US4040861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of refining enzymatically produced levulose syrups
Assignee: Unilever Bestfoods North America
•
Filing: 1976-09-09
•
Granted: 1977-08-09
•
Expires: 1996-09-09
Abstract
Abstract Refining process for removing impurities from enzymatically produced levulose syrups comprises treating the syrups with a strong acid cation exchange resin, a weak base anion exchange resin, and sulfonated coal which has decolorizing ability. The process yields syrups of exceptional purity and stability.
Inventors
- 👤 Raoul G. P. Walon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:24
CPC Classifications
C; C13; C13K; C13K11/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
Process for refining an enzymatically produced levulose-bearing syrup comprising subjecting said syrup to treatment with a cation exchanger and an anion exchanger for the removal of ions, and sulfonated coal for the removal of color bodies and color percursors.
Claim 2
Dependent Claim
39 words
Process for refining an enzymatically produced levulose-bearing syrup comprising subjecting said syrup to treatment with a cation exchanger and an anion exchanger for the removal of ions, and sulfonated coal for the removal of color bodies and color percursors.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the cation exchanger is of a strongly acid type and the anion exchanger is of a weakly basic type.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein the syrup is treated first with the cation exchanger, second with the sulfonated coal, and third with the anion exchanger.
Claim 5
Dependent Claim
24 words
The process of claim 3 wherein the cation exchanger is of a strongly acid type and the anion exchanger is of weakly basic type.
Claim 6
Dependent Claim
30 words
The process of claim 1 wherein the sulfonated coal has been given decolorizing ability by first treating it with a strong alkali and then treating it with a strong acid.
Claim 7
Dependent Claim
17 words
The process of claim 1 including the additional step of further decolorizing the syrup with activated carbon.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein the activated carbon decolorization is the last step of the refining process.
Claim 9
Dependent Claim
46 words
A process for refining an enzymatically produced levulose-bearing syrup comprising subjecting said syrup first to the action of a strongly acid type cation exchanger, second to the action of sulfonated coal having decolorizing ability, and third to the action of a weakly basic type anion exchanger.
Claim 10
Dependent Claim
46 words
A process for refining an enzymatically produced levulose-bearing syrup comprising subjecting said syrup first to the action of a strongly acid type cation exchanger, second to the action of sulfonated coal having decolorizing ability, and third to the action of a weakly basic type anion exchanger.
Claim 11
Dependent Claim
29 words
Process of claim 8 wherein the sulfonated coal has been given decolorizing ability by first treating it with a strong alkali and then treating it with a strong acid.
Claim 12
Dependent Claim
29 words
The process of claim 8 wherein, following the step of subjecting the syrup to treatment with the weakly basic anion exchanger the syrup is further decolorized with activated carbon.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |