Non-foaming detergent-dispersant additives for lubricating oils and process for making such additives
AssigneeOrogil
InventorJean-Louis Le Coent
Life of this patent
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Abstract
Disclosed are detergent-dispersant additives for lubricating oils that are made by contacting an alkylarylsulfonic acid with an alkaline earth base in the presence of an alcohol having a boiling point in excess of 80.degree. C., water, chloride ions and preferably a C.sub.1 -C.sub.4 carboxylic acid. The products may be made more basic by carbonation. The disclosed additives, when not carbonated, have a TBN up to about 40 and, when carbonated, have a TBN of up to about 100.
Claims27
A detergent-dispersant additive for lubricating oils made by a process comprising the following steps:
- (a) reacting in a diluent oil an alkylarylsulfonic acid with an alkaline earth base, the amounts of reactants used being such that the molar ratio of the alkaline earth base to the alkyl aryl sulfonic acid in the reaction medium is between about 0.51 and about 1.8;
- (b) contacting the materials specified in step (a), or their reaction product, with one or more linear or branched aliphatic monohydric alcohols having from 4 to 10 carbon atoms in the presence of water and chloride ions, with the molar ratios of the constituents being:
- (i) for the chloride ion to the alkylarylsulfonic acid, between about 0.005 and about 0.2;
- (ii) for the alcohol to the alkylarylsulfonic acid, greater than or equal to about 0.1;
- and
- (iii) for the water to the alkylarylsulfonic acid, between about 0.2 and about 5;
- (c) removing water and alcohol from the product obtained in step (b);
- and
- (d) removing solid substances from the product obtained in step (c).
A process for making a detergent-dispersant additive comprising the steps of:
- (a) reacting in a diluent oil an alkylarylsulfonic acid with an alkaline earth base, the amounts of reactants used being such that the molar ratio of the alkaline earth base to the alkyl aryl sulfonic acid in the reaction medium is between about 0.51 and about 1.8;
- (b) contacting the materials specified in step (a), or their reaction product, with one or more linear or branched aliphatic monohydric alcohols having from 4 to 10 carbon atoms in the presence of water and chloride ions, with the molar ratios of the constituents being:
- (i) for the chloride ion to the alkylarylsulfonic acid, between about 0.005 and about 0.2;
- (ii) for the alcohol to the alkylarylsulfonic acid, greater than or equal to about 0.1;
- and
- (iii) for the water to the alkylarylsulfonic acid, between about 0.2 and about 5;
- (c) removing water and alcohol from the product obtained in step (b);
- and
- (d) removing solid substances from the product obtained in step (c).
Dependencies are inferred from the claim text.