US4066402A
Expired / Lapsed
US
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Analytical method and apparatus for determination of total nitrogen and/or carbon contents in aqueous systems
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1976-05-14
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Granted: 1978-01-03
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Expires: 1996-05-14
Abstract
Abstract An analytical method for determining rapidly and accurately the total nitrogen and/or carbon contents in aqueous systems containing nitrogenous and/or carbonaceous materials, which comprises introducing an aqueous solution containing nitrogenous and/or carbonaceous materials as a specimen to be analyzed together with a carrier gas into a reactor tube packed with a destructive oxidation catalyst and/or a reducing agent and/or an oxidizing agent and maintaining said solution at certain elevated temperatures so as to decompose the nitrogenous and/or carbonaceous materials to nitrogen and/or carbon dioxide and measuring the amounts of nitrogen and/or carbon dioxide in the resulting gaseous mixture by the use of a thermal conductivity gas chromatograph, and an apparatus to be used for carrying out such method.
Inventors
- 👤 Yoshiki Komiyama
- 👤 Seiya Yamamoto
- 👤 Yoshiaki Yasumasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:44
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/182; G01N33/1826; G01N33/1846; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/176152; Y10T436/176921; Y10T436/23; Y10T436/235
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
111 words
An analytical method for determination of the total nitrogen and/or carbon contents in an aqueous solution containing nitrogenous and/or carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no nitrogen and/or carbon dioxide as a carrier gas into a reactor tube packed with a destructive oxidation catalyst and/or a reducing agent and/or an oxidizing agent, maintaining the reaction tube at elevated temperatures so as to decompose the nitrogenous and/or carbonaceous materials to nitrogen and/or carbon dioxide and measuring the amounts of nitrogen and/or carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph.
Claim 2
Dependent Claim
111 words
An analytical method for determination of the total nitrogen and/or carbon contents in an aqueous solution containing nitrogenous and/or carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no nitrogen and/or carbon dioxide as a carrier gas into a reactor tube packed with a destructive oxidation catalyst and/or a reducing agent and/or an oxidizing agent, maintaining the reaction tube at elevated temperatures so as to decompose the nitrogenous and/or carbonaceous materials to nitrogen and/or carbon dioxide and measuring the amounts of nitrogen and/or carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph.
Claim 3
Dependent Claim
24 words
The method according to claim 1, wherein the reactor tube is packed with a destructive oxidation catalyst, a reducing agent and an oxidizing agent.
Claim 4
Dependent Claim
37 words
The method according to claim 2, wherein the destructive oxidation catalyst, the reducing agent and the oxidizing agent are heated at 700° to 1200° C, at 300° to 700° C and at 300° to 700° C, respectively.
Claim 5
Dependent Claim
21 words
The method according to claim 1, wherein the reactor tube is packed with a destructive oxidation catalyst and a reducing agent.
Claim 6
Dependent Claim
29 words
The method according to claim 4, wherein the destructive oxidation catalyst and the reducing agent are heated at 700° to 1200° C and at 300° to 700° C, respectively.
Claim 7
Dependent Claim
21 words
The method according to claim 1, wherein the reactor tube is packed with a destructive oxidation catalyst and an oxidizing agent.
Claim 8
Dependent Claim
29 words
The method according to claim 6, wherein the destructive oxidation catalyst and the oxidizing agent are heated at 700° to 1200° C and at 300° to 700° C, respectively.
Claim 9
Dependent Claim
22 words
The method according to claim 6, wherein the destructive oxidation catalyst and the oxidizing agent are heated at 700° to 1200° C.
Claim 10
Dependent Claim
16 words
The method according to claim 1, wherein the reactor tube is packed with an oxidizing agent.
Claim 11
Dependent Claim
17 words
The method according to claim 9, wherein the oxidizing agent is heated at 700° to 1200° C.
Claim 12
Dependent Claim
33 words
The method according to claim 1, wherein the destructive oxidation catalyst comprises at least one metal selected from the group consisting of metals belonging to Group IB or VIII in the periodic table.
Claim 13
Dependent Claim
13 words
The method according to claim 11, wherein the metal is platinum or palladium.
Claim 14
Dependent Claim
27 words
The method according to claim 1, wherein the reducing agent comprises at least one metal selected from the group consisting of copper, nickel, iron, cobalt and zinc.
Claim 15
Dependent Claim
15 words
The method according to claim 13, wherein the metal is reduced copper or reduced nickel.
Claim 16
Dependent Claim
30 words
The method according to claim 1, wherein the oxidizing agent comprises at least one oxide selected from the group consisting of oxides of cobalt, nickel, vanadium, tungsten, silver and manganese.
Claim 17
Dependent Claim
13 words
The method according to claim 15, wherein the oxide is oxides of cobalt.
Claim 18
Dependent Claim
134 words
An analytical method for determination of the total nitrogen and carbon contents in an aqueous solution containing nitrogenous and carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no nitrogen and carbon dioxide as a carrier gas into a reactor tube packed with a destructive oxidation catalyst, a reducing agent and an oxidizing agent so as to decompose the nitrogenous and carbonaceous materials respectively to nitrogen and carbon dioxide and measuring the amounts of nitrogen and carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the destructive oxidation catalyst, the reducing agent and the oxidizing agent being heated at 700° to 1200° C, at 300° to 700° C and at 300° to 700° C, respectively.
Claim 19
Dependent Claim
134 words
An analytical method for determination of the total nitrogen and carbon contents in an aqueous solution containing nitrogenous and carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no nitrogen and carbon dioxide as a carrier gas into a reactor tube packed with a destructive oxidation catalyst, a reducing agent and an oxidizing agent so as to decompose the nitrogenous and carbonaceous materials respectively to nitrogen and carbon dioxide and measuring the amounts of nitrogen and carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the destructive oxidation catalyst, the reducing agent and the oxidizing agent being heated at 700° to 1200° C, at 300° to 700° C and at 300° to 700° C, respectively.
Claim 20
Dependent Claim
12 words
The method according to claim 17, wherein the inert gas is helium.
Claim 21
Dependent Claim
27 words
The method according to claim 17, wherein the reactor tube is packed with the destructive oxidation catalyst, the reducing agent and the oxidizing agent in this order.
Claim 22
Dependent Claim
107 words
An analytical method for determination of the total nitrogen content in an aqueous solution containing nitrogenous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no nitrogen as a carrier gas into a reactor tube packed with a destructive oxidation catalyst and a reducing agent so as to decompose the nitrogenous materials to nitrogen and measuring the amount of nitrogen in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the destructive oxidation catalyst and the reducing agent being heated at 700° to 1200° C and at 300° to 700° C, respectively.
Claim 23
Dependent Claim
107 words
An analytical method for determination of the total nitrogen content in an aqueous solution containing nitrogenous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no nitrogen as a carrier gas into a reactor tube packed with a destructive oxidation catalyst and a reducing agent so as to decompose the nitrogenous materials to nitrogen and measuring the amount of nitrogen in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the destructive oxidation catalyst and the reducing agent being heated at 700° to 1200° C and at 300° to 700° C, respectively.
Claim 24
Dependent Claim
110 words
An analytical method for determination of the total carbon content in an aqueous solution containing carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no carbon dioxide as a carrier gas into a reactor tube packed with a destructive oxidation catalyst and an oxidizing agent so as to decompose the carbonaceous materials to carbon dioxide and measuring the amount of carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the destructive oxidation catalyst and the oxidizing agent being heated at 700° to 1200° C and at 300° to 700° C, respectively.
Claim 25
Dependent Claim
110 words
An analytical method for determination of the total carbon content in an aqueous solution containing carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no carbon dioxide as a carrier gas into a reactor tube packed with a destructive oxidation catalyst and an oxidizing agent so as to decompose the carbonaceous materials to carbon dioxide and measuring the amount of carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the destructive oxidation catalyst and the oxidizing agent being heated at 700° to 1200° C and at 300° to 700° C, respectively.
Claim 26
Dependent Claim
103 words
An analytical method for determination of the total carbon content in an aqueous solution containing carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no carbon dioxide as a carrier gas into a reactor tube packed with a destructive oxidation catalyst and an oxidizing agent so as to decompose the carbonaceous materials to carbon dioxide and measuring the amount of carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the destructive oxidation catalyst and the oxidizing agent being heated at 700° to 1200° C.
Claim 27
Dependent Claim
103 words
An analytical method for determination of the total carbon content in an aqueous solution containing carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no carbon dioxide as a carrier gas into a reactor tube packed with a destructive oxidation catalyst and an oxidizing agent so as to decompose the carbonaceous materials to carbon dioxide and measuring the amount of carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the destructive oxidation catalyst and the oxidizing agent being heated at 700° to 1200° C.
Claim 28
Dependent Claim
93 words
An analytical method for determination of the total carbon content in an aqueous solution containing carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no carbon dioxide as a carrier gas into a reactor tube packed with an oxidizing agent so as to decompose the carbonaceous materials to carbon dioxide and measuring the amount of carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the oxidizing agent being heated at 700° to 1200° C.
Claim 29
Dependent Claim
93 words
An analytical method for determination of the total carbon content in an aqueous solution containing carbonaceous materials as a specimen, which comprises introducing the aqueous solution with an inert gas containing substantially no carbon dioxide as a carrier gas into a reactor tube packed with an oxidizing agent so as to decompose the carbonaceous materials to carbon dioxide and measuring the amount of carbon dioxide in the resulting gaseous mixture from the reactor tube by the use of a thermal conductivity gas chromatograph, the oxidizing agent being heated at 700° to 1200° C.
Claim 30
Dependent Claim
156 words
An analytical apparatus for determination of the total nitrogen and/or carbon contents in an aqueous solution containing nitrogenous and/or carbonaceous materials as a specimen, which comprises a reactor tube provided with an inlet and an outlet, said reactor tube being packed with a destructive oxidation catalyst and/or a reducing agent and/or an oxidizing agent, supply means for introducing an inert gas containing substantially no nitrogen and/or carbon dioxide into the inlet of the reactor tube, an injection means for introducing the specimen to be analyzed into the inlet of the reactor tube, moisture removal means for removing moisture from the gaseous mixture produced in the reaction tube, said moisture removal means being disposed downstream from the outlet of the reactor tube, a gas chromatograph provided with a thermal conductivity detector, and disposed downstream of said moisture removal means, and conduit means for providing connection between the reactor tube, the moisture removal means and said gas chromatograph.
Claim 31
Dependent Claim
156 words
An analytical apparatus for determination of the total nitrogen and/or carbon contents in an aqueous solution containing nitrogenous and/or carbonaceous materials as a specimen, which comprises a reactor tube provided with an inlet and an outlet, said reactor tube being packed with a destructive oxidation catalyst and/or a reducing agent and/or an oxidizing agent, supply means for introducing an inert gas containing substantially no nitrogen and/or carbon dioxide into the inlet of the reactor tube, an injection means for introducing the specimen to be analyzed into the inlet of the reactor tube, moisture removal means for removing moisture from the gaseous mixture produced in the reaction tube, said moisture removal means being disposed downstream from the outlet of the reactor tube, a gas chromatograph provided with a thermal conductivity detector, and disposed downstream of said moisture removal means, and conduit means for providing connection between the reactor tube, the moisture removal means and said gas chromatograph.
Claim 32
Dependent Claim
14 words
The method of claim 1, wherein the inert carrier gas is an oxygen-free gas.
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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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |