US4510306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for purifying reaction products containing higher-alkyl glycosides
Assignee: BASF Corp
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Filing: 1983-09-13
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Granted: 1985-04-09
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Expires: 2003-09-13
Abstract
Abstract The subject invention relates to the removal of residual higher alcohols which are present from the preparation of crude higher-alkyl glycosides. The residual higher alcohols are removed via vacuum distillation with a hydroxyl-containing solvent. The purified higher-alkyl glycosides are biodegradable nonionic surfactants which are soluble and stable in highly alkaline cleaning formulations used for bottle washing, metal cleaning, textile treatment and other applications.
Inventors
- 👤 William K. Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:18
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/02; C07H15/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
147 words
A process for purifying crude higher-alkyl glycosides containing residual free higher alcohols, said glycosides obtained by the acid catalyzed reaction of C 8 -C 18 aliphatic monohydric alcohols with a source of monosaccharide, which comprises partially distilling a mixture of the crude higher-alkyl glycoside and a hydroxyl containing solvent selected from the group consisting of: (a) glycerol, (b) polyoxyalkylene glycols having an average of 3 to about 5 oxyalkylene units selected from oxyethylene and oxypropylene, (c) C 1 -C 4 alkyl ethers of polyoxyalkylene glycols having about 2 to about 5 oxyalkylene units selected from oxyethylene and oxypropylene, and (d) C 1 -C 4 alkyl ethers of aliphatic diols, triols, and tetrols having no more than 4 carbon atoms, wherein further, the boiling point of the solvent is at least 10° C. higher than that of the higher alcohol used in the preparation of the higher-alkyl glycoside.
Claim 2
Dependent Claim
147 words
A process for purifying crude higher-alkyl glycosides containing residual free higher alcohols, said glycosides obtained by the acid catalyzed reaction of C 8 -C 18 aliphatic monohydric alcohols with a source of monosaccharide, which comprises partially distilling a mixture of the crude higher-alkyl glycoside and a hydroxyl containing solvent selected from the group consisting of: (a) glycerol, (b) polyoxyalkylene glycols having an average of 3 to about 5 oxyalkylene units selected from oxyethylene and oxypropylene, (c) C 1 -C 4 alkyl ethers of polyoxyalkylene glycols having about 2 to about 5 oxyalkylene units selected from oxyethylene and oxypropylene, and (d) C 1 -C 4 alkyl ethers of aliphatic diols, triols, and tetrols having no more than 4 carbon atoms, wherein further, the boiling point of the solvent is at least 10° C. higher than that of the higher alcohol used in the preparation of the higher-alkyl glycoside.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the amount of the hydroxyl-containing solvent used is from 5 percent to about 20 percent by weight based upon the weight of the higher-alkyl glycoside.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |