US3617529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of elemental sulfur contaminants from petroleum oils
Assignee: Shell USA Inc
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Filing: 1969-03-17
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Granted: 1971-11-02
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Expires: 1989-03-17
Abstract
Abstract Elemental sulfur is separated from oil containing 0.3-5 percent elemental sulfur, the oil being used as the carrier vehicle for pipeline transportation of sulfur-oil slurries. The contaminated oil is contacted with an aqueous solution containing a mixture of sodium hydrosulfide and ammonium hydroxide; the oil phase is separated from the aqueous phase; the aqueous phase is heated at about 240* F. to form elemental sulfur and the aqueous phase is filtered after cooling to recover sulfur.
Inventors
- 👤 William H Thompson
- 👤 Eldred E Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
F; F17; F17D; F17D1/00; F17D1/08; F17D1/16; C; C10; C10G; C10G19/00; C10G19/02; F17D1/088
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
147 words
A method of pipeline-transporting a sulfur-crude oil slurry over great distances and at the terminal end of the pipeline separating the sulfur-crude oil slurry into its component parts and purifying the sulfur-contaminated oil component the steps comprising: a. forming a sulfur-oil slurry by injecting molten sulfur into oil; b. injecting slurry (a) into a pipeline and transporting said slurry to a terminal station; c. separating the sulfur phase from the oil contaminated with up to 5 percent elemental sulfur; d. treating the separated sulfur-contaminated oil of phase (c) with an aqueous solution containing a mixture of sodium hydrosulfide and ammonium hydroxide and having a pH of at least 7; e. separating the essentially sulfur-free crude oil phase from the aqueous phase; f. heating the aqueous phase (e) to about 240* F. to form elemental sulfur, and g. filtering said aqueous phase after cooling to recover sulfur therefrom.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |