US4371616A
Expired / Lapsed
US
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Process for producing L-sugars
Assignee: IFP Energies nouvelles
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Filing: 1981-08-26
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Granted: 1983-02-01
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Expires: 2001-08-26
Abstract
Abstract A method for producing L-sugars including L-idose and L-gulose from D-glucose. The method comprises hydrogenating D-glucose to provide sorbitol, oxydizing the D-sorbitol to provide L-sorbose, racemizing the L-sorbose to provide a mixture of L-sorbose, L-idose and L-gulose, and precipitating the L-sorbose with lime from a dilute solution. The unconverted L-sorbose is recovered by carbonation and recycled. The hydrogenation of glucose is done in a fixed catalyst bed.
Inventors
- 👤 Derk T. A. Huibers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:23
CPC Classifications
C; C07; C07H; C07H3/00; C07H3/02; C07C; C07C31/00; C07C31/18; C07C31/26
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
56 words
A method of producing L-sugars including L-idose and L-gulose from D-glucose, which comprises the steps of: (a) hydrogenating D-glucose to provide D-sorbitol; (b) oxidizing said D-sorbitol to provide L-sorbose; (c) racemizing said L-sorbose to provide a mixture of L-sorbose, L-idose and L-gulose; and (d) precipitating the unracemized L-sorbose under cooling with lime from a dilute solution.
Claim 2
Independent Claim
56 words
A method of producing L-sugars including L-idose and L-gulose from D-glucose, which comprises the steps of: (a) hydrogenating D-glucose to provide D-sorbitol; (b) oxidizing said D-sorbitol to provide L-sorbose; (c) racemizing said L-sorbose to provide a mixture of L-sorbose, L-idose and L-gulose; and (d) precipitating the unracemized L-sorbose under cooling with lime from a dilute solution.
Claim 3
Dependent Claim
12 words
The method according to claim 1, wherein the unracemized L-sorbose is recycled.
Claim 4
Dependent Claim
29 words
The method according to claim 1, wherein said hydrogenation of D-glucose the ratio of hydrogen gas to liquid feed rate of said D-glucose ranges from about 500 to 5000.
Claim 5
Dependent Claim
17 words
The method according to claim 1, wherein said D-glucose is in a 5 to 60% aqueous solution.
Claim 6
Dependent Claim
17 words
The method according to claim 1, wherein said D-glucose is in a 10 to 40% aqueous solution.
Claim 7
Dependent Claim
27 words
The method according to claim 1, wherein said D-glucose is hydrogenated in a fixed catalyst bed at a temperature ranging from about 100° to about 150° C.
Claim 8
Dependent Claim
21 words
The method according to claim 1, wherein said L-sorbose is racemized at a temperature ranging from about 20° to 80° C.
Claim 9
Dependent Claim
24 words
The method according to claim 1, wherein said L-sorbose is racemized to a mixture of L-sorbose, L-idose and L-gulose in a 1.0N alkaline solution.
Claim 10
Dependent Claim
20 words
The method according to claim 1, wherein said L-sorbose is precipitating with lime from a 6 to 7% aqueous solution.
Claim 11
Dependent Claim
22 words
The method according to claim 1, wherein L-idose and L-gulose are recovered by crystallization from a solution after removal of calcium L-sorbate.
Claim 12
Dependent Claim
27 words
The method according to claim 1, wherein the oxidation of D-sorbitol to L-sorbose is carried out with an oxygen containing gas in the presence of Gluconobacter suboxydans.
Claim 13
Independent Claim
49 words
A method of producing L-sugars including L-idose and L-gulose from D-sorbitol which comprises the steps of: (a) oxidizing D-sorbitol to provide L-sorbose; (b) racemizing said L-sorbose to provide a mixture of L-sorbose, L-idose and L-gulose; and (c) precipitating the unracemized L-sorbose under cooling with lime from a dilute solution.
Claim 14
Independent Claim
49 words
A method of producing L-sugars including L-idose and L-gulose from D-sorbitol which comprises the steps of: (a) oxidizing D-sorbitol to provide L-sorbose; (b) racemizing said L-sorbose to provide a mixture of L-sorbose, L-idose and L-gulose; and (c) precipitating the unracemized L-sorbose under cooling with lime from a dilute solution.
Claim 15
Dependent Claim
12 words
The method according to claim 12, wherein the unracemized L-sorbose is recycled.
Claim 16
Dependent Claim
24 words
The method according to claim 12, wherein said L-sorbose is racemized to a mixture of L-sorbose, L-idose and L-gulose in a 1.0N alkaline solution.
Claim 17
Dependent Claim
20 words
The method according to claim 12, wherein said L-sorbose is precipitated with lime from a 6 to 7% aqueous solution.
Claim 18
Dependent Claim
22 words
The method according to claim 13, wherein L-idose and L-gulose are recovered by crystallization from a solution after removal of calcium L-sorbate.
Claim 19
Dependent Claim
22 words
The method according to claim 12, wherein said L-sorbose is racemized at a temperature ranging from about 20° to about 80° C.
Claim 20
Independent Claim
42 words
A method of producing L-sugars including L-idose and L-gulose from L-sorbose which comprises the steps of: (a) racemizing L-sorbose to provide a mixture of L-sorbose L-idose and L-gulose; and (b) precipitating the unracemized L-sorbose under cooling with lime from a dilute solution.
Claim 21
Independent Claim
42 words
A method of producing L-sugars including L-idose and L-gulose from L-sorbose which comprises the steps of: (a) racemizing L-sorbose to provide a mixture of L-sorbose L-idose and L-gulose; and (b) precipitating the unracemized L-sorbose under cooling with lime from a dilute solution.
Claim 22
Dependent Claim
12 words
The method according to claim 18, wherein the unracemized L-sorbose is recycled.
Claim 23
Dependent Claim
25 words
The method according to claim 18, wherein said L-sorbose is racemized to a mixture of L-sorbose, L-idose and L-gulose, in a 1.0 N alkaline solution.
Claim 24
Dependent Claim
20 words
The method according to claim 18, wherein said L-sorbose is precipitated with lime from a 6 to 7% aqueous solution.
Claim 25
Dependent Claim
22 words
The method according to claim 18, wherein L-idose and L-gulose are recovered by crystallization from a solution after removal of clacium L-sorbate.
Claim 26
Dependent Claim
22 words
The method according to claim 18, wherein said L-sorbose is racemixed at a temperature ranging from about 20° to about 80° C.
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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |