US2559607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of furfural from pentose liquors
Assignee: Individual
•
Filing: 1948-07-02
•
Granted: 1951-07-10
•
Expires: 1968-07-02
Abstract
No abstract record available.
Inventors
- 👤 John W Dunning
- 👤 Charles F Frye
- 👤 Elbert C Lathrop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:33
CPC Classifications
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
97 words
A PROCESS FOR THE PRODUCTION OF FURFURAL WHICH COMPRISES HEATING A SOLUTION CONTAINING 1 1/2 TO 10 PERCENT XYLOSE AND 1 1/2 TO 5 PERCENT SULFURIC ACID TO A TEMPERATURE OF 140* TO 165* C. TO CONVERT THE XYLOSE TO FURFURAL, MAINTAINING THE CONCENTRATION OF FURFURAL IN THE CONVERSION BELOW 0.7 PERCENT BY CONTINUOUSLY REMOVING AQUEOUS XYLOSE-ACID SOLUTION FROM THE CONVERSION, COOLING THE REMOVED SOLUTION BELOW ABOUT 50* C., EXTRACTING THE COOLED SOLUTION COUNTERCURRENTLY WITH TOLUENE TO REMOVE FURFURAL, REMOVING THE TOLUENEFURFURAL SOLUTION, RE-HEATING THE EFFLUENT XYLOSEACID SOLUTION AND RECYCLING IT TO THE XYLOSE CONVERSION HEATING STEP.
Claim 2
Dependent Claim
97 words
A PROCESS FOR THE PRODUCTION OF FURFURAL WHICH COMPRISES HEATING A SOLUTION CONTAINING 1 1/2 TO 10 PERCENT XYLOSE AND 1 1/2 TO 5 PERCENT SULFURIC ACID TO A TEMPERATURE OF 140* TO 165* C. TO CONVERT THE XYLOSE TO FURFURAL, MAINTAINING THE CONCENTRATION OF FURFURAL IN THE CONVERSION BELOW 0.7 PERCENT BY CONTINUOUSLY REMOVING AQUEOUS XYLOSE-ACID SOLUTION FROM THE CONVERSION, COOLING THE REMOVED SOLUTION BELOW ABOUT 50* C., EXTRACTING THE COOLED SOLUTION COUNTERCURRENTLY WITH TOLUENE TO REMOVE FURFURAL, REMOVING THE TOLUENEFURFURAL SOLUTION, RE-HEATING THE EFFLUENT XYLOSEACID SOLUTION AND RECYCLING IT TO THE XYLOSE CONVERSION HEATING 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) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |