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US4368105A
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Electrolytic solution for Karl Fischer coulometric titration
Assignee: Mitsubishi Chemical Corp
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Filing: 1981-01-21
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Granted: 1983-01-11
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Expires: 2001-01-21
Abstract
Abstract There is disclosed an electrolytic solution for Karl Fischer method comprising chloroform and an alkylene carbonate as solvent and iodine or an iodide, sulfur dioxide, pyridine and a small amount of an alcohol. The solution is suitable for use in determination of water by Karl Fischer titration method as a generating medium.
Inventors
- 👤 Kaname Muroi
- 👤 Hiroko Fujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:02
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/16; G01N31/168
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
39 words
An electrolytic solution for Karl Fischer coulometric titration the major proportion being comprised of chloroform and an alkylene carbonate, as solvent, and the remainder being iodine or an iodide, sulfur dioxide, pyridine and a small amount of an alcohol.
Claim 2
Dependent Claim
39 words
An electrolytic solution for Karl Fischer coulometric titration the major proportion being comprised of chloroform and an alkylene carbonate, as solvent, and the remainder being iodine or an iodide, sulfur dioxide, pyridine and a small amount of an alcohol.
Claim 3
Dependent Claim
29 words
An electrolytic solution in accordance with claim 1, wherein the proportion by weight of said alkylene carbonate to said chloroform is within a range of from 1:20 to 1:2.
Claim 4
Dependent Claim
22 words
An electrolytic solution in accordance with claims 1 or 2, wherein the content of said pyridine is 10 to 15% by weight.
Claim 5
Dependent Claim
23 words
An electrolytic solution in accordance with claims 1 or 2, wherein the content of said sulfur dioxide is 2.5 to 7.5% by weight.
Claim 6
Dependent Claim
30 words
An electrolytic solution in accordance with claims 1, or 2, wherein the content of said iodine or iodide is 0.9 to 1.4% by weight, in terms of I 2 .
Claim 7
Dependent Claim
21 words
An electrolytic solution in accordance with claims 1, 2, wherein the content of said alcohol is up to 0.7% by weight.
Claim 8
Dependent Claim
15 words
An electrolytic solution in accordance with claims 1, wherein said alkylene carbonate is propylene carbonate.
Claim 9
Dependent Claim
24 words
An electrolytic solution in accordance with claim 7 wherein the proportion by weight of said propylene carbonate to said chloroform is 1:12 to 1:5.
Claim 10
Dependent Claim
15 words
An electrolytic solution in accordance with claim 2 wherein said alkylene carbonate is propylene carbonate.
References Cited (Backward Citations)
US3749659A
Cited
US4049503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |