Patent US2768176A successfully refreshed from Google Patents.
US2768176A
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Process for the recovery of furfural and a fuel from waste bisulfite liquor
Assignee: SNIA Viscosa SpA
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Filing: 1952-01-23
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Granted: 1956-10-23
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Expires: 1972-01-23
Abstract
No abstract record available.
Inventors
- 👤 Diotti Giacinto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:33
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007; C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/40; C07D307/46; C07D307/48; C07D307/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN A PROCESS FOR THE RECOVERY OF FURFURAL AND FUEL FROM WASTE BISULFITE LIQUOR IN A CONCENTRATOR COMPRISING EVAPORATING THE LIQUOR IN A FIRST CONCENTRATION STAGE TO RAISE THE PENTOSE CONTENT THEREOF AND CYCLIZING THE PENTOSES AND HEXOSES CONTAINED IN THE CONCENTRATED LIQUOR TO FORM FURFURAL THEREIN, THAT IMPROVEMENT IN THE CONSERVATION OF HEAT UTILIZED IN CONCENTRATING THE LIQUOR AND CYCLING THE CONTENTS THEREOF CONSISTING OF EVAPORATIVELY CONCENTRATING THE FURFURAL CONTAINING LIQUOR UNDER SUPERATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF ABOUT 100*-125* C. TO FORM A LOW GRADE FUEL RESIDUE AND A CONDENSATE CONTAINING FURFURAL, SAID CONDENSATE CONTAINING FURFURAL BEING SUITABLE FOR THE RECOVERY OF PURE FURFURAL THEREFROM BY DISTILLATION, RECOVERING THE HEAT EVOLVED BY THE CONDENSATION OF SAID FURFURAL IN A HEAT EXCHANGER AND RETURNING THE HEAT WHICH IS SO RECOVERED TO SAID FIRST CONCENTRATION STAGE.
Claim 2
Dependent Claim
137 words
IN A PROCESS FOR THE RECOVERY OF FURFURAL AND FUEL FROM WASTE BISULFITE LIQUOR IN A CONCENTRATOR COMPRISING EVAPORATING THE LIQUOR IN A FIRST CONCENTRATION STAGE TO RAISE THE PENTOSE CONTENT THEREOF AND CYCLIZING THE PENTOSES AND HEXOSES CONTAINED IN THE CONCENTRATED LIQUOR TO FORM FURFURAL THEREIN, THAT IMPROVEMENT IN THE CONSERVATION OF HEAT UTILIZED IN CONCENTRATING THE LIQUOR AND CYCLING THE CONTENTS THEREOF CONSISTING OF EVAPORATIVELY CONCENTRATING THE FURFURAL CONTAINING LIQUOR UNDER SUPERATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF ABOUT 100*-125* C. TO FORM A LOW GRADE FUEL RESIDUE AND A CONDENSATE CONTAINING FURFURAL, SAID CONDENSATE CONTAINING FURFURAL BEING SUITABLE FOR THE RECOVERY OF PURE FURFURAL THEREFROM BY DISTILLATION, RECOVERING THE HEAT EVOLVED BY THE CONDENSATION OF SAID FURFURAL IN A HEAT EXCHANGER AND RETURNING THE HEAT WHICH IS SO RECOVERED TO SAID FIRST CONCENTRATION STAGE.
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) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |