Weakly coloured sulfonic acid
US11040940B2 · kind B2 · utility
0Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2018 |
| Grant date | Jun 22, 2021 |
| Priority date | — |
| Expiry date | Aug 30, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F11/181
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The subject of the present invention is a weakly corrosive and weakly coloured sulfonic acid, with an APHA colour index of less than 20, comprising chlorides and nitrites in a chloride/sulfonic acid molar ratio of between 1 ppm and 200 ppm, and a nitrite/sulfonic acid molar ratio of between 200 ppm and 6000 ppm, limits inclusive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.