US5079350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of alkyl glycoside or aqueous solution thereof
Assignee: Kao Corp
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Filing: 1990-03-29
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Granted: 1992-01-07
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Expires: 2010-03-29
Abstract
Abstract A process for the production of an alkyl glycoside or an aqueous solution thereof is disclosed, comprising the steps of (1) reacting a sugar with alcohol to obtain an alkyl glycoside reaction product containing unreacted alcohol, (2) establishing a moving liquid film of the alkyl glycoside reaction product and (3) contacting the moving liquid film with steam or an inert gas at a temperature of from 50° to 200° C. The alkyl glycoside or aqueous solution thus obtained contains little unreacted alcohol and is excellent in hue and odor.
Inventors
- 👤 Tadaaki Fujita
- 👤 Kiyoshi Aimono
- 👤 Kunizo Hashiba
- 👤 Koichi Ohori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:34
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/02; C07H15/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
A process for the production of an alkyl glycoside or aqueous solution thereof, comprising the steps of (1) reacting a sugar with alcohol to obtain an alkyl glycoside reaction product containing unreacted alcohol, (2) establishing a moving liquid film of the alkyl glycoside reaction product, and (3) contacting the moving liquid film with steam or an inert gas at a temperature of from 50 to 200° C. to remove the unreacted alcohol.
Claim 2
Dependent Claim
72 words
A process for the production of an alkyl glycoside or aqueous solution thereof, comprising the steps of (1) reacting a sugar with alcohol to obtain an alkyl glycoside reaction product containing unreacted alcohol, (2) establishing a moving liquid film of the alkyl glycoside reaction product, and (3) contacting the moving liquid film with steam or an inert gas at a temperature of from 50 to 200° C. to remove the unreacted alcohol.
Claim 3
Dependent Claim
78 words
A process as in claim 1, wherein the alkyl glycoside reaction product is obtained by reacting the sugar with a higher alcohol represented by formula (I): R.sup.1 (OR.sup.2).sub.x OH (I) wherein R 1 represents a straight-chain or branched alkyl, alkenyl or alkylphenyl group having from 6 to 22 carbon atoms; R 2 represents an alkylene group having from 2 to 4 carbon atom; and x indicates a mean value and is a number equal to 0 to 5.
Claim 4
Dependent Claim
96 words
A process as in claim 1, whrein the alkyl glycoside reaction product is obtained by: first reacting the sugar with a lower alcohol selected from methanol, ethanol, propanol and butanol; and then reacting the product thereof with a higher alcohol represented by formula (I): R.sup.1 (OR.sup.2).sub.x OH (I) wherein R 1 represents a straight-chain or branched alkyl, alkenyl or alkylphenyl group having from 6 to 22 carbon atoms; R 2 represents an alkylene group having from 2 to 4 carbon atoms; and x indicates a mean value and is a number equal to 0 to 5.
Claim 5
Dependent Claim
38 words
A process as in claim 1, wherein the unreacted alcohol content of the thus produced alkyl glycoside or aqueous solution thereof is reduced to an amount of 0.5 % by weight or less based on the alkyl glycoside.
Claim 6
Dependent Claim
38 words
A process as in claim 1, wherein the unreacted alcohol content of the thus produced alkyl glycoside or aqueous solution thereof is reduced to an amount of 0.2 % by weight or less based on the alkyl glycoside.
Claim 7
Dependent Claim
27 words
A process as in claim 1, wherein the concentration of the unreacted alcohol in the alkyl glycoside reaction product is from 3 to 10 % by weight.
Claim 8
Dependent Claim
28 words
A process as in claim 1, wherein the moving liquid film is contacted with steam or an inert gas at a temperature of from 120° to 170° C.
Claim 9
Dependent Claim
27 words
A process as in claim 1, wherein the moving liquid film is contacted with steam or an inert gas at a pressure of 300 mmHg or less.
Claim 10
Dependent Claim
27 words
A process as in claim 1, wherein the moving liquid film is contacted with steam or an inert gas at a pressure of 150 mmHg or less.
Claim 11
Dependent Claim
20 words
A process as in claim 1, wherein the moving liquid film has a thickness of about 10 mm or less.
References Cited (Backward Citations)
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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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |