Patent US4246091A successfully refreshed from Google Patents.
US4246091A
Expired / Lapsed
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Process for the electrolytic treatment of alkali halide
Assignee: Kureha Corp
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Filing: 1978-03-06
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Granted: 1981-01-20
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Expires: 1998-03-06
Abstract
Abstract A process for the electronic treatment of alkali halide. Use is made of a cation exchange membrane having as its ion exchange radicals, sulfonic acid radicals. This membrane is treated with primary to tertiary monoamine or its salt or quatary ammonium salt and then heat-treated at a temperature higher than 100° C. and lower than melting point of the reaction product and then subjected to drying, so as to improving the cation-selecting performance of the membrane and to increase its current efficiency.
Inventors
- 👤 Naohiro Murayama
- 👤 Makoto Fukuda
- 👤 Sirou Sujuki
- 👤 Teruo Sakagami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:58
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J5/2293; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A process for the manufacture of cationic exchange membranes which employ sulfonic acid moieties as ion exchange radicals, comprising: (a) treating a fluorocarbon resin membrane with an ammonium salt of the formula NR.sub.1 R.sub.2 R.sub.3 R.sub.4 X wherein R 1 is alkyl, aryl, aralkyl, or a halogen derivative of any one thereof; R 2 , R 3 , and R 4 are the same or different and are hydrogen, or alkyl, aryl, aralkyl, or a halogen derivative of any one thereof; and X is F, Cl, Br, I, OH, No 3 , a carboxylic acid radical, or an inorganic acid radical; and (b) heating the treated membrane to a temperature of from about 150° to about 200° C.
Claim 2
Dependent Claim
118 words
A process for the manufacture of cationic exchange membranes which employ sulfonic acid moieties as ion exchange radicals, comprising: (a) treating a fluorocarbon resin membrane with an ammonium salt of the formula NR.sub.1 R.sub.2 R.sub.3 R.sub.4 X wherein R 1 is alkyl, aryl, aralkyl, or a halogen derivative of any one thereof; R 2 , R 3 , and R 4 are the same or different and are hydrogen, or alkyl, aryl, aralkyl, or a halogen derivative of any one thereof; and X is F, Cl, Br, I, OH, No 3 , a carboxylic acid radical, or an inorganic acid radical; and (b) heating the treated membrane to a temperature of from about 150° to about 200° C.
Claim 3
Dependent Claim
47 words
The process of claim 1, wherein the treating accomplished by dipping the membrane in a solution of the ammonium salt for a period of from about 2 hours up to one week, at a temperature between room temperature and the boiling point of the ammonium salt solution.
Claim 4
Dependent Claim
32 words
The process of claim 2, wherein the heating is for a period of from several minutes up to about 24 hours and the temperature is from about 140° to about 230° C.
Claim 5
Dependent Claim
29 words
The process of claim 2, wherein the amine salt is selected from the group consisting of: trimethylamine hydrochloride; tributylamine hydrochloride; isopropylamine hydrochloride; dimethylamine hydrochloride; tetramethylamine hydrochloride; and trimethylbenzylammonium chloride.
Claim 6
Dependent Claim
12 words
The process of claim 2, wherein the amine salt is trimethylamine hydrochloride.
Claim 7
Dependent Claim
24 words
The process of claim 1, wherein the membrane is further subjected to immersion in boiling water for from about 30 to about 60 minutes.
Claim 8
Dependent Claim
21 words
The process of claim 1, wherein the heating is for a period of from several minutes up to about 24 hours.
Claim 9
Dependent Claim
18 words
The process of claim 1, wherein only one side of the membrane is coated with the amine salt.
Claim 10
Dependent Claim
19 words
The process of claim 1, wherein the alkyl, aryl and aralkyl moieties have not more than eight carbon atoms.
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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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |