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
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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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