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US 4,751,010 AGranted
Sulfonated and sulfurized detergent-dispersant additives for lubricating oils
AssigneeOrogil
InventorsSavino Leone, Henri Gaessler
Life of this patent
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Abstract
Disclosed are detergent-dispersant additives useful in lubricating oils prepared by neutralizing an alkylphenol sulfonic acid, followed by sulfurizing/over-alkalinizing the salt obtained and then carbonating the resultant salt. Lubricating compositions comprising a lubricating oil and from about 1 to about 30% by weight of the final composition of a detergent-dispersant additive of the invention are also disclosed.
Claims23
A detergent-dispersant additive for lubricating oils made by a process comprising:
- (a) neutralizing, in the presence of a first solvent capable of forming an azeotrope with water, an alkylphenol sulfonic acid having a number of sulfonate (HSO.sub.3) functional groups ranging from 6 to 35 sulfonate functional groups per hundred hydroxyl (OH) functional groups by means of an alkaline-earth base, thus producing a salt, wherein the molar ratio of alkaline-earth base to sulfonate functional group is at least about 1;
- (b) sulfurizing and over-alkalinizing said salt by contacting said salt with sulfur in the presence of (i) an alkaline-earth base that is added to the reaction medium, (ii) a second solvent comprising a vector alcohol selected from the group consisting of alkylene glycols and alkoxy alkanols and mixtures thereof, and (iii) a third solvent having a boiling point above 120.degree. C. selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons and alcohols and mixtures thereof to produce a sulfurized alkylphenate sulfonate, the quantities of reagents used corresponding to the following molar ratios:
- sulfur/initial alkylphenol sulfonic acid ranging from about 0.4 to about 1.3
- total alkaline-earth base/initial alkylphenol sulfonic acid ranging from about 1.5 to about 2.2
- sulfurization-over-alkalinization alkaline-earth base/vector alcohol ranging from about 1.4 to about 2.5;
- (c) carbonating said sulfurized alkylphenate sulfonate with carbon dioxide at a temperature in the range of about 100.degree. to about 185.degree. C. under a pressure of about 93.times.10.sup.3 to about 101.times.10.sup.3 Pa, the amount of said carbon dioxide used being between that which can be completely absorbed by the reaction medium and an excess of about 30% over said amount;
- (d) adding dilution oil;
- (e) removing by distillation the second solvent, water and the third solvent;
- and
- (f) removing the sediments.
7 more elements
A process for preparing a detergent-dispersant additive comprising:
- (a) neutralizing in the presence of a first solvent capable of forming an azeotrope with water an alkylphenol sulfonic acid having a number of sulfonate (HSO.sub.3) functional groups ranging from 6 to 35 sulfonate functional groups per hundred hydroxyl (OH) functional groups by means of an alkaline-earth base thus producing a salt, wherein the molar ratio of alkaline-earth base to sulfonate functional group is at least about 1;
- (b) sulfurizing and over-alkalinizing said salt by contacting said salt with sulfur in the presence of (i) an alkaline-earth base that is added to the reaction medium, (ii) a second solvent comprising a vector alcohol selected from the group consisting of alkylene glycols and alkoxy alkanols and mixtures thereof, and (iii) a third solvent having a boiling point above 120.degree. C. selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons and alcohols and mixtures thereof to produce a sulfurized alkylphenyl sulfonate, the quantities of reagents used corresponding to the following molar ratios:
- sulfur/initial alkylphenol sulfonic acid ranging from about 0.4 to about 1.3
- total alkaline-earth base/initial alkylphenol sulfonic acid ranging from about 1.5 to about 2.2
- sulfurization-over-alkalinization alkaline-earth base/vector alcohol, ranging from about 1.4 to about 2.5;
- (c) carbonating said sulfurized alkylphenate sulfonate with carbon dioxide at a temperature in the range of about 100.degree. to about 185.degree. C. under a pressure of about 93.times.10.sup.3 to about 101.times.10.sup.3 Pa, the amount of said carbon dioxide used being between that which can be completely absorbed by the reaction medium and an excess of about 30% over said amount;
- (d) adding dilution oil;
- (e) removing by distillation the second solvent, water and the third solvent;
- and
- (f) removing the sediments.
7 more elements
Dependencies are inferred from the claim text.