Overbased alkali metal alkylhydroxybenzoates having low crude sediment
AssigneeChevron Oronite Company LLC
InventorJean-Louis Le Coent
Life of this patent
Estimating the term…
Abstract
A process for preparing an overbased alkali metal alkylhydroxybenzoate, said process comprising overbasing an alkali metal alkylhydroxybenzoate or a mixture of alkali metal alkylhydroxybenzoate and up to 50 mole % of alkylphenol, based on the total mixture of alkylhydroxybenzoate and alkylphenol, with a molar excess of alkaline earth metal base and at least one acidic overbasing material in the presence of at least one carboxylic acid having from one to four carbon atoms and a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, monoalcohols and mixtures thereof.
Claims104
A process for preparing an overbased alkali metal alkylhydroxybenzoate, said process comprising overbasing an alkali metal alkylhydroxybenzoate or a mixture of alkali metal alkylhydroxybenzoate and up to 50 mole % of alkylphenol, based on the total mixture of alkylhydroxybenzoate and alkylphenol, with a molar excess of alkaline earth metal base and at least one acidic overbasing material in the presence of a mixture of carboxylic acids selected from C1 to C4 carboxylic acids having from one to four carbon atoms and a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, monoalcohols, and mixtures thereof, and further wherein the process results in an overbased alkali metal alkylhydroxybenzoate having less than 3 volume % crude sediment in the absence of a filtration step.
A process for preparing an overbased alkali metal alkylhydroxybenzoate, said process comprising:
- a) reacting alkylphenol with an alkali metal base to produce an alkali metal alkylphenate;
- b) carboxylating the alkali metal alkylphenate obtained in step a) with carbon dioxide so that at least 50 mole % of the starting alkylphenol has been converted to an alkali metal alkylhydroxybenzoate;
- c) contacting the alkali metal alkylhydroxybenzoate in step b) with a mixture of carboxylic acids selected from C1 to C4 carboxylic acids;
- and d) overbasing the mixture of the alkali metal alkylhydroxybenzoate and the mixture of carboxylic acids from step c) with a molar excess of alkaline earth metal base and at least one acidic overbasing material in the presence of a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, monoalcohols, and mixtures thereof, and further wherein the process results in an overbased alkali metal alkylhydroxybenzoate having less than 3 volume % crude sediment in the absence of a filtration step.
A process for preparing an overbased alkali metal alkylhydroxybenzoate, said process comprising:
- a) reacting alkylphenol with an alkali metal base to produce an alkali metal alkylphenate;
- b) carboxylating the alkali metal alkylphenate obtained in step a) with carbon dioxide so that at least 50 mole % of the starting alkylphenol has been converted to an alkali metal alkylhydroxybenzoate;
- c) contacting the alkali metal alkylhydroxybenzoate with a molar excess of alkaline earth metal base and a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, monoalcohols and mixtures thereof;
- d) contacting the mixture of alkali metal alkylhydroxybenzoate and molar excess of alkaline earth metal base and the solvent from step c) with a mixture of carboxylic acids selected from C1 to C4 carboxylic acids;
- and e) overbasing the mixture of alkali metal alkylhydroxybenzoate, the molar excess of alkaline earth metal base, the solvent and the mixture of carboxylic acids from step d) with an acidic overbasing material, and further wherein the process results in an overbased alkali metal alkylhydroxybenzoate having less than 3 volume % crude sediment in the absence of a filtration step.
A lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and a minor amount of an overbased alkali metal alkylhydroxylbenzoate produced by the process comprising overbasing an alkali metal alkylhydroxybenzoate or a mixture of alkali metal alkylhydroxybenzoate and up to 50 mole % of alkylphenol, based on the total mixture of alkylhydroxylbenzoate, with a molar excess of alkaline earth metal base and at least one acidic overbasing material in the presence of a mixture of carboxylic acids selected from C1 to C4 carboxylic acids and a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons and monoalcohols and further wherein the process results in an overbased alkali metal alkylhydroxybenzoate having less than 3 volume % crude sediment in the absence of a filtration step.
A lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and a minor amount of an overbased alkali metal alkylhydroxybenzoate produced by the process comprising:
- a) reacting alkylphenol with an alkali metal base to produce an alkali metal alkylphenate;
- b) carboxylating the alkali metal alkylphenate obtained in step a) with carbon dioxide so that at least 50 mole % of the starting alkylphenol has been converted to an alkali metal alkylhydroxybenzoate;
- c) contacting the alkali metal alkylhydroxybenzoate in step b) with a mixture of carboxylic acids selected from C1 to C4 carboxylic acids;
- and d) overbasing the mixture of the alkali metal alkylhydroxybenzoate and the mixture of carboxylic acids from step c) with a molar excess of alkaline earth metal base and at least one acidic overbasing material in the presence of a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, monoalcohols, and mixtures thereof, and further wherein the process results in an overbased alkali metal alkylhydroxybenzoate having less than 3 volume % crude sediment in the absence of a filtration step.
A lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and a minor amount of an overbased alkali metal alkylhydroxybenzoate produced by the process comprising:
- a) reacting alkylphenol with an alkali metal base to produce an alkali metal alkylphenate;
- b) carboxylating the alkali metal alkylphenate obtained in step a) with carbon dioxide so that at least 50 mole % of the starting alkylphenol has been converted to an alkali metal alkylhydroxybenzoate;
- c) contacting the alkali metal alkylhydroxybenzoate with a molar excess of alkaline earth metal base and a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, monoalcohols, and mixtures thereof;
- d) contacting the mixture of alkali metal alkylhydroxybenzoate and molar excess of alkaline earth metal base and the solvent from step c) with a mixture of carboxylic acids selected from C1 to C4 carboxylic acids;
- and e) overbasing the mixture of alkali metal alkylhydroxybenzoate, the molar excess of alkaline earth metal base, the solvent and the mixture of carboxylic acids from step d) with an acidic overbasing material, and further wherein the process results in an overbased alkali metal alkylhydroxybenzoate having less than 3 volume % crude sediment in the absence of a filtration step.
Dependencies are inferred from the claim text.