Patent US2070987A successfully refreshed from Google Patents.
Patent US3337294A successfully refreshed from Google Patents.
US3337294A
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Process for recovering sodium carbonate and hydrogen sulfide from spent cooking liquor
Assignee: Mitsubishi Engineering and Shipbuilding Co Ltd
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Filing: 1966-06-08
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Granted: 1967-08-22
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Expires: 1986-06-08
Abstract
No abstract record available.
Inventors
- 👤 Ono Masao
- 👤 Horiguchi Tutomu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:26
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/12; D21C11/122; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PROCESS OF CONVERTING A SPENT COOKING LIQUOR CONTAINING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFITE AND SODIUM BISULFITE INTO SODIUM CARBONATE AND HYDROGEN SULFIDE COMPRISING: CONCENTRATING AND BURNING THE SPENT COOKING LIQUOR TO FORM A SMELT CONTAINING SODIUM SULFIDE; COOLING THE SMELT TO SOLIDIFY IT; SUBDIVIDING THE SOLIDIFIED SMELT INTO PARTICLES OF AN AVERAGE SIZE OF ABOUT FROM 50 TO 100 MESH; AND CONTACTING THE PARTICLES WITH A GASEOUS MIXTURE COMPRISING CARBON DIOXIDE AND WATER VAPOR AT A TEMPERATURE OF FROM ROOM TEMPERATURE TO 100*C., THE MOLAR PROPORATION OF THE CARBON DIOXIDE TO THE SODIUM SULFIDE IN THE SMELT BEING AT LEST ABOUT ONE AND THE MOLAR PROPORTION OF THE WATER VAPOR T THE SODIUM SULFIDE IN THE SMELT BEING ABOUT FROM 1 TO 4, TO PRODUCE SODIUM CARBONATE AND HYDROGEN SULFIDE.
Claim 2
Dependent Claim
136 words
A PROCESS OF CONVERTING A SPENT COOKING LIQUOR CONTAINING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFITE AND SODIUM BISULFITE INTO SODIUM CARBONATE AND HYDROGEN SULFIDE COMPRISING: CONCENTRATING AND BURNING THE SPENT COOKING LIQUOR TO FORM A SMELT CONTAINING SODIUM SULFIDE; COOLING THE SMELT TO SOLIDIFY IT; SUBDIVIDING THE SOLIDIFIED SMELT INTO PARTICLES OF AN AVERAGE SIZE OF ABOUT FROM 50 TO 100 MESH; AND CONTACTING THE PARTICLES WITH A GASEOUS MIXTURE COMPRISING CARBON DIOXIDE AND WATER VAPOR AT A TEMPERATURE OF FROM ROOM TEMPERATURE TO 100*C., THE MOLAR PROPORATION OF THE CARBON DIOXIDE TO THE SODIUM SULFIDE IN THE SMELT BEING AT LEST ABOUT ONE AND THE MOLAR PROPORTION OF THE WATER VAPOR T THE SODIUM SULFIDE IN THE SMELT BEING ABOUT FROM 1 TO 4, TO PRODUCE SODIUM CARBONATE AND HYDROGEN SULFIDE.
References Cited (Backward Citations)
US951243A
Cited
US3111377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |