Reducing copper corrosiveness of organic sulfides
AssigneeEthyl Petroleum Additives, Inc.
InventorsEdmund F. Perozzi, John F. Sieberth
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Abstract
The copper corrosiveness of organic sulfides is reduced by treating them with an alkali metal-containing or alkaline earth metal-containing substance capable of dissolving elemental sulfur (e.g., sodium hydroxide, sodium sulfide, etc.). The process is conducted in the presence of a phase transfer catalyst in an aqueous liquid reaction medium. Experiments have shown that it is possible by use of this process to reduce the copper corrosiveness to a level below that exhibited by a product formed by treating the same initial organic sulfide in the same way but in the absence of a phase transfer catalyst.
Claims24
A process of reducing the copper corrosiveness of a hydrocarbyl polysulfide in which the average number of sulfur atoms is above 3 that is corrosive toward copper which comprises treating said dihydrocarbyl polysulfide with an alkali metal-containing or alkaline earth metal-containing substance capable of dissolving elemental sulfur, such treatment being effected in the presence of a phase transfer catalyst in an aqueous liquid reaction medium at temperatures between about 35.degree. C. and about 150.degree. C., whereby the treated dihydrocarbyl polysulfide is less corrosive toward copper.
In a process of treating dialkyl polysulfide in which the average number of sulfur atoms is above 3 with an alkaline inorganic substance capable of dissolving elemental sulfur, the improvement which comprises conducting such treatment in the presence of a phase transfer catalyst in an aqueous liquid reaction medium at temperatures between about 35.degree. C. and about 150.degree. C., such that the resultant dialkyl polysulfide exhibits reduced copper corrosiveness.
Dependencies are inferred from the claim text.