Method for preparing very fluid overbased additives having a hig

Details Method for preparing very fluid overbased additives having a hig Method for preparing very fluid overbased additives having a hig

1986-09-30

1988-06-07

Dixon, Jr., William R.

Compositions

Electrolytes for electrical devices

252 18, 252 25, 252 33, 252 334, 252 39, 252 407, C10M12522, C10M13510

Patent

active

047494999

ABSTRACT:
This invention concerns a process for preparing very fluid overbased additives having a high basicity, by contacting an alkaline-earth metal derivative and at least one surfactant with carbon dioxide in a diluent oil and a hydrocarbon-based solvent in the presence of an oxygen-based promoter and a nitrogen-based promoter wherein the carbonation time is comprised between an initial point Po corresponding to the beginning of the temperature plateau of the exothermic reaction and the end point of the carbonation which corresponds to a sudden drop of the alkaline value, the additives according to the invention being utilized in lubricating oils and fuels.

REFERENCES:
patent: 3857790 (1974-12-01), Saunders et al.
patent: 3928216 (1975-12-01), Saunders et al.
patent: 4206062 (1980-06-01), Derbyshire et al.
patent: 4302342 (1981-11-01), Demoures et al.
patent: 4347147 (1982-08-01), Allain et al.
patent: 4435301 (1984-03-01), Brannen et al.
patent: 4464289 (1984-08-01), Le Coent et al.
patent: 4470916 (1984-09-01), Le Coent et al.

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