US3256059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of sodium carbonate and sodium sulfate from spent sulfite liquor
Assignee: Sonoco Products Co
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Filing: 1963-05-06
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Granted: 1966-06-14
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Expires: 1983-05-06
Abstract
No abstract record available.
Inventors
- 👤 Jr William A Biggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:03
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/06; D21C11/063; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
A CONTINUOUS PROCESS FOR RECOVERING SODIUM SULFATE FROM THE RAFFINATE OF ACID EXTRACTED WASTE SULFITE LIQUOR COMPRISING THE STEPS OF, MIXING WITH SAID RAFFINATE PARTICULATE SODIUM SULFATE AT A TEMPERATURE FOR PRODUCING EVAPORATION OF THE VOLATILE COMPONENTS OF SAID RAFFINATE TO DEPOSIT THE SOLIDS IN SAID RAFFINATE ON THE SURFACE OF SAID PARTICLES, REMOVING THE PRODUCTS OF EVAPORATION FROM SAID MIXTURE, BURNING THE COMBUSTIBLE CONSTITUENTS OF SAID MIXTURE TO OBTAIN A RESIDUE OF SODIUM SULFATE AT APPROXIMATELY SAID MIXING TEMPERATURE AND RECYCLING A PORTION OF SAID RESIDUE TO PROVIDE THE SODIUM SULFATE MIXED WITH SAID RAFFINATE IN SAID MIXING STEP.
Claim 2
Dependent Claim
100 words
A CONTINUOUS PROCESS FOR RECOVERING SODIUM SULFATE FROM THE RAFFINATE OF ACID EXTRACTED WASTE SULFITE LIQUOR COMPRISING THE STEPS OF, MIXING WITH SAID RAFFINATE PARTICULATE SODIUM SULFATE AT A TEMPERATURE FOR PRODUCING EVAPORATION OF THE VOLATILE COMPONENTS OF SAID RAFFINATE TO DEPOSIT THE SOLIDS IN SAID RAFFINATE ON THE SURFACE OF SAID PARTICLES, REMOVING THE PRODUCTS OF EVAPORATION FROM SAID MIXTURE, BURNING THE COMBUSTIBLE CONSTITUENTS OF SAID MIXTURE TO OBTAIN A RESIDUE OF SODIUM SULFATE AT APPROXIMATELY SAID MIXING TEMPERATURE AND RECYCLING A PORTION OF SAID RESIDUE TO PROVIDE THE SODIUM SULFATE MIXED WITH SAID RAFFINATE IN SAID MIXING STEP.
Claim 3
Dependent Claim
103 words
A CONTINUOUS PROCESS FOR RECOVERING SODIUM CARBONATE FROM SODIUM BASED SULFITE BLACK LIQUOR COMPRISING THE STEPS OF, MIXING WITH SAID BLACK LIQUOR PARTICULATE SODIUM CARBONATE AT A TEMPERATURE FOR PRODUCING EVAPORATION OF THE VOLATILE COMPONENTS OF SAID BLACK LIQUOR TO DEPOSIT THE SOLIDS IN SAID LIQUOR ON THE SURFACE OF SAID SODIUM CARBONATE PARTICLES, REMOVING THE PRODUCTS OF EVAPORATION FROM SAID MIXTURE, BURNING THE COMBUSTIBLE CONSTITUENTS IN SAID MIXTURE TO OBTAIN A RESIDUE OF SODIUM CARBONATE AT APPROXIMATELY SAID MIXING TEMPERATURE AND RECYCLING A PORTION OF SODIUM CARBONATE RESIDUE TO PROVIDE THE SODIUM CARBONATE MIXED WITH SAID BLACK LIQUOR IN SAID MIXING STEP.
Claim 4
Dependent Claim
103 words
A CONTINUOUS PROCESS FOR RECOVERING SODIUM CARBONATE FROM SODIUM BASED SULFITE BLACK LIQUOR COMPRISING THE STEPS OF, MIXING WITH SAID BLACK LIQUOR PARTICULATE SODIUM CARBONATE AT A TEMPERATURE FOR PRODUCING EVAPORATION OF THE VOLATILE COMPONENTS OF SAID BLACK LIQUOR TO DEPOSIT THE SOLIDS IN SAID LIQUOR ON THE SURFACE OF SAID SODIUM CARBONATE PARTICLES, REMOVING THE PRODUCTS OF EVAPORATION FROM SAID MIXTURE, BURNING THE COMBUSTIBLE CONSTITUENTS IN SAID MIXTURE TO OBTAIN A RESIDUE OF SODIUM CARBONATE AT APPROXIMATELY SAID MIXING TEMPERATURE AND RECYCLING A PORTION OF SODIUM CARBONATE RESIDUE TO PROVIDE THE SODIUM CARBONATE MIXED WITH SAID BLACK LIQUOR IN SAID MIXING STEP.
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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |