Patent US390310A successfully refreshed from Google Patents.
Patent US3607143A successfully refreshed from Google Patents.
US3607143A
Expired / Lapsed
US
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Sulfur extraction by sequential contact with vapor and with liquid perchloroethylene
Assignee: Alscoke Ltd
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Filing: 1968-06-24
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Granted: 1971-09-21
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Expires: 1988-06-24
Abstract
Abstract This patent describes a process for the recovery and purification of sulfur which comprises contacting a sulfurbearing ore with hot perchloroethylene vapor, permitting at least some of said vapor to condense on said ore particles, contacting said ore with liquid perchloroethylene in an extraction zone whereby a substantial portion of the elemental sulfur in said ore is extracted into said perchloroethylene phase, and thereafter recovering said elemental sulfur from said perchloroethylene phase. Preferably the perchloroethylene used in the practice of the process is combined with a perchloroethylene stabilizer which retards the decomposition of the perchloroethylene.
Inventors
- 👤 Raymond Wierman
- 👤 William M Haire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:43
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/027; C01B17/033; B; B01; B01D; B01D11/00; B01D11/02; B01D11/0215; B01D11/0223; B01D11/028; B01D2011/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
17 words
The process of claim 1 wherein molten sulfur formed in the course of said evaporation is prilled.
Claim 2
Dependent Claim
31 words
The process of claim 1 wherein said liquid and vapor perchloroethylene contains an effective stabilizing amount of a stabilizer selected from the group consisting of alkyl aryl sulfonates and nonionic surfactants.
Claim 3
Dependent Claim
12 words
The process of claim 3 wherein said stabilizer is a nonionic surfactant.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein said ore is passed through said extraction zone countercurrent to and in contact with said liquid perchloroethylene.
Claim 5
Dependent Claim
43 words
A process according to claim 1 wherein gangue is removed from said extraction zone aNd liquid perchloroethylene is separated therefrom the recycle to said zone, and wherein the residual perchloroethylene in said gangue is evaporated therefrom and recycled for condensation on said ore.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |