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Method for analyzing carbon isotopes of micro single hydrocarbons in natural gas

A carbon isotope and compound technology, which is applied in the field of carbon isotope analysis and testing of trace hydrocarbon compounds and monomer hydrocarbons in natural gas, can solve problems such as lack of analytical methods, and achieve significant enrichment effect, good use and promotion value, and good repeatability. Effect

Inactive Publication Date: 2011-11-23
LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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Problems solved by technology

In general, the lack of systematic analysis methods is the main reason for this problem

Method used

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  • Method for analyzing carbon isotopes of micro single hydrocarbons in natural gas
  • Method for analyzing carbon isotopes of micro single hydrocarbons in natural gas
  • Method for analyzing carbon isotopes of micro single hydrocarbons in natural gas

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but is not limited thereto.

[0039] The present invention for the first time utilizes the solid-phase micro-extraction technology to effectively enrich the trace component hydrocarbon compounds in natural gas, and uses gas chromatography-isotope ratio mass spectrometer (GC-IRMS) to test the carbon isotope of monomer hydrocarbons.

[0040] figure 1 It is a flow chart of the monomer hydrocarbon carbon isotope testing system.

[0041] The type of solid phase microextraction head of the present invention is divinylbenzene / carbon molecular sieve / polydimethylsiloxane (DVB / CAR / PDMS). The handle of solid phase microextraction is manual type. The extracted silk is aged at 280°C for about 3 hours before application. Before the extraction of trace hydrocarbons, the natural gas sample was first put into a glass vial with a silica gel stopper, and the rub...

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Abstract

The invention relates to a method for analyzing carbon isotopes of micro single hydrocarbons in natural gas. The method is characterized by utilizing a divinyl benzene / carbon molecular sieve / polydimethylsiloxane (DVB / CAR / PDMS) composite adsorbing material to enrich the microcomponents in the hydrocarbons, carrying out thermal desorption at the gas chromatography injection port and carrying out separation through gas chromatography and analyzing the carbon isotopes of the single hydrocarbons by isotope ratio mass spectrometry. The method has the following beneficial effects: the method has the advantages of high carbon isotope testing precision and good repeatability, conforms to the research needs, is simple to operate and has good use and popularization values.

Description

technical field [0001] The invention relates to a test method for natural gas, in particular to a carbon isotope analysis test method for trace hydrocarbon compound monomer hydrocarbons in natural gas. Background technique [0002] With the stable isotope ratio (such as 13 C / 12 C. 2 H / 1 H. 18 O / 16 O. 15 N / 14 N, etc.) have conducted in-depth research in earth science, ecology, environmental science, etc., and their traditional Bulk Sample Isotope Analysis (BSIA) has been unable to meet the needs of research. Since the late 1980s, the improvement of sample separation technology and the successful docking of gas chromatography (Gas Chromatography, GC) and stable isotope ratio mass spectrometry (Isotope Ratio Mass Spectrometry, IRMS) have enabled the isotope ratio analysis of specific molecular compounds ( Compound Specific Isotope Analysis, CSIA) became a reality. Especially because of the special status of carbon isotope in nature, its isotopic composition has bec...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/08G01N30/10
Inventor 李中平李立武曹春辉王作栋杜丽陶明信
Owner LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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