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Method for analysis chromatographic separation of hydrocarbon compound carbon isotopes in natural gas

A carbon isotope and chromatographic separation technology, which is applied in the field of chromatographic separation of carbon isotope analysis of hydrocarbon compounds in natural gas, can solve problems such as data fluctuation and small injection volume, and achieve the effects of high accuracy, simple operation and strong specificity

Inactive Publication Date: 2018-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to accurately determine the carbon isotope values ​​of hydrocarbon gases in natural gas, people have developed an online analysis method. Although the online analysis method can be quickly separated and detected, due to the small amount of sample injected (about 10 μL) in the online system, the data is prone to fluctuations. Therefore, the method of manual sampling, chromatographic separation and enrichment of hydrocarbon gases, and the detection of hydrocarbon gases in natural gas by isotope mass spectrometer is an effective method to achieve accurate determination of hydrocarbon gas isotopes in natural gas, suitable chromatographic separation conditions It is the key factor to determine whether the hydrocarbon gas in natural gas can be accurately determined

Method used

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  • Method for analysis chromatographic separation of hydrocarbon compound carbon isotopes in natural gas
  • Method for analysis chromatographic separation of hydrocarbon compound carbon isotopes in natural gas
  • Method for analysis chromatographic separation of hydrocarbon compound carbon isotopes in natural gas

Examples

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Effect test

Embodiment 1

[0021] Example 1 Hydrocarbon carbon isotope analysis chromatographic separation method in natural gas

[0022] The steps are as follows: 3ml natural gas sample is taken by the injector, injected into the sample loop of the gas chromatograph, and enters the packed column through the sample loop, carries out chromatographic separation, and collects the separated hydrocarbon compounds (methane, ethane, propane, butane alkane and pentane); chromatographic equipment and conditions are as follows:

[0023] Gas chromatograph: Agilent 6890;

[0024] Chromatographic column: propack N packed column;

[0025] Carrier gas flow rate: 5mL / min;

[0026] Heating program: the initial temperature is 40°C, and then the temperature is raised to 165°C at 3°C / min;

[0027] Injection volume: 3mL;

[0028] Chromatograms such as figure 1 It can be seen from the figure that the propack N packed column cannot effectively separate the hydrocarbon gases in natural gas.

Embodiment 2

[0029] Example 2 Chromatographic Separation Method for Carbon Isotope Analysis of Hydrocarbons in Natural Gas

[0030] The steps are as follows: 3ml natural gas sample is taken by the injector, injected into the sample loop of the gas chromatograph, and enters the packed column through the sample loop, carries out chromatographic separation, and collects the separated hydrocarbon compounds (methane, ethane, propane, butane alkane and pentane); chromatographic equipment and conditions are as follows:

[0031] Gas chromatograph: Agilent 6890;

[0032] Chromatographic column: propack Q packed column;

[0033] Carrier gas flow rate: 5mL / min;

[0034] Heating program: the initial temperature is 40°C, and then the temperature is raised to 165°C at 3°C / min;

[0035] Injection volume: 3mL;

[0036] Chromatograms such as figure 2 It can be seen from the figure that the hydrocarbon gas in the chromatogram has obvious tailing phenomenon, indicating that the selected carrier gas flo...

Embodiment 3

[0037] Example 3 Chromatographic separation method for carbon isotope analysis of hydrocarbons in natural gas

[0038] The steps are as follows: 3ml natural gas sample is taken by the injector, injected into the sample loop of the gas chromatograph, and enters the packed column through the sample loop, carries out chromatographic separation, and collects the separated hydrocarbon compounds (methane, ethane, propane, butane alkane and pentane); chromatographic equipment and conditions are as follows:

[0039] Gas chromatograph: Agilent 6890;

[0040] Chromatographic column: propack Q packed column;

[0041] Carrier gas flow rate: 18mL / min;

[0042] Heating program: the initial temperature is 40°C, and then the temperature is raised to 165°C at 3°C / min;

[0043] Injection volume: 3mL;

[0044] Chromatograms such as image 3 As shown, it can be seen from the figure that the peak eluting time of the hydrocarbon gas in the chromatogram is relatively short, and some of the peak...

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Abstract

The invention discloses a method for analysis chromatographic separation of hydrocarbon compound carbon isotopes in natural gas, wherein the method comprises the following steps: (1) taking a naturalgas sample, injecting into a sample loop of a gas chromatography instrument, allowing to enter a filling column, carrying out chromatographic separation, and setting a chromatographic temperature-raising program: setting the initial temperature to 40 DEG C, making the temperature constant for 1 minute, then heating to 165 DEG C at a speed of 5 DEG C / min, making the temperature constant for 15 minutes, taking helium gas as a carrier gas, setting the flow rate at 13 mL / min, and taking the filling column as propack Q filling column; and collecting a separated hydrocarbon compound; and (2) carrying out carbon isotope analysis. The method combines the chromatographic separation method and the program switching valve; during chromatographic separation, suitable peak appearing intervals exist between chromatographic peaks; with cooperation of the program switching valve, subsequent manual preparation of hydrocarbon gas is facilitated. The problem that accurate and effective separation and enrichment of hydrocarbon gas in natural gas is difficult is solved, and then accurate determination of the hydrocarbon gas isotopes is realized.

Description

technical field [0001] The invention relates to a chromatographic separation method for carbon isotope analysis of hydrocarbon compounds in natural gas, belonging to the technical field of natural gas analysis methods. Background technique [0002] Hydrocarbon gas isotopes in natural gas have been widely used in the field of geochemical research. At present, they have been widely used in the identification of natural gas origin, identification of organic and inorganic natural gas, and identification of bio-thermocatalytic transition zone gas. Therefore, to achieve Accurate identification of hydrocarbon gas isotopes in natural gas has important theoretical and practical significance. [0003] In order to accurately determine the carbon isotope values ​​of hydrocarbon gases in natural gas, people have developed an online analysis method. Although the online analysis method can be quickly separated and detected, due to the small amount of sample injected (about 10 μL) in the on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/72
CPCG01N30/06G01N30/72
Inventor 翟正李钜源王学军李祥臣刘庆李政陶军明綦艳丽王宝山鲍燕张蕾韩冬梅林晶赵兰全王大洋
Owner CHINA PETROLEUM & CHEM CORP
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