US4411815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing odorless alkyl ether sulfate concentrates
Assignee: Lion Corp
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Filing: 1981-06-24
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Granted: 1983-10-25
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Expires: 2001-06-24
Abstract
Abstract An odorless polyoxyethylene alkyl ether sulfate concentrate having a concentration of about 85 wt. % or more can be obtained by treating a polyoxyethylene alkyl ether sulfate aqueous solution having a concentration of about 60-80 wt. % under reduced pressure and at a temperature of 50°-130° C.
Inventors
- 👤 Hideo Ando
- 👤 Akira Hayashi
- 👤 Kyozo Kitano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:58
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/05
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
167 words
A process for deodorizing a polyoxyethylene alkyl ether sulfate aqueous concentrate, said aqueous concentrate containing from 60 to 80 wt.% of polyoxyethylene alkyl ether sulfate having the formula RO(CH 2 CH 2 O) n SO 3 M, wherein R is alkyl having 8 to 18 carbon atoms, n is a number from 2 to 10 and M is a cation providing a water-soluble salt, the balance of said aqueous concentrate consisting essentially of water and the odorous components of unreacted alcohol and cyclic ether by-produced in the sulfation reaction for forming said polyoxyethylene alkyl ether sulfate, said process consisting essentially of the step of: subjecting said aqueous concentrate to a pressure in the range of from 50 to 400 mmHg, at a temperature of from 50° to 130° C., effective to evaporate said odorous components (and some of the water) from said aqueous concentrate, the treatment being carried out for a short period of time effective to prevent hydrolysis and coloration of said polyoxyethylene alkyl ether sulfate.
Claim 2
Dependent Claim
167 words
A process for deodorizing a polyoxyethylene alkyl ether sulfate aqueous concentrate, said aqueous concentrate containing from 60 to 80 wt.% of polyoxyethylene alkyl ether sulfate having the formula RO(CH 2 CH 2 O) n SO 3 M, wherein R is alkyl having 8 to 18 carbon atoms, n is a number from 2 to 10 and M is a cation providing a water-soluble salt, the balance of said aqueous concentrate consisting essentially of water and the odorous components of unreacted alcohol and cyclic ether by-produced in the sulfation reaction for forming said polyoxyethylene alkyl ether sulfate, said process consisting essentially of the step of: subjecting said aqueous concentrate to a pressure in the range of from 50 to 400 mmHg, at a temperature of from 50° to 130° C., effective to evaporate said odorous components (and some of the water) from said aqueous concentrate, the treatment being carried out for a short period of time effective to prevent hydrolysis and coloration of said polyoxyethylene alkyl ether sulfate.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1 wherein said pressure is from 50 to 200 mmHg.
Claim 4
Dependent Claim
16 words
A process as claimed in claim 1 wherein said temperature is from 70° to 120° C.
Claim 5
Dependent Claim
31 words
A process as claimed in claim 1 wherein said composition is a reversed micelle where said polyoxyethylene alkyl ether sulfate forms a continuous phase and said water forms a dispersed phase.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 1 wherein the concentration of said polyoxyethylene alkyl ether sulfate in said aqueous concentrate is increased by at least 5 wt.%.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 1 wherein the concentration of said polyoxyethylene alkyl ether sulfate in said aqueous concentrate is increased to approximately 80 to 90 wt.%.
Claim 8
Dependent Claim
23 words
A process as claimed in claim 1 wherein M is selected from the group consisting of sodium, potassium, magnesium, monoethanolamine, diethanolamine and triethanolamine.
Claim 9
Dependent Claim
35 words
A process as claimed in claim 1 wherein said aqueous concentrate is flowed in the form of a thin film on a thin film evaporator while it is subjected to said temperature and said pressure.
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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |