Method for extracting d-xylose from xylan containing material
Abstract
Abstract XYLOSE IS EXTRACTED FROM XYLAN-CONTAINING PLANT MATERIAL SUCH AS BIRCH WOOD. THE PLANT MATERIAL IS PARTIALLY HYDROLYZED IN A WEAK ACID, FOR EXAMPLE BISULPHITE, SUCH THAT THE CELLULOSE CONTENT REMAINS SUBSTANTIALLY UNAFFECTED WHEREAS THE XYLAN AND AT LEAST PART OF THE LIGNIN IS DISSOLVED. AFTER NEUTRALIZING, THE HYDROLYSATE IS CONCENTRATED AND EXTRACTED BY LIQUID-LIQUID-EXTRACTION WITH A POLAR ORGANIC SOLVENT HAVING A DIELECTRIC CONSTANT OF LESS THAN 27 AT 20*C. TEMPERATURE OF THE EXTRACTION STEP IS FROM 30 TO 110*C. AND THE WATER CONTENT OF THE EXTRACTION SYSTEM IS FROM 4 TO 28% BY WEIGHT. D-XYLOSE OF HIGH PURITY IS OBTAINED BY SIMPLE CRYSTALLIZATION AFTER REMOVAL OF THE EXTRACTION SOLVENT.
Inventors
- 👤 Per Stranger-Johannessen
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |