Patent US4222957A successfully refreshed from Google Patents.
US4222957A
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Process of purifying ether sulfonates
Assignee: Huntsman Corp
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Filing: 1978-11-24
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Granted: 1980-09-16
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Expires: 1998-11-24
Abstract
Abstract Covers a method of purifying ether sulfonates by contact with ethylene oxide or propylene oxide.
Inventors
- 👤 Lewis W. Watts, Jr.
- 👤 Walter H. Brader, Jr.
- 👤 Philip H. Moss
- 👤 Ernest L. Yeakey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:48
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A method of purifying aqueous solutions of ether sulfonates which contain at least bisulfite impurity, said ether sulfonates having the following structural formula: ##STR6## where R is a radical selected from the group consisting of C 1 -C 30 alkyl, C 2 -C 30 alkenyl, C 1 -C 30 substituted alkyl, C 2 -C 30 substituted alkenyl, alkaryl containing one or more C 1 -C 18 alkyl groups substituted on said aryl group and aralkyl containing 7-28 carbon atoms, R 1 is H or CH 3 , z is an integer of 1-40 and A is an alkali metal cation, which comprises the steps of contacting said aqueous solution with ethylene oxide or propylene oxide at a temperature ranging from about room temperature up to about 250° C. for a time ranging from about 1/4 to about 24 hours and separating out a resultant top aqueous layer of purified ether sulfonate from a bottom aqueous layer containing said impurity.
Claim 2
Independent Claim
159 words
A method of purifying aqueous solutions of ether sulfonates which contain at least bisulfite impurity, said ether sulfonates having the following structural formula: ##STR6## where R is a radical selected from the group consisting of C 1 -C 30 alkyl, C 2 -C 30 alkenyl, C 1 -C 30 substituted alkyl, C 2 -C 30 substituted alkenyl, alkaryl containing one or more C 1 -C 18 alkyl groups substituted on said aryl group and aralkyl containing 7-28 carbon atoms, R 1 is H or CH 3 , z is an integer of 1-40 and A is an alkali metal cation, which comprises the steps of contacting said aqueous solution with ethylene oxide or propylene oxide at a temperature ranging from about room temperature up to about 250° C. for a time ranging from about 1/4 to about 24 hours and separating out a resultant top aqueous layer of purified ether sulfonate from a bottom aqueous layer containing said impurity.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said aqueous solution is a mixture of water and alcohol.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein said alcohol is a lower alkyl alcohol.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein said lower alkyl alcohol is isopropyl alcohol.
Claim 6
Dependent Claim
10 words
The method of claim 1 wherein R 1 is H.
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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |