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US 4,225,509 AGranted
Process for producing overbased alkaline earth hydrocarbyl sulfonates
AssigneeEthyl Corporation
InventorKishankumar K. Seth
Life of this patent
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Abstract
Overbased alkaline earth metal hydrocarbyl sulfonates are made by injecting carbon dioxide into a mixture of hydrocarbon sulfonic acid, alkaline earth metal base and lower alkanol. Solids are removed using a centrifuge or filter forming a cake of such solids and hydrocarbyl sulfonic acid values. The cake is mixed with an aqueous acid which forms a water-soluble alkaline earth metal salt. The resulting organic phase is separated and hydrocarbyl sulfonic acid is recovered from it.
Claims8
In a process for making an overbased alkaline earth metal hydrocarbyl sulfonate, said process comprising the steps of
- (1) adding an alkaline earth metal base selected from the group consisting of oxides and hydroxides of calcium, magnesium and barium and mixtures thereof to a hydrocarbyl sulfonic acid or alkaline earth metal salt thereof,
- (2) adding a lower alkanol promoter,
- (3) injecting carbon dioxide into the mixture,
- (4) distilling to remove volatiles, and
- (5) removing solids to obtain a clear overbased alkaline earth metal hydrocarbonyl sulfonate,
- the improvement comprising (a) mixing said solids obtained in step (5) with an aqueous acid which forms a water-soluble alkaline earth metal salt thereby dissolving basic alkaline earth metal compound in said solids, (b) separating the resultant mixture into an aqueous phase and an organic phase and (c) removing said organic phase containing hydrocarbyl sulfonic acid.
3 more elements
Dependencies are inferred from the claim text.