Carbon isotope analysis method for series of hydrocarbon compounds in natural gas

A carbon isotope and analysis method technology, applied in analytical materials, material separation, measurement devices, etc., can solve the problems of difficult sample pretreatment, isotope fractionation, complex operation process, etc., and achieve rapid and effective enrichment and carbon isotope analysis. Effect

Inactive Publication Date: 2014-07-09
LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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Problems solved by technology

[0004] As early as the early 1990s, an on-line analysis method for carbon isotopes of conventionally contained hydrocarbons in natural gas had been established. However, due to the relatively low sensitivity of the GC-IRMS system, for carbon, it takes an average of 5 nmol for a single compound to reach the normal range of the instrument. However, the concentration of trace hydrocarbons in natural gas generally decreases significantly with the increase of carbon number, and its cont

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  • Carbon isotope analysis method for series of hydrocarbon compounds in natural gas
  • Carbon isotope analysis method for series of hydrocarbon compounds in natural gas
  • Carbon isotope analysis method for series of hydrocarbon compounds in natural gas

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[0055] The present invention will be described in detail below with reference to specific embodiments.

[0056] The present invention is divided into several parts, such as enrichment by SPME device, chromatographic separation of compounds, characterization of hydrocarbon compounds, and isotopic analysis of specific compounds. The process of the present invention is as follows: the stationary phase fiber head is placed in the sample to be extracted ( figure 1 ), after equilibration, it was quickly taken out and inserted into the GC injection port, the target compound was thermally desorbed, and then the sample was introduced into the chromatographic column by the mobile phase and separated into individual compounds, and the product was introduced into IRMS for carbon isotope determination.

[0057] First, the choice of stationary phase coating

[0058] The stationary phase fiber coating is a core component of the SPME device. How to choose a stationary phase should first con...

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Abstract

The invention belongs to the technical field of analysis methods for natural gas and especially relates to a carbon isotope analysis method for a series of hydrocarbon compounds in natural gas. The method comprises the following steps: step A, carrying out solid-phase micro-extraction enrichment on a series of hydrocarbon compounds in natural gas; step B, separating the hydrocarbon compounds and carrying out qualitative analysis on unknown hydrocarbon compounds; and step C, carrying out carbon isotope determination on the hydrocarbon compounds. According to the invention, solid-phase micro-extraction technology is introduced into a natural gas isotope analysis method and combined with a GC-IRMS analysis system, influence of factors like equilibrium time and equilibrium temperature on difference of adsorption capability of the hydrocarbon compounds and on carbon isotope values are analyzed, and operation conditions are optimized, so effective enrichment and carbon isotope composition analysis of the series of hydrocarbon compounds in natural gas are realized. The method provided by the invention can realize rapid and effective enrichment and carbon isotope composition analysis of the series of hydrocarbon compounds in natural gas.

Description

technical field [0001] The invention relates to the technical field of analysis methods for natural gas, in particular to a method for analyzing carbon isotopes of a series of hydrocarbon compounds in natural gas. Background technique [0002] The stable isotopic composition of specific compounds has gradually developed into an important tracer tool and plays an important role in many disciplines such as earth science, environmental science, and ecology. This technology has been realized since the 1980s with the successful docking of Gas Chromatography (GC) and Isotope Ratio Mass Spectrometry (IRMS). 13 C / 12 C. 2 H / 1 H. 15 N / 14 N. 18 O / 16 Isotopic composition analysis of elements such as O. Due to the special status of carbon isotopes in nature, its isotopic composition has been widely used in oil and gas geochemistry, environmental geochemistry, biogeochemistry and other fields. For example: in the field of oil and gas geochemistry, the CH in natural gas can be...

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Application Information

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IPC IPC(8): G01N30/88
Inventor 李中平李立武邢蓝田刘艳王作栋曹春辉杜丽杨辉
Owner LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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