US3838969A
Expired / Lapsed
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Elemental analysis of sulfur-containing materials
Assignee: Hercules LLC
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Filing: 1973-05-02
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Granted: 1974-10-01
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Expires: 1993-05-02
Abstract
Abstract An improvement in the elemental analysis of sulfur-containing materials to provide quantative determination of the sulfur content. In a preferred embodiment the elemental analysis of a material to determine its carbon, hydrogen, nitrogen and sulfur content by oxidizing, at elevated temperatures, a sample of the material to convert the carbon, hydrogen, nitrogen and sulfur present in this material to carbon dioxide, water, oxides of nitrogen and oxides of sulfur respectively; passing the resulting mixture of gaseous oxidation products and unreacted oxygen through a reduction zone containing copper at elevated temperatures to reduce the oxides of nitrogen to nitrogen, to convert any sulfur trioxide present to sulfur dioxide, and to remove the unreacted oxygen; passing the resulting mixture of carbon dioxde, water, nitrogen and sulfur dioxide through a separating column and into a detector to quantitatively measure each of the carbon dioxide, water, nitrogen and sulfur dioxide present in the gaseous oxidation product mixture; and calculating the quantity of each of carbon, hydrogen, nitrogen and sulfur present in the original material; is improved by maintaining the reduction zone at temperatures above about 800*C.
Inventors
- 👤 G Dugan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:40
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/005; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/176152; Y10T436/176921; Y10T436/18; Y10T436/188; Y10T436/22; Y10T436/23
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
25 words
IN THE METHOD FOR THE ELEMENTAL ANALYSIS OF A SULFURCONTAINING MATERIAL FOR EACH OF THE ELEMENTS CARBON, HYDROGEN, NITROGEN AND SULFUR BY THE STEPS OF:
Claim 2
Dependent Claim
25 words
IN THE METHOD FOR THE ELEMENTAL ANALYSIS OF A SULFURCONTAINING MATERIAL FOR EACH OF THE ELEMENTS CARBON, HYDROGEN, NITROGEN AND SULFUR BY THE STEPS OF:
Claim 3
Dependent Claim
36 words
OXIDIZING AT ELEVATED TEMPERATURES A SAMPLE OF THE MATERIAL TO BE ANALYZED TI CONVERT THE CARBON, HYDROOGEN, NITROGEN AND SULFUR PRESENT IN THE COMPOUND TO CARBON DIOXIDE, WATER, OXIDES OF NITROGEN AND OXIDES OF SULFUR, RESPECTIVELY,
Claim 4
Dependent Claim
36 words
OXIDIZING AT ELEVATED TEMPERATURES A SAMPLE OF THE MATERIAL TO BE ANALYZED TI CONVERT THE CARBON, HYDROOGEN, NITROGEN AND SULFUR PRESENT IN THE COMPOUND TO CARBON DIOXIDE, WATER, OXIDES OF NITROGEN AND OXIDES OF SULFUR, RESPECTIVELY,
Claim 5
Dependent Claim
44 words
PASSING THE RESULTING MIXTURE OF GASEOUS OXIDATION PRODUCTS AND UNREACTED OXYGEN THROUGH REDUCTION ZONE CONTAINING COPPER MAINTAINED AT ELEVATED TEMPERATURES TO REMOVE THE UNREACTED OXYGEN AND TO REDUCE THE OXIDES OF NITROGEN TO NITROGEN, AND TO CONVERT ANY SULFUR TRIXODE PRESENT INTO SULFUR DIOXIDE,
Claim 6
Dependent Claim
44 words
PASSING THE RESULTING MIXTURE OF GASEOUS OXIDATION PRODUCTS AND UNREACTED OXYGEN THROUGH REDUCTION ZONE CONTAINING COPPER MAINTAINED AT ELEVATED TEMPERATURES TO REMOVE THE UNREACTED OXYGEN AND TO REDUCE THE OXIDES OF NITROGEN TO NITROGEN, AND TO CONVERT ANY SULFUR TRIXODE PRESENT INTO SULFUR DIOXIDE,
Claim 7
Dependent Claim
45 words
passing the resulting mixture of gaseous oxidation products and unreacted oxygen through a reduction zone containing copper maintained at elevated temperatures to remove the unreacted oxygen and to reduce the oxides of nitrogen to nitrogen, and to convert any sulfur trioxide present into sulfur dioxide;
Claim 8
Dependent Claim
45 words
passing the resulting mixture of gaseous oxidation products and unreacted oxygen through a reduction zone containing copper maintained at elevated temperatures to remove the unreacted oxygen and to reduce the oxides of nitrogen to nitrogen, and to convert any sulfur trioxide present into sulfur dioxide;
Claim 9
Dependent Claim
39 words
passing the resulting mixture of sulfur dioxide, sulfur trioxide and unreacted oxygen through a reduction zone containing copper maintained at between about 800*C and 1, 075*C. to remove unreacted oxygen and to convert the sulfur trioxide to sulfur dioxide;
Claim 10
Dependent Claim
39 words
passing the resulting mixture of sulfur dioxide, sulfur trioxide and unreacted oxygen through a reduction zone containing copper maintained at between about 800*C and 1, 075*C. to remove unreacted oxygen and to convert the sulfur trioxide to sulfur dioxide;
Claim 11
Dependent Claim
18 words
The method of claim 1 wherein the reduction zone is maintained at temperatures between about 800*C. and 850*C.
Claim 12
Dependent Claim
16 words
passing the sulfur dioxide into a detector which quantitatively measures the amount of sulfur dioxide; and
Claim 13
Dependent Claim
16 words
passing the sulfur dioxide into a detector which quantitatively measures the amount of sulfur dioxide; and
Claim 14
Independent Claim
23 words
A method for the analysis of a sulfur-containing organic or inorganic compound for the sulfur content of said compound comprising the steps of:
Claim 15
Independent Claim
23 words
A method for the analysis of a sulfur-containing organic or inorganic compound for the sulfur content of said compound comprising the steps of:
Claim 16
Dependent Claim
35 words
PASSING THE RESULTING MIXTURE OF CARBON DIOXIDE, WATER, NITROGEN AND SULFUR DIOXIDE INTO A DETECTOR TO QUANTIATIVELY MEASURE EACH OF THE CARBON DIOXIDE, WATER, NITROGEN AND SULFUR DIOXIDE IN THE GASEOUS OXIDATION PRODUCT MIXTURE, AND
Claim 17
Dependent Claim
35 words
PASSING THE RESULTING MIXTURE OF CARBON DIOXIDE, WATER, NITROGEN AND SULFUR DIOXIDE INTO A DETECTOR TO QUANTIATIVELY MEASURE EACH OF THE CARBON DIOXIDE, WATER, NITROGEN AND SULFUR DIOXIDE IN THE GASEOUS OXIDATION PRODUCT MIXTURE, AND
Claim 18
Dependent Claim
35 words
passing the resulting mixture of carbon dioxide, water, nitrogen and sulfur dioxide into a detector to quantitatively measure each of the carbon dioxide, water, nitrogen and sulfur dioxide in the gaseous oxidation product mixture; and
Claim 19
Dependent Claim
35 words
passing the resulting mixture of carbon dioxide, water, nitrogen and sulfur dioxide into a detector to quantitatively measure each of the carbon dioxide, water, nitrogen and sulfur dioxide in the gaseous oxidation product mixture; and
Claim 20
Dependent Claim
31 words
calculating the percentage of each of carbon, hydrogen, nitrogen and sulfur present in the original sample; the improvement which comprises maintaining the reduction zone at temperatures between about 800*C. and 1,075*C.
Claim 21
Dependent Claim
31 words
calculating the percentage of each of carbon, hydrogen, nitrogen and sulfur present in the original sample; the improvement which comprises maintaining the reduction zone at temperatures between about 800*C. and 1,075*C.
Claim 22
Dependent Claim
10 words
calculating the percentage of sulfur present in the original compound.
Claim 23
Dependent Claim
10 words
calculating the percentage of sulfur present in the original compound.
Claim 24
Dependent Claim
31 words
CALCULATING THE PERCENTAGE OF EACH OF CARBON, HYDROGEN, NITROGEN AND SULFUR PRESENT IN THE ORGANAL SAMPLE, THE IMPROVEMENT WHICH COMPRISES MAINTAINING THE REDUCTION ZONE AT TEMPERATURES BETWEEN ABOUT 800*C. AND 1,075*C.
Claim 25
Dependent Claim
31 words
CALCULATING THE PERCENTAGE OF EACH OF CARBON, HYDROGEN, NITROGEN AND SULFUR PRESENT IN THE ORGANAL SAMPLE, THE IMPROVEMENT WHICH COMPRISES MAINTAINING THE REDUCTION ZONE AT TEMPERATURES BETWEEN ABOUT 800*C. AND 1,075*C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |