US4063891A
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Method for determining the inorganic carbon content of aqueous liquids
Assignee: Bayer AG
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Filing: 1976-07-16
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Granted: 1977-12-20
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Expires: 1996-07-16
Abstract
Abstract In a method for determining the inorganic carbon content of aqueous liquids, the liquid sample together with a carbon dioxide free carrier gas is injected vertically from top to bottom in to a heated reaction chamber. The reaction chamber is filled with liquid phosphoric acid. The carbon dioxide generated in the reaction of the sample with the phosphoric acid is fed to a CO 2 analyser. The reaction chamber is preferably heated to a temperature of approximately 140° C.
Inventors
- 👤 Wolf-Jurgen Becker
- 👤 Alois Ruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:49
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/182; Y; Y10; Y10T; Y10T436/00; Y10T436/23; Y10T436/235
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A method for determining the inorganic carbon content of aqueous liquids, wherein a liquid sample to be analysed is injected vertically downwards into a reaction chamber containing liquid phosphoric acid, into which is also fed a carbon dioxide-free carrier gas, the sample reacting with the phosphoric acid to form carbon dioxide and water and the carbon dioxide generated is fed to a carbon dioxide analyser.
Claim 2
Independent Claim
65 words
A method for determining the inorganic carbon content of aqueous liquids, wherein a liquid sample to be analysed is injected vertically downwards into a reaction chamber containing liquid phosphoric acid, into which is also fed a carbon dioxide-free carrier gas, the sample reacting with the phosphoric acid to form carbon dioxide and water and the carbon dioxide generated is fed to a carbon dioxide analyser.
Claim 3
Dependent Claim
29 words
A method as claimed in Claim 1, wherein the phosphoric acid is pure 85% phosphoric acid and a temperature of approximately 140° C is maintained in the reaction chamber.
Claim 4
Dependent Claim
14 words
A method as claimed in Claim 1, wherein the phosphoric acid is renewed continuously.
Claim 5
Dependent Claim
15 words
A method as claimed in Claim 1, wherein the phosphoric acid is periodically entirely replaced.
Claim 6
Dependent Claim
17 words
A method as claimed in Claim 1, wherein a portion of the phosphoric acid is periodically replaced.
Claim 7
Dependent Claim
29 words
A method as claimed in claim 1, wherein the carrier gas is heated to the temperature prevailing in the reaction chamber before it is fed into the reaction chamber.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 2, wherein the carrier gas is heated to the temperature prevailing in the reaction chamber before it is fed into the reaction chamber.
References Cited (Backward Citations)
US3672841A
Cited
US3840341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |