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Chromatographic analysis device and method for methane and non-methane hydrocarbon

A non-methane total hydrocarbon, chromatographic analysis technology, applied in the direction of measurement device, analysis material, material separation, etc., can solve the problems of cumbersome analysis process, inaccurate measurement results, long analysis period, etc., to achieve short analysis time, realize analysis and measurement Effect

Pending Publication Date: 2022-05-13
FOCUSED PHOTONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The analysis process of this method is cumbersome, the analysis period is long, and the real-time requirements of online analysis are guaranteed; at the same time, water will be introduced into the sample gas during low-temperature enrichment, and the sample gas needs to be dewatered. Improper dewatering treatment will lead to measurement results The inaccuracy may even cause the FID flame to go out, and the analysis and measurement cannot be carried out normally.

Method used

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  • Chromatographic analysis device and method for methane and non-methane hydrocarbon

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Embodiment 1

[0023] figure 1 Schematically provides the structural diagram of the chromatographic analysis device of the methane and non-methane total hydrocarbons of the embodiment of the present invention, as figure 1 Shown, the chromatographic analysis device of described methane and non-methane total hydrocarbons comprises:

[0024] Multi-way valve 11, quantitative loop 21, chromatographic column 31, constant temperature column box and detector 41;

[0025] The front end of the chromatographic column is filled with a gas-liquid type strong polar stationary phase, and the back end is filled with a gas-solid non-polar stationary phase or a gas-liquid weakly polar stationary phase; when the multi-way valve is switched, the carrier gas carries the quantitative loop The gas to be measured inside passes through the front end and the rear end sequentially, and the carrier gas passes through the rear end and the front end sequentially without the quantitative loop;

[0026] The length of the...

Embodiment 2

[0034] An application example of the chromatographic analysis device and method for methane and non-methane total hydrocarbons according to Example 1 of the present invention.

[0035] In this application example, the front end and the back end are filled with TCEP and polymer beads (Hayesep Q) respectively. ; 50cm polymer pellet column CH 4 The retention time is CH 4 and C 2 The retention time difference ΔT R =28.3S, then the calculated length of the rear end of the chromatographic column is ≥18cm; the retention time of 1mTCEP chromatographic column methane The non-methane total hydrocarbon that comes out first is trichlorethylene, and its retention time is 264S, so the calculated length of the front end of the chromatographic column is ≥16cm.

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Abstract

The invention provides a chromatographic analysis device and method for methane and non-methane hydrocarbon. The chromatographic analysis device for methane and non-methane hydrocarbon comprises a multi-way valve, a quantitative loop, a chromatographic column, a constant-temperature column box and a detector, the front end in the chromatographic column is filled with a gas-liquid type strong-polarity stationary phase, and the rear end in the chromatographic column is filled with a gas-solid non-polarity stationary phase or a gas-liquid weak-polarity stationary phase; when the multi-way valve is switched, carrier gas carries to-be-detected gas in the quantitative loop to pass through the front end and the rear end in sequence, and the carrier gas passes through the rear end and the front end in sequence without the quantitative loop. The device has the advantages of simple structure and the like.

Description

technical field [0001] The invention relates to chromatography, in particular to a chromatographic analysis device and method for methane and non-methane total hydrocarbons. Background technique [0002] At present, the analysis methods of methane and non-methane total hydrocarbons mainly include the following methods: [0003] 1. Subtraction method, using 10-way plus 6-way valve double valve, double quantitative loop, double chromatographic column, single FID or double FID to realize the measurement of total hydrocarbons and methane respectively, and the final measurement result of non-methane total hydrocarbons is: non-methane Methane Total Hydrocarbons = Total Hydrocarbons - Methane. The disadvantages of this method are: [0004] The device needs to be matched with 2 valves, which increases the cost of the equipment; the non-methane total hydrocarbons are analyzed by mathematical subtraction, and the double error of the measurement of the total hydrocarbon peak and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
CPCG01N30/88G01N2030/884
Inventor 谯婷俞大海任焱
Owner FOCUSED PHOTONICS
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