US3867514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of sulfur values from molten salt
Assignee: Boeing North American Inc
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Filing: 1973-05-16
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Granted: 1975-02-18
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Expires: 1993-05-16
Abstract
Abstract A process for recovering sulfur values from a molten salt containing alkali metal sulfides by treating the sulfidecontaining molten salt with a gaseous mixture containing carbon dioxide and steam at a temperature below 600*C to form alkali metal carbonates in the molten salt and hydrogen sulfide, the steam for the reaction being provided by injecting water directly into the reaction zone at a plurality of reaction sites, the conversion of water to steam also serving to maintain the desired reaction temperature within the reaction zone.
Inventors
- 👤 Keith A Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:42
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/16; C01B17/165; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
IN A PROCESS FOR RECOVERING SULFUR VALUES AS HYDROGEN SULFIDE GAS FROM ALKALI METAL SULFIDES AS REACTIVE MATERIAL CONTAINED IN AN INORGANIC MOLTEN SALT IN A REACTION ZONE, WHEREIN SAID MOLTEN SALT IS CONTACTED WITH A GASEOUS MIXTURE CONTAINING CARBON DIOXIDE AND STEAM AT A SELECTED REACTION TEMPERATURE BELOW 600*C AT WHICH THE ALKALI METAL SULFIDE-CONTAINING SALT IS MOLTEN TO FORM ALKALI METAL CARBONATES IN SAID MOLTEN SALT AND HYDROGEN SULFIDE GAS AS A RECOVERABLE PRODUCT, THE IMPROVEMENT WHICH COMPRISES INJECTING WATER DIRECTLY INTO SAID REACTION ZONE AT A PLURALITY OF REACTION SITES THEREIN, SAID WATER BEING CONVERTED TO STEAM TO PROVIDE AT LEAST A PORTION OF THE REACTANT STEAM FOR THE REACTION IN SAID ZONE WHILE AT THE SAME TIME MAINTAINING THE REACTION TEMPERATURE IN SAID ZONE AT SAID SELECTED TEMPERATURE.
Claim 2
Dependent Claim
132 words
IN A PROCESS FOR RECOVERING SULFUR VALUES AS HYDROGEN SULFIDE GAS FROM ALKALI METAL SULFIDES AS REACTIVE MATERIAL CONTAINED IN AN INORGANIC MOLTEN SALT IN A REACTION ZONE, WHEREIN SAID MOLTEN SALT IS CONTACTED WITH A GASEOUS MIXTURE CONTAINING CARBON DIOXIDE AND STEAM AT A SELECTED REACTION TEMPERATURE BELOW 600*C AT WHICH THE ALKALI METAL SULFIDE-CONTAINING SALT IS MOLTEN TO FORM ALKALI METAL CARBONATES IN SAID MOLTEN SALT AND HYDROGEN SULFIDE GAS AS A RECOVERABLE PRODUCT, THE IMPROVEMENT WHICH COMPRISES INJECTING WATER DIRECTLY INTO SAID REACTION ZONE AT A PLURALITY OF REACTION SITES THEREIN, SAID WATER BEING CONVERTED TO STEAM TO PROVIDE AT LEAST A PORTION OF THE REACTANT STEAM FOR THE REACTION IN SAID ZONE WHILE AT THE SAME TIME MAINTAINING THE REACTION TEMPERATURE IN SAID ZONE AT SAID SELECTED TEMPERATURE.
Claim 3
Dependent Claim
20 words
The process according to claim 1 wherein the reaction is performed at a selected temperature between about 400* and 550*C.
Claim 4
Dependent Claim
20 words
The process according to claim 1 wherein the reaction is performed at a selected temperature between about 450* and 500*C.
Claim 5
Dependent Claim
33 words
The process according to claim 1 wherein said molten salt prior to reaction with said gaseous mixture consists essentially of a molten mixture of the sulfides and carbonates of lithium, sodium, and potassium.
Claim 6
Dependent Claim
22 words
The process according to claim 1 wherein said molten salt is passed downwardly in countercurrent relation to said gaseous mixture flowing upwardly.
Claim 7
Dependent Claim
27 words
The process according to claim 5 wherein each of said reaction sites comprises a sieve bubble tray, the water being injected separately at each said reaction sites.
Claim 8
Dependent Claim
35 words
The process according to claim 1 wherein a major portion of the steam required for the regeneration reaction is provided by the water injected into said reaction zone at said plurality of reaction sites therein.
Claim 9
Dependent Claim
28 words
The process according to claim 7 wherein each of said reaction sites comprises a sieve bubble tray, the water being injected separately at each of said reaction sites.
Claim 10
Dependent Claim
32 words
The process according to claim 8 wherein said molten salt prior to reaction with said gaseous mixture consists essentially of a molten mixture of sulfides and carbonates of lithium, sodium and potassium.
Claim 11
Dependent Claim
20 words
The process according to claim 9 wherein the reaction is performed at a selected temperature between about 400* and 550*C.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |