Patent US3762880A successfully refreshed from Google Patents.
US3762880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for crystallization and recovery of elemental sulfur from solvents
Assignee: Chapman Wood and Griswold Ltd
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Filing: 1971-12-30
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Granted: 1973-10-02
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Expires: 1991-12-30
Abstract
Abstract Apparatus for the crystallization and recovery of sulfur including a crystallizer vessel with inlet means for introducing a solvent with sulfur dissolved therein into the vessel at one level, and means for injecting an immiscible heat-exchange liquid at a different temperature from that of the solvent into the vessel at at least one other level different from the first level. The apparatus includes individual means for withdrawing heat-exchange liquid from the vessel, means for withdrawing crystalline sulfur slurry therefrom, and means for separating sulfur from this slurry.
Inventors
- 👤 L Tisdel
- 👤 H Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:06
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/0205; C01B17/027; C01B17/033
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
21 words
Apparatus as claimed in claim 1 including means for recycling said withdrawn heat-exchange liquid to said inlets of the crystallizer vessel.
Claim 2
Dependent Claim
36 words
An apparatus according to claim 1 wherein said crystallizer vessel is equipped with a plurality of vertically spaced and downwardly inclined ring baffles to insure staged mixing and enhance the temperature gradient of the flowing solvent.
Claim 3
Dependent Claim
29 words
An apparatus according to claim 1 wherein said crystallizer vessel is equipped with circumferentially spaced vertical baffles to insure intimate contact with between said solvent and said heat-exchange liquid.
Claim 4
Dependent Claim
24 words
Apparatus as claimed in claim 1 including means for directing heat-exchange liquid withdrawn from the upper end of the vessel back to said inlets.
Claim 5
Dependent Claim
32 words
Apparatus as claimed in claim 5 including means for transfering heat between said heat-exchange liquid withdrawn from the upper end of the vessel and said lean solvent separated from said withdrawn sulfur.
Claim 6
Dependent Claim
56 words
Apparatus as claimed in claim 1 including means for directing a first portion of the heat-exchange liquid withdrawn from the upper end of the vessel back to said inlets, means for cooling a second portion of said withdrawn heat-exchange liquid, and means for directing said cooled second portion of the heat-exchange liquid back to said inlets.
Claim 7
Dependent Claim
41 words
Apparatus as claimed in claim 7 including means for intermixing said first and second portions of the heat-exchange liquid at each of said inlets to control the temperature of the heat-exchange liquid being directd into the vessel through said each inlet.
Claim 8
Dependent Claim
42 words
Apparatus as claimed in claim 1 including means for maintaining a predetermined level of sulfur-pregnant solvent in the vessel so as to control the level of an interface between said solvent and said heat-exchange liquid near the upper end of the vessel.
Claim 9
Dependent Claim
26 words
Apparatus as claimed in claim 9 in which said inlet means is positioned to direct sulfur pregnant solvent into the vessel below said predetermined interface level.
Claim 10
Dependent Claim
23 words
Apparatus as claimed in claim 9 including means for controlling the rate of withdrawal of lean solvent and crystalline sulfur from the vessel.
Claim 11
Dependent Claim
30 words
Apparatus as claimed in claim 9 including means responsive to the level of said interface for controlling the rate of withdrawal of lean solvent and crystalline sulfur from the vessel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |