Process for preparing overbased calcium sulfonates
US4929373A · kind A · utility
4Cited by
10References
8Claims
0Family size
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Key dates
| Filing date | Oct 10, 1989 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Oct 10, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M159/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In the preparation of an overbased calcium sulfonate, it has been found that adding the calcium hydroxide during the carbonation reaction reduced solid waste. An initial charge of 15 to 25 wt % of the total calcium hydroxide is added to initiate the carbonation reaction. The balance is added by a process whereby calcium hydroxide concentration remains low in the reaction admixture to reduce amorphous calcium carbonate residence time. In the process, calcium hydroxide is added in amounts whereby the molar ratio of carbon dioxide to the sum of calcium hydroxide and calcium oxide is about 0.8.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.