Trace heavy hydrocarbon gas isotope sampling system and method

Abstract

The invention provides a trace heavy hydrocarbon gas isotope sampling system and method. The system includes a heavy hydrocarbon gas separating and enriching apparatus, an original sample reaction apparatus, and a finished product sample extraction apparatus, wherein the heavy hydrocarbon gas separating and enriching apparatus receives a sample, separates heavy hydrocarbon gas from methane gas in the sample, and efficiently enriches and separates the heavy hydrocarbon gas; ethane, propane and butane obtained from heavy hydrocarbon gas separation undergo an oxidation reaction in sequence in the original sample reaction apparatus to obtain CO2; and the finished product sample extraction apparatus purifies CO2 gas obtained from the oxidation reaction, removes H2O impurity gas generated at the same time, and allows purified CO2 to be obtained at multiple sample ports from ethane, propane and butane reactions. The trace heavy hydrocarbon gas isotope sampling system and method allow low-concentration trace heavy hydrocarbon gas and methane to be effectively separated and enriched, and the isotopic value of ethane, propane and butane are accurately determined.

Description

Technical field [0001] The invention relates to the technical field of isotope mass spectrometry sample preparation and testing, in particular to a trace heavy hydrocarbon gas isotope sample preparation system and a sample preparation method. Background technique [0002] Natural gas hydrocarbon gas isotope research has been widely used in organic geochemistry. How to accurately determine the carbon isotope value of hydrocarbon gas in natural gas has important theoretical and practical significance. [0003] With the continuous deepening of isotope research, people gradually realized that heavy hydrocarbon gas (C 2+ ) Isotope analysis is extremely important. At present, online analysis and testing methods have been developed. However, in actual research, it is found that the content of methane in natural gas is relatively small compared with that of methane. When methane is in the detection range of the instrument At this time, due to the low content of heavy hydrocarbon gas, the a...

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Problems solved by technology

[0003] With the deepening of isotope research, people gradually realize that heavy hydrocarbon gas (C 2+ ) isotope analysis is of great significance, and an on-line analysis test method has been developed. However, in actual research, it is found that the content of methane and heavy hydrocarbon gas in natural gas is relatively small compared to methane. When methane is within the detection range of the instrument However, due to the small amount of heavy hydrocarbon gas, on-line analytical testing methods cannot accurately detect it. Therefore, how to accurately detect the carbon isotope value of trace heavy hydrocarbon gas has become a common concern of scientific researchers.

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