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US 5,206,439 AGranted
Preparation of high purity polysulfides
AssigneePhillips Petroleum Company
InventorJames E. Shaw
Life of this patent
Estimating the term…
Abstract
Product from the reaction of mercaptan with sulfur in the presence of a basic catalyst is treated by contacting with an alcohol-based solution containing an oxidizing agent and an inorganic basic catalyst followed by the recovery of a purified polysulfide product.
Claims32
A process for purifying a polysulfide comprising the steps of:
- (a) contacting said polysulfide with an alcohol-based wash solution comprising at least 50 wt % alcohol, an oxidizing agent which has some solubility in said alcohol and negligible solubility in said polysulfide, and an inorganic basic catalyst to give a washed polysulfide-bearing lower phase and a spent wash solution upper phase;
- (b) separating said washed polysulfide-bearing lower phase from said spent wash solution upper phase to obtain a washed polysulfide and a spent wash solution;
- and
- (c) recovering from said washed polysulfide a purified polysulfide product.
1 more element
A process for purifying a di-t-nonyl polysulfide comprising the steps of:
- (a) contacting said polysulfide with a wash solution comprising at least 50 wt % methanol, aqueous hydrogen peroxide, and sodium hydroxide catalyst to give a washed polysulfide lower phase and a spent wash solution upper phase;
- (b) separating said washed polysulfide lower phase from said spent wash solution upper phase to obtain a washed polysulfide and spent wash solution;
- and
- (c) removing said washed polysulfide of residuals, such as alcohol and water, to obtain a purified polysulfide.
1 more element
A process for purifying a di-t-dodecyl polysulfide comprising the steps of:
- (a) contacting said polysulfide with a wash solution comprising at least 50 wt % methanol, aqueous hydrogen peroxide, and sodium hydroxide catalyst to give a washed polysulfide lower phase and a spent wash solution upper phase;
- (b) separating said washed polysufide lower phase from said spent wash solution upper phase to obtain a washed polysulfide and a spent wash solution;
- and
- (c) removing said washed polysulfide of residuals, such as alcohol and water, to obtain a purified polysulfide wherein said removing step is selected from the group consisting of heating, inert gas purging and vacuum stripping.
1 more element
Dependencies are inferred from the claim text.