry date | Jun 21, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0391
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to the use of a zwitterionic surfactant in combination with an ether sulphate or ether carboxylate surfactant in a water-based system as a drag-reducing agent. The combination has besides a high drag-reducing effect also a low sensitivity to hard water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.