US4845208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the oxidation of aldoses, catalyst used in said process and products thus obtained
Assignee: GKN Driveline International GmbH
•
Filing: 1987-01-28
•
Granted: 1989-07-04
•
Expires: 2007-01-28
Abstract
Abstract Process for the oxidation of aldoses and particularly of glucose into the corresponding aldonic acids, wherein oxidation is carried out in an alkaline medium by means of an oxygen-containing gas, in the presence of a catalyst obtained by adding an efficient quantity of at least one of the metals constituting the Groups IV, V and VI, or promoter, onto a catalyst consisting of palladium on an inert support.
Inventors
- 👤 Patrick Fuertes
- 👤 Guy Fleche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:45
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/23; C07C51/235; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
84 words
In a process for the oxidation of an aldose into the corresponding aldonic acid with an oxygen-containing gas in an aqueous alkaline reaction medium in the presence of a promoted palladium-based catalyst which has been prepared by depositing on an inert support a palladium compound, then adding a promoter compound selected from the group consisting of the metals of groups IV, V and VI of the periodic system, reducing the promoted palladium-based compound and using the thus obtained catalyst as such in said oxidation.
Claim 2
Dependent Claim
84 words
In a process for the oxidation of an aldose into the corresponding aldonic acid with an oxygen-containing gas in an aqueous alkaline reaction medium in the presence of a promoted palladium-based catalyst which has been prepared by depositing on an inert support a palladium compound, then adding a promoter compound selected from the group consisting of the metals of groups IV, V and VI of the periodic system, reducing the promoted palladium-based compound and using the thus obtained catalyst as such in said oxidation.
Claim 3
Dependent Claim
10 words
Process according to claim 2, wherein the aldose is glucose.
Claim 4
Dependent Claim
21 words
Process according to claim 1, wherein the promoter is selected from the group consisting of bismuth, lead, antimony, tin or selenium.
Claim 5
Dependent Claim
27 words
Process according to claim 1, wherein the inert support is selected from the group consisting of finely divided carbon, alumina, silica, silica-alumina, barium sulfate and titanium oxide.
Claim 6
Dependent Claim
30 words
Process according to claim 1, wherein the palladium content of the catalyst, expressed in terms of metal, is between 1 and 10 wt % with respect to the inert support.
Claim 7
Dependent Claim
27 words
Process according to claim 1, wherein the promoter content of the catalyst, expressed in terms of metal, is between 1 and 300 % with respect to palladium.
Claim 8
Dependent Claim
28 words
Process according to claim 1, wherein the promoter content of the catalyst, expressed in terms of metal, is between 5 and 100 wt % with respect to palladium.
Claim 9
Dependent Claim
28 words
Process according to claim 1, wherein the aldose is selected from the group consisting of erythrose, threose, ribose, arabinose, xylose, lyxose, allose, altrose, gulose, mannose, idose, galactose, talose.
Claim 10
Dependent Claim
22 words
Process according to claim 1, wherein the aldose is in an aqueous solution having a concentration between 5 and 60 wt %.
Claim 11
Dependent Claim
21 words
Process according to claim 2, wherein the aldose is a glucose solution having a concentration between 20 and 40 wt %.
Claim 12
Dependent Claim
40 words
Process according to claim 1, wherein the catalyst is dispersed in the solution of aldose in a quantity such that the palladium concentration, expressed in terms of metal, is between 0.005 and 1 wt % with respect to the aldose.
Claim 13
Dependent Claim
40 words
Process according to claim 1, wherein the catalyst is dispersed in the solution of aldose in a quantity such that the palladium concentration, expressed in terms of metal, is between 0.01 and 0.4 wt % with respect to the aldose.
Claim 14
Dependent Claim
26 words
Process according to claim 1, wherein the reaction temperature ranges between 20° and 90° C. for a reaction time comprised between 30 minutes and 5 hours.
Claim 15
Dependent Claim
26 words
Process according to claim 1, wherein the reaction temperature ranges between 25° and 60° C. for a reaction time comprised between 30 minutes and 5 hours.
Claim 16
Dependent Claim
26 words
Process according to claim 1, wherein the pH of the reaction medium is maintained by means of one or several alkaline agents between 7.5 and 11.0.
Claim 17
Dependent Claim
26 words
Process according to claim 1, wherein the pH of the reaction medium is maintained by means of one or several alkaline agents between 8.0 and 10.0.
Claim 18
Dependent Claim
58 words
A process according to claim 1, wherein the reaction medium comprises an alkaline agent selected from the group consisting of calcium hydroxide, lithium hydroxide, magnesium hydroxide, zinc or manganese carbonates, or any other zinc or manganese salts for which the corresponding hydroxides are obtained in situ by adding an alkaline agent such as sodium hydroxide or potassium hydroxide.
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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |