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US 5,190,678 AGranted
Process for the preparation of over-based group 2A metal sulfonate greases and thickened compositions
AssigneeConoco Inc.
InventorsCharles J. Swartz, Bryant J. Hardy
Life of this patent
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Abstract
Group 2A metal greases having a dropping point in excess of 650.degree. F. are produced by a manufacturing process in which water is carefully controlled in the process while conversion to grease is occurring. It is necessary to complete the reaction and dehydrate the reaction mixture before finish oils and additives are added in order to obtain a reproducible grease with a high drop point and a low penetration value.
Claims6
A method for the production of overbased metal sulfonate thickened grease with a dropping point of at least 650.degree. F. comprising:
- (a) mixing base oil, thickener, catalyst and water containing ingredients in a reaction vessel;
- (b) reacting the mixture at a temperature below 210.degree. F. for a time sufficient to reduce the half-scale penetration to a value below 45 mm while venting the vessel to prevent condensation of water within the vessel;
- (c) raising the reactor contents to at least 260.degree. F. with constant stirring and dehydrating the reaction mass by removing the catalyst and water without allowing either to condense and re-enter the vessel;
- then
- (d) adding finish oil as necessary to meet penetration and composition targets.
2 more elements
Dependencies are inferred from the claim text.