CN112697907A - Analysis system for total hydrocarbons of methane and non-methane in carbon dioxide - Google Patents
Analysis system for total hydrocarbons of methane and non-methane in carbon dioxide Download PDFInfo
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- CN112697907A CN112697907A CN202011452877.6A CN202011452877A CN112697907A CN 112697907 A CN112697907 A CN 112697907A CN 202011452877 A CN202011452877 A CN 202011452877A CN 112697907 A CN112697907 A CN 112697907A
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- switching valve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N30/68—Flame ionisation detectors
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention discloses a system for analyzing methane and non-methane total hydrocarbons in carbon dioxide, which comprises a first switching valve, a second switching valve, a sample inlet, a sample outlet, a first chromatographic column, a second chromatographic column, a third chromatographic column, a needle valve and a hydrogen flame ionization detector, wherein a first interface of the first switching valve is connected with the sample inlet through a gas pipeline, a second interface of the first switching valve is connected with the sample outlet through a gas pipeline, a third interface of the first switching valve is connected with a tenth interface of the first switching valve through a gas pipeline, a quantitative ring is arranged on the third interface of the first switching valve and the gas pipeline connected with the tenth interface of the first switching valve, and a fourth interface of the first switching valve is connected with a second carrier gas through a gas pipeline. The invention can detect CH in carbon dioxide4And NMHC component, the detection limit can reach ppb level.
Description
Technical Field
The invention relates to the technical field of back-blowing heavy component analysis, in particular to a system for analyzing total hydrocarbons of methane and non-methane in carbon dioxide.
Background
Carbon dioxide (CO)2) The carbon dioxide is colorless, slightly odorous and nontoxic gas, is prepared by taking industrial carbon dioxide as a raw material (99.999 percent) and is mainly used in the fields of laser, coolant and the like. The hydrocarbon in carbon dioxide influences the use effect, and the carbon dioxide is designed for the purposeMethane and non-methane total hydrocarbon analysis system in the carbon monoxide.
Disclosure of Invention
The invention aims to provide an analysis system for methane and non-methane total hydrocarbons in high-purity carbon dioxide, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the system for analyzing methane and non-methane total hydrocarbons in carbon dioxide comprises a first switching valve, a second switching valve, a sample inlet, a sample outlet, a first chromatographic column, a second chromatographic column, a third chromatographic column, a needle valve and a hydrogen flame ionization detector, wherein a first interface of the first switching valve is connected with the sample inlet through a gas pipeline, a second interface of the first switching valve is connected with the sample outlet through a gas pipeline, a third interface of the first switching valve is connected with a tenth interface through a gas pipeline, a quantitative ring is arranged on a third interface of the first switching valve and the gas pipeline connected with the tenth interface, a fourth interface of the first switching valve is connected with a second carrier gas through a pipeline, a fifth interface of the first switching valve is connected with the inlet of the second chromatographic column through a gas pipeline, and a sixth interface of the first switching valve is connected with a ninth interface of the first switching valve through a gas pipeline, the first chromatographic column is arranged on the gas path pipeline which is connected with the No. six interface and the No. nine interface of the first switching valve, the seventh interface of the first switching valve is connected with the first carrier gas through a gas pipeline, the eighth interface of the first switching valve is connected with the sixth interface of the second switching valve through a gas pipeline, the first interface of the second switching valve is connected with the needle valve through an air passage pipeline, the second interface of the second switching valve is connected with the fourth interface of the second switching valve through a short-circuit air passage pipeline, the third interface of the second switching valve is connected with a third carrier gas through a gas pipeline, the fifth interface of the second switching valve is connected with the inlet of a third chromatographic column through a gas pipeline, the sixth interface of the second switching valve is connected with the eighth interface of the first switching valve through an air pipeline, and the outlet of the second chromatographic column and the outlet of the third chromatographic column are combined together and then connected to the hydrogen flame ionization detector.
Preferably, the first switching valve is a ten-way valve, and the second switching valve is a six-way valve.
Compared with the prior art, the invention has the beneficial effects that:
the invention can detect CH in carbon dioxide4And NMHC component, the detection limit can reach ppb level.
Drawings
FIG. 1 is a diagram of a sampling state of the present invention.
FIG. 2 is a diagram of the analysis of methane state according to the present invention.
FIG. 3 is a diagram of the present invention for analyzing non-methane total hydrocarbons.
In the figure: 1-a first switching valve; 2-a second switching valve; 3-a quantification ring; 4-a sample inlet; 5-a sample outlet; 6-a first carrier gas; 7-a second carrier gas; 8-a first chromatography column; 9-a second chromatographic column; 10-third chromatography column; 11-needle type valve; 12-a third carrier gas; 13-short-connecting the gas path pipeline; 14-hydrogen flame ionization detector
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: an analysis system for methane and non-methane total hydrocarbons in carbon dioxide comprises a first switching valve 1, a second switching valve 2, a sample inlet 4, a sample outlet 5, a first chromatographic column 8, a second chromatographic column 9, a third chromatographic column 10, a needle valve 11 and a hydrogen flame ionization detector 14, wherein a first interface of the first switching valve 1 is connected with the sample inlet 4 through a gas pipeline, a second interface of the first switching valve 1 is connected with the sample outlet 5 through a gas pipeline, a third interface of the first switching valve 1 is connected with a tenth interface thereof through a gas pipeline, a quantitative ring 3 is arranged on the third interface of the first switching valve 1 and the gas pipeline connected with the tenth interface thereof, a fourth interface of the first switching valve 1 is connected with a second carrier gas 7 through a gas pipeline, a fifth interface of the first switching valve 1 is connected with an inlet of the second chromatographic column 9 through a gas pipeline, a sixth interface of the first switching valve 1 is connected with a ninth interface thereof through a gas pipeline, the first chromatographic column 8 is arranged on a gas path pipeline connected with a sixth interface of the first switching valve 1 and a ninth interface thereof, a seventh interface of the first switching valve 1 is connected with the first carrier gas 6 through a gas path pipeline, an eighth interface of the first switching valve 1 is connected with a sixth interface of the second switching valve 2 through a gas path pipeline, a first interface of the second switching valve 2 is connected with the needle valve 11 through a gas path pipeline, a second interface of the second switching valve 2 is connected with a fourth interface thereof through a gas path pipeline, a third interface of the second switching valve 2 is connected with the third carrier gas 12 through a gas path pipeline, a fifth interface of the second switching valve 2 is connected with an inlet of the third chromatographic column 10 through a gas path pipeline, a sixth interface of the second switching valve 2 is connected with an eighth interface of the first switching valve 1 through a gas path pipeline, and an outlet of the second chromatographic column 9 and an outlet of the third chromatographic column 10 are combined together and then connected to the hydrogen flame ionization detector 14.
Specifically, the first switching valve 1 is a ten-way valve, and the second switching valve 2 is a six-way valve.
Sampling: the sample sequentially passes through the first interface, the tenth interface, the quantitative ring 3 and the third interface of the first switching valve 1 and is finally discharged from the second interface of the first switching valve 1;
the analysis process comprises the following steps: switching the first switching valve 1, the second carrier gas 7 carrying the sample in the quantification loop 3 through the first chromatographic column 8; methane is detected by the second chromatographic column 9 through the hydrogen flame ionization detector 14, and the carbon dioxide component and the non-methane total hydrocarbon component which are carried by the first carrier gas 6 and remain in the first chromatographic column 8 are released from the needle valve 11 through the first connection port of the second switching valve 2.
When carbon dioxide is completely discharged from the needle valve 11, as shown in fig. 1, the second switching valve 2 is switched and non-methane total hydrocarbons are detected by the hydrogen flame ionization detector 14 through the third column 10.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. Methane and non-methane total hydrocarbon analytic system in carbon dioxide, its characterized in that: the quantitative analysis device comprises a first switching valve, a second switching valve, a sample inlet, a sample outlet, a first chromatographic column, a second chromatographic column, a third chromatographic column, a needle valve and a hydrogen flame ionization detector, wherein a first interface of the first switching valve is connected with the sample inlet through an air pipeline, a second interface of the first switching valve is connected with the sample outlet through an air pipeline, a third interface of the first switching valve is connected with a tenth interface of the first switching valve through an air pipeline, a quantitative ring is arranged on a third interface of the first switching valve and the air pipeline connected with the tenth interface of the first switching valve, a fourth interface of the first switching valve is connected with a second carrier gas through an air pipeline, a fifth interface of the first switching valve is connected with the inlet of the second chromatographic column through an air pipeline, a sixth interface of the first switching valve is connected with a ninth interface of the first switching valve through an air pipeline, and the first chromatographic column is arranged on the air pipeline connected with the sixth interface of the first switching valve and the ninth interface of the first switching valve, the interface seven of the first switching valve is connected with a first carrier gas through a gas path pipeline, the interface eight of the first switching valve is connected with the interface six of the second switching valve through a gas path pipeline, the interface one of the second switching valve is connected with the needle valve through a gas path pipeline, the interface two of the second switching valve is connected with the interface four of the second switching valve through a short-circuit gas path pipeline, the interface three of the second switching valve 2 is connected with a third carrier gas through a gas path pipeline, the interface five of the second switching valve is connected with the inlet of the third chromatographic column through a gas path pipeline, the interface six of the second switching valve is connected with the interface eight of the first switching valve through a gas path pipeline, and the outlet of the second chromatographic column is combined with the outlet of the third chromatographic column and then connected to the hydrogen flame ionization detector.
2. The system for analyzing total hydrocarbons of methane and non-methane in carbon dioxide according to claim 1, wherein: the first switching valve adopts a ten-way valve, and the second switching valve adopts a six-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011452877.6A CN112697907A (en) | 2020-12-11 | 2020-12-11 | Analysis system for total hydrocarbons of methane and non-methane in carbon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011452877.6A CN112697907A (en) | 2020-12-11 | 2020-12-11 | Analysis system for total hydrocarbons of methane and non-methane in carbon dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112697907A true CN112697907A (en) | 2021-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011452877.6A Pending CN112697907A (en) | 2020-12-11 | 2020-12-11 | Analysis system for total hydrocarbons of methane and non-methane in carbon dioxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112697907A (en) |
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2020
- 2020-12-11 CN CN202011452877.6A patent/CN112697907A/en active Pending
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