Patent DE449322C successfully refreshed from Google Patents.
US3065263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of levulinic acid
Assignee: Rayonier Inc
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Filing: 1959-11-17
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Granted: 1962-11-20
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Expires: 1979-11-17
Abstract
No abstract record available.
Inventors
- 👤 Lewis J Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:18
CPC Classifications
C; C07; C07C; C07C51/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
THE PROCESS OF PRODUCING LEVULINIC ACID FROM A CARBOHYDRATE MATERIAL WHICH COMPRISES REACTING A HEXOSEYIELDING CARBOHYDRATE MATERIAL WITH AN ACID SOLUTION CONTAINING FROM 4 TO 10% BY WEIGHT OF A MINERAL ACID OF THE GROUP CONSISTING OF HYDROCHLORIC ACID AND SULFURIC ACID IN THE PRESENCE OF FROM 6 TO 10% BY WEIGHT OF LEVULINIC ACID AND WHICH IS IN THE WEIGHT PROPORTION TO THE CARBOHYDRATE MATERIAL OF BETWEEN 5 TO 1 AND 15 TO 1 AT A TEMPERATURE OF FROM 140* TO 200*C. FOR FROM 5 TO 60 MINUTES, COOLING THE REACTED MASS, AND SEPARATING THE LIQUID FROM THE SOLID RESIDUE, DIVIDING THE LIQUID CONTAINING THE CATALYST AND LEVULINIC ACID SEPARATED FROM SAID RESIDUE INTO TWO PARTS, ADDING TO ONE DIVIDED PART OF LIQUID SUCH AMOUNTS OF SAID MINERAL ACID AND WATER AS TO FORM SAID FIRST-MENTIONED ACID SOLUTION COMBINING THIS PART OF DIVIDED LIQUID AND ADDED MINERAL ACID AND WATER WITH ADDITIONAL CARBOHYDRATE MATERIAL AND SUBJECTING THE COMBINED MATERIAL TO HYDROLYSIS, AND RECOVERING LEVULINIC ACID FROM THE OTHER DIVIDED PART.
Claim 2
Dependent Claim
171 words
THE PROCESS OF PRODUCING LEVULINIC ACID FROM A CARBOHYDRATE MATERIAL WHICH COMPRISES REACTING A HEXOSEYIELDING CARBOHYDRATE MATERIAL WITH AN ACID SOLUTION CONTAINING FROM 4 TO 10% BY WEIGHT OF A MINERAL ACID OF THE GROUP CONSISTING OF HYDROCHLORIC ACID AND SULFURIC ACID IN THE PRESENCE OF FROM 6 TO 10% BY WEIGHT OF LEVULINIC ACID AND WHICH IS IN THE WEIGHT PROPORTION TO THE CARBOHYDRATE MATERIAL OF BETWEEN 5 TO 1 AND 15 TO 1 AT A TEMPERATURE OF FROM 140* TO 200*C. FOR FROM 5 TO 60 MINUTES, COOLING THE REACTED MASS, AND SEPARATING THE LIQUID FROM THE SOLID RESIDUE, DIVIDING THE LIQUID CONTAINING THE CATALYST AND LEVULINIC ACID SEPARATED FROM SAID RESIDUE INTO TWO PARTS, ADDING TO ONE DIVIDED PART OF LIQUID SUCH AMOUNTS OF SAID MINERAL ACID AND WATER AS TO FORM SAID FIRST-MENTIONED ACID SOLUTION COMBINING THIS PART OF DIVIDED LIQUID AND ADDED MINERAL ACID AND WATER WITH ADDITIONAL CARBOHYDRATE MATERIAL AND SUBJECTING THE COMBINED MATERIAL TO HYDROLYSIS, AND RECOVERING LEVULINIC ACID FROM THE OTHER DIVIDED PART.
References Cited (Backward Citations)
US2813900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |