Patent US2778926A successfully refreshed from Google Patents.
US2710255A
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Lignosulfonate recovery from waste sulfite liquor
Assignee: Rayonier Inc
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Filing: 1952-06-07
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Granted: 1955-06-07
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Expires: 1972-06-07
Abstract
No abstract record available.
Inventors
- 👤 Lloyd Eugene Van Blaricom
- 👤 Gray Kenneth Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:42
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0042; D21C11/005; D21C11/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR THE SEPARATION OF A LIGNOSULFONATE FRACTION FROM A LIGNOSULFONATE CONTAINING WASTE EFFLUENT WHICH COMPRISES SUBJECTING WASTE LIQUOR FROM THE AMMONIA BASE ACID SULFITE DIGESTION OF WOOD TO STEAM STRIPPING TO REMOVE SULFUR DIOXIDE, TREATING THE STRIPPED LIQUOR CONTAINING THE CATIONS USED AS A PULPING BASE WITH A POROUS ANION EXCHANGE RESIN IN THE BASIC STATE, IN WHICH SUBSTANTIALLY THE ONLY BASIC RADICALS ARE NITROGEN-CONTAINING GROUPS CONSISTING ESSENTIALLY OF TERTIARY AMINO GROUPS AND IN WHICH QUATERNARY AMMONIUM GROUPS IF PRESENT ARE IN MINOR AMOUNTS, WHEREBY A PORTION OF THE LIGNOSULFONATE CONTENT OF THE LIQUOR IS ADSORBED, AND TREATING SAID RESIN CONTAINING ADSORBED LIGNOSULFONATE WITH AN ALKALINE SOLUTION TO FORM A LIGNOSULFONATE SOLUTION SUBSTANTIALLY FREE FROM OTHER ORGANIC COMPONENTS OF THE WASTE LIQUOR.
Claim 2
Dependent Claim
124 words
A PROCESS FOR THE SEPARATION OF A LIGNOSULFONATE FRACTION FROM A LIGNOSULFONATE CONTAINING WASTE EFFLUENT WHICH COMPRISES SUBJECTING WASTE LIQUOR FROM THE AMMONIA BASE ACID SULFITE DIGESTION OF WOOD TO STEAM STRIPPING TO REMOVE SULFUR DIOXIDE, TREATING THE STRIPPED LIQUOR CONTAINING THE CATIONS USED AS A PULPING BASE WITH A POROUS ANION EXCHANGE RESIN IN THE BASIC STATE, IN WHICH SUBSTANTIALLY THE ONLY BASIC RADICALS ARE NITROGEN-CONTAINING GROUPS CONSISTING ESSENTIALLY OF TERTIARY AMINO GROUPS AND IN WHICH QUATERNARY AMMONIUM GROUPS IF PRESENT ARE IN MINOR AMOUNTS, WHEREBY A PORTION OF THE LIGNOSULFONATE CONTENT OF THE LIQUOR IS ADSORBED, AND TREATING SAID RESIN CONTAINING ADSORBED LIGNOSULFONATE WITH AN ALKALINE SOLUTION TO FORM A LIGNOSULFONATE SOLUTION SUBSTANTIALLY FREE FROM OTHER ORGANIC COMPONENTS OF THE WASTE LIQUOR.
References Cited (Backward Citations)
FR859205A
Cited
US2354553A
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US2470764A
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US2470500A
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US2594302A
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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) | 1958-06-06 | 1958-12-06 | 1959-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-06 | 1962-12-06 | 1963-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-06 | 1966-12-06 | 1967-06-07 | $7700.00 | Window Closed / Lapsed |