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US 5,849,677 AGranted
Sulfurized olefin composition and its method of preparation
AssigneeExxon Chemical Patents Inc.
InventorMichael Gerald Romanelli
Life of this patent
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Abstract
This invention concerns a process for preparing a sulfurized olefin containing reduced amounts of thiones using a low molecular weight hydrocarbon to precipitate the thiones from the sulfurized olefin.
Claims12
A process for preparing a sulfurized olefin containing low levels of thiones, which comprises:
- (a) contacting sulfur with at least one olefin to form a sulfurized olefin composition,
- (b) removing at least a major amount of unreacted olefin from the sulfurized olefin composition formed in (a),
- (c) contacting the sulfurized olefin composition from (b) with a low molecular weight hydrocarbon to precipitate at least a major amount of the thione components,
- (d) removing the precipitated thione components from the product formed in (c), and
- (e) recovering the sulfurized olefin from the low molecular weight hydrocarbon.
2 more elements
A process for preparing a sulfurized isobutylene containing low levels of thiones, which comprises:
- (a) contacting sulfur with isobutylene at a temperature ranging from about 140.degree. to about 180.degree. C. while maintaining pressure below about 210 psig to form a sulfurized isobutylene composition,
- (b) removing at least a major amount of unreacted isobutylene from the sulfurized isobutylene composition formed in (a),
- (c) extracting the sulfurized isobutylene composition with a saturated C3 to C5 hydrocarbon at a temperature between -80.degree. and -35.degree. C. for a period of time sufficent to precipitate at least a major amount of the thione components,
- (d) removing the precipitated thione components by decantation or filtration,
- (e) removing the propane, and
- (f) recovering the sulfurized isobutylene.
3 more elements
Dependencies are inferred from the claim text.