Claims
- 1. Process for preparing a grease composition comprising:
- (a) preparing a mixture of:
- (aa) an alkaline earth metal petroleum sulfonate obtained from an oil base stock having a viscosity in the range of 180 to 230 SUS at 99.degree. C. and a viscosity index of at least 85,
- (bb) an alkaline earth metal oxide or hydroxide,
- (cc) an alcohol,
- (dd) a lower molecular weight sulfonic acid derivative selected from the group consisting of:
- derivatives corresponding to the formula RSO.sub.3 M, where M is hydrogen, ammonium, or an alkali metal and R is phenyl or alkyl substituted phenyl, said alkyl having 1 to 24 carbon atoms, and
- alkali metal and ammonium salts of a petroleum sulfonic acid having an average number of carbon atoms of 6 to 30,
- (ee) a lubricating oil, and
- (ff) with the further proviso that the lower molecular weight sulfonic acid derivative is employed in a quantity in the range of 2 to 25 parts by weight based on 100 parts by weight of the alkaline earth metal petroleum sulfonate, and
- (b) contacting the mixture with carbon dioxide optionally in the presence of a solvent
- (c) removing said alcohol, solvent when employed and any water from the mixture and recovering said grease composition.
- 2. Process in accordance with claim 1 wherein said mixture further comprises an organic solvent.
- 3. Process in accordance with claim 1 wherein said lubricating oil is a Mid-Continent lubricating oil having a viscosity in the range of about 40 to 200 SUS at 37.8.degree. C.
- 4. Process in accordance with claim 1 wherein the lower molecular weight sulfonic acid derivative is selected from the group consisting of benzenesulfonic acid, p-toluenesulfonic acid, 3,5-dimethylbenzenesulfonic acid, 2,4,6-trimethylbenzenesulfonic acid, 4-t-butylbenzenesulfonic acid, 3-methyl-5-n-propylbenzenesulfonic acid, 3-n-hexylbenzenesulfonic acid, 4-n-dodecylbenzenesulfonic acid, 3,5-di-n-dodecylbenzenesulfonic acid, 4-cetylbenzenesulfonic acid, 4-stearylbenzenesulfonic acid, and mixtures thereof.
- 5. Process in accordance with claim 1 wherein the amount of lower molecular weight sulfonic acid derivative is in the range of about 3 to 10 parts by weight per 100 parts by weight of alkaline earth metal petroleum sulfonate.
- 6. Process in accordance with claim 1 wherein the carbon dioxide-contacted mixture is treated to remove residual solids and volatile compounds subsequent to the contacting with CO.sub.2.
- 7. Process in accordance with claim 1 wherein the alcohol has from 1 to 4 carbon atoms and the amount of alcohol employed is in the range of from about 3.5 to about 8% by weight based on the total weight of lubricating oil, alkaline earth metal petroleum sulfonate, sulfonic acid derivative and solvent when employed.
- 8. Process in accordance with claim 1 wherein the temperature in the carbon dioxide-contacting step is in the range of about 25.degree. to 80.degree. C.
- 9. Process in accordance with claim 1 wherein the amount of carbon dioxide added during step b is sufficient to add about 0.2 to 0.8 moles of carbon dioxide per mole of alkaline earth metal hydroxide or oxide.
Parent Case Info
This application is a divisional of U.S. Pat. application having Ser. No. 030,965, filed Apr. 17, 1979 now U.S. Pat. No. 4,261,840.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
Country |
Parent |
30965 |
Apr 1979 |
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