US3854877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination tod-tc analysis method
Assignee: Dow Chemical Co
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Filing: 1972-08-07
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Granted: 1974-12-17
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Expires: 1992-08-07
Abstract
Abstract An integrated instrument and modified technique are provided for measuring the total carbon content (TC) and total oxygen demand (TOD) concurrently on samples of aqueous solutions or dispersions. Further, a method is provided for measuring the extent of other oxidation reactions such as nitrification occurring in processes such as the bio-oxidation of wastes.
Inventors
- 👤 E Csaky
- 👤 C Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:01
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/12; G01N33/00; G01N33/18; G01N33/1806; G01N33/1826; Y; Y10; Y10T; Y10T436/00; Y10T436/23; Y10T436/235
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
24 words
A PROCESS FOR SIMULTANEOUSLY MEASURING THE TOTAL OXYGEN DEMAND AND TOTAL CARBON OF AN AQUEOUS DISPERSION OF COMBUSTIBLE MATERIAL WHICH COMPRISES THE STEPS OF:
Claim 2
Dependent Claim
24 words
A PROCESS FOR SIMULTANEOUSLY MEASURING THE TOTAL OXYGEN DEMAND AND TOTAL CARBON OF AN AQUEOUS DISPERSION OF COMBUSTIBLE MATERIAL WHICH COMPRISES THE STEPS OF:
Claim 3
Dependent Claim
52 words
FLOWING A FEED GAS STREAM CONTAINING A RELATIVELY SMALL AMOUNT OF OXYGEN AT A CONSTANT RATE THROUGH A CONFINED COMBUSTION ZONE HEATED AT A COMBUSTION SUPPORTING TEMPERATURE WITHIN THE RANGE FROM ABOUT 600* TO ABOUT 1200*C. AND, WITHIN THE COMBUSTION ZONE, FLOWING THE FEED GAS STREAM THROUGH A COMBUSTION SUPPORTING CATALYST BED,
Claim 4
Dependent Claim
52 words
FLOWING A FEED GAS STREAM CONTAINING A RELATIVELY SMALL AMOUNT OF OXYGEN AT A CONSTANT RATE THROUGH A CONFINED COMBUSTION ZONE HEATED AT A COMBUSTION SUPPORTING TEMPERATURE WITHIN THE RANGE FROM ABOUT 600* TO ABOUT 1200*C. AND, WITHIN THE COMBUSTION ZONE, FLOWING THE FEED GAS STREAM THROUGH A COMBUSTION SUPPORTING CATALYST BED,
Claim 5
Dependent Claim
22 words
FLOWING THE EFFLUENT GAS FROM THE COMBUSTION ZONE INTO A CONTINUOUS ANALYZER FOR QUANTITATIVELY INDICATING THE CARBON DIOXIDE IN THE GASEOUS PRODUCT,
Claim 6
Dependent Claim
22 words
FLOWING THE EFFLUENT GAS FROM THE COMBUSTION ZONE INTO A CONTINUOUS ANALYZER FOR QUANTITATIVELY INDICATING THE CARBON DIOXIDE IN THE GASEOUS PRODUCT,
Claim 7
Dependent Claim
22 words
flowing the effluent gas from the combustion zone into a continuous analyzer for quantitatively indicating the carbon dioxide in the gaseous product,
Claim 8
Dependent Claim
22 words
flowing the effluent gas from the combustion zone into a continuous analyzer for quantitatively indicating the carbon dioxide in the gaseous product,
Claim 9
Dependent Claim
40 words
A method as in claim 1 including the additional step of calibrating each of the signals obtained from the carbon dioxide detector and oxygen detector to yield a measurement of carbon and total oxidizable material contained in the aqueous dispersion.
Claim 10
Dependent Claim
84 words
flowing the effluent gas from the combustion zone after passing through the carbon dioxide detector of step (2) above, into a continuous quantitative detector for gaseous oxygen and while continuing to flow the feed gas stream, injecting a small amount of the aqueous dispersion of a combustible material into the combustion zone upstream from the catalyst bed, whereby electrical signals correlative with the carbon content of the aqueous sample and its total oxygen demand are produced by the carbon dioxide and oxygen detectors, respectively.
Claim 11
Dependent Claim
84 words
flowing the effluent gas from the combustion zone after passing through the carbon dioxide detector of step (2) above, into a continuous quantitative detector for gaseous oxygen and while continuing to flow the feed gas stream, injecting a small amount of the aqueous dispersion of a combustible material into the combustion zone upstream from the catalyst bed, whereby electrical signals correlative with the carbon content of the aqueous sample and its total oxygen demand are produced by the carbon dioxide and oxygen detectors, respectively.
Claim 12
Dependent Claim
83 words
FLOWING THE GAS FROM THE COMBUSTION ZONE AFTER PASSING THROUGH THE CARBON DIOXIDE DETECTOR OF STEP (2) ABOVE, INTO A CONTINUOUS QUANTITATIVE DETECTOR FOR GASEOUS OXYGEN AND WHILE CONTINUING TO FLOW THE FEED GAS STREAM, INJECTING A SMALL AMOUNT OF THE AQUEOUS DISPERSION OF A COMBUSTIBLE MATERIAL INTO THE COMBUSTION ZNE UPSTREAM FROM THE CATALYST BED, WHEREBY ELECTRICAL SIGNALS CORRELATIVE WITH THE CARBON CONTENT OF THE AQUEOUS SAMPLE AND ITS TOTAL OXYGEN DEMAND ARE PRODUCED BY THE CARBON DIOXIDE AND OXYGEN DETECTORS, RESPECTIVELY.
Claim 13
Dependent Claim
83 words
FLOWING THE GAS FROM THE COMBUSTION ZONE AFTER PASSING THROUGH THE CARBON DIOXIDE DETECTOR OF STEP (2) ABOVE, INTO A CONTINUOUS QUANTITATIVE DETECTOR FOR GASEOUS OXYGEN AND WHILE CONTINUING TO FLOW THE FEED GAS STREAM, INJECTING A SMALL AMOUNT OF THE AQUEOUS DISPERSION OF A COMBUSTIBLE MATERIAL INTO THE COMBUSTION ZNE UPSTREAM FROM THE CATALYST BED, WHEREBY ELECTRICAL SIGNALS CORRELATIVE WITH THE CARBON CONTENT OF THE AQUEOUS SAMPLE AND ITS TOTAL OXYGEN DEMAND ARE PRODUCED BY THE CARBON DIOXIDE AND OXYGEN DETECTORS, RESPECTIVELY.
Claim 14
Independent Claim
72 words
A method for determining the degree of oxidation change in a process stream which comprises generating signals proportional, respectively, to a ratio of the total oxygen demand and the total carbon in the influent stream to an oxidative reaction zone and in the effluent stream from said zone and combining said signals to generate a signal the value of which is an index of the degree of oxidation occurring in said zone.
Claim 15
Independent Claim
72 words
A method for determining the degree of oxidation change in a process stream which comprises generating signals proportional, respectively, to a ratio of the total oxygen demand and the total carbon in the influent stream to an oxidative reaction zone and in the effluent stream from said zone and combining said signals to generate a signal the value of which is an index of the degree of oxidation occurring in said zone.
Claim 16
Dependent Claim
29 words
A method according to claim 3 wherein the process stream is sewage and the derived value is a measure of the degree of nitrification occurring in the oxidative process.
References Cited (Backward Citations)
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |