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Patent US4349669A successfully refreshed from Google Patents.
US4349669A
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US
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Purification of alkylglycosides by distillative removal of unconverted alcohols
Assignee: BASF SE
•
Filing: 1981-01-05
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Granted: 1982-09-14
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Expires: 2001-01-05
Abstract
Abstract A process for purifying C 8 -C 16 -alkylglycosides which have been obtained by reacting lower alkylglycosides or hydroxyalkylglycosides with C 8 -C 16 -alcohols in the presence of an acid catalyst, by distillative removal of unconverted C 8 -C 16 -alcohols, wherein the distillative removal, at least of the last amounts of unconverted alcohols, is carried out in the presence of glycols whose boiling points are at most 10° above, and at most 30° below, those of the alcohols to be removed.
Inventors
- 👤 Erhard Klahr
- 👤 Wolfgang Trieselt
- 👤 Horst Trapp
- 👤 Rudi Widder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:59
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/02; C07H15/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
In a process for purifying C 8 -C 16 -alkylglycosides which have been obtained by reacting lower alkylglycosides or hydroxyalkylglycosides with C 8 -C 16 -alcohols in the presence of an acid catalyst, by distillative removal of unconverted C 8 -C 16 -alcohols, the improvement that the distillative removal, at least of the last amounts of unconverted alcohols, is carried out in the presence of glycols which are added after substantial termination of the reaction whose boiling points are not more than 10° above, and not more than 30° below, those of the alcohols to be removed.
Claim 2
Dependent Claim
97 words
In a process for purifying C 8 -C 16 -alkylglycosides which have been obtained by reacting lower alkylglycosides or hydroxyalkylglycosides with C 8 -C 16 -alcohols in the presence of an acid catalyst, by distillative removal of unconverted C 8 -C 16 -alcohols, the improvement that the distillative removal, at least of the last amounts of unconverted alcohols, is carried out in the presence of glycols which are added after substantial termination of the reaction whose boiling points are not more than 10° above, and not more than 30° below, those of the alcohols to be removed.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said glycols are added at the start of distillative removal.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein said glycols are added to remove the last amounts of uncoverted alcohols.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein dipropylene glycol is added to effect the distillative removal.
References Cited (Backward Citations)
US2407002A
Cited
GB1072655A
Cited
US3378542A
Cited
US3375243A
Cited
DE1905523A1
Cited
DE2036472A1
Cited
US3772269A
Cited
US4137396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |