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US4465828A
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Process of preparing alkylsaccharides
Assignee: Procter and Gamble Co
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Filing: 1984-02-17
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Granted: 1984-08-14
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Expires: 2004-02-17
Abstract
Abstract Hydroxy carboxylic acids minimize the formation of color bodies in processes for preparing and purifying alkylsaccharides when the temperature exceeds about 100 DEG C.
Inventors
- 👤 Allen H. Rau
- 👤 Donald T. Speckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:09
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/02; C07H15/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
74 words
In the process for producing an alkylsaccharide by reacting an alcohol with a reducing sugar containing from 5 to 6 carbon atoms, or source thereof, in the presence of a strong acid catalyst, the improvement of incorporating in the reaction mixture from about 0.0015 to about 1% of hydroxy polycarboxylic acid, selected from the group consisting of citric acid, maleic acid, tartaric acid, salts of said acids, hydrates of said acids, and mixtures thereof.
Claim 2
Dependent Claim
74 words
In the process for producing an alkylsaccharide by reacting an alcohol with a reducing sugar containing from 5 to 6 carbon atoms, or source thereof, in the presence of a strong acid catalyst, the improvement of incorporating in the reaction mixture from about 0.0015 to about 1% of hydroxy polycarboxylic acid, selected from the group consisting of citric acid, maleic acid, tartaric acid, salts of said acids, hydrates of said acids, and mixtures thereof.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said hydroxypolycarboxylic acid is present in the form of a hydrate initially.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said hydroxypolycarboxylic acid is citric acid.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein said citric acid is present initially as a hydrate.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said hydroxypolycarboxylic acid is maleic acid.
Claim 7
Dependent Claim
15 words
The process of claim 5 wherein said maleic acid is present initially as a hydrate.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said hydroxypolycarboxylic acid is tartaric acid.
Claim 9
Dependent Claim
15 words
The process of claim 7 wherein said tartaric acid is present initially as a hydrate.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein said hydroxypolycarboxylic acid is present at a level of from about 0.0075% to about 0.1%.
Claim 11
Dependent Claim
21 words
The process of claim 9 wherein said hydroxypolycarboxylic acid is present at a level of from about 0.02% to about 0.05%.
Claim 12
Dependent Claim
12 words
The process of claim 9 wherein said hydroxypolycarboxylic acid is citric acid.
Claim 13
Dependent Claim
15 words
The process of claim 11 wherein said citric acid is present initially as a hydrate.
Claim 14
Dependent Claim
66 words
In the process of heating an alkylsaccharide to a temperature above 120° C. to about 165° C. wherein the saccharide portion of said alkylsaccharide is derived from a reducing sugar containing five or six carbon atoms, the improvement of incorporating from about 0.003 to about 2% of a hydroxy polycarboxylic acid selected from the group consisting of citric acid, tartaric acid, maleic acid, and mixtures thereof.
Claim 15
Dependent Claim
66 words
In the process of heating an alkylsaccharide to a temperature above 120° C. to about 165° C. wherein the saccharide portion of said alkylsaccharide is derived from a reducing sugar containing five or six carbon atoms, the improvement of incorporating from about 0.003 to about 2% of a hydroxy polycarboxylic acid selected from the group consisting of citric acid, tartaric acid, maleic acid, and mixtures thereof.
Claim 16
Dependent Claim
23 words
The process of claim 13 wherein the mixture of the alkylsaccharide and hydroxypolycarboxylic acid has a pH from about 3 to about 10.
Claim 17
Dependent Claim
15 words
The process of claim 14 wherein said pH is from about 5 to about 7.
Claim 18
Dependent Claim
24 words
The process of claim 15 wherein the pH of the mixture of said alkylsaccharide and said hydroxypolycarboxylic is from about 5 to about 7.
Claim 19
Dependent Claim
12 words
The process of claim 13 wherein said hydroxypolycarboxylic acid is citric acid.
Claim 20
Dependent Claim
12 words
The process of claim 13 wherein said hydroxypolycarboxylic acid is tartaric acid.
Claim 21
Dependent Claim
12 words
The process of claim 13 wherein said hydroxypolycarboxylic acid is maleic acid.
References Cited (Backward Citations)
US3766165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |