Overbased additives
US4797217A · kind A · utility
3Cited by
18References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1986 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Aug 12, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L1/2437
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A highly basic lithium sulphonate, having a TBN of at least 250 mgKOH/g is prepared by heating a mixture of lithium hydroxide monohydrate and a solvent to remove water as an azeotrope of water and said solvent prior to formation of the lithium salt of the sulphonic acid and subsequently overbasing with carbon dioxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.