Synthesis of N2-CH4 and N2-CO2 Gas Mixtures as an Online Standard and Determination of Their Raman Quantification Factors of CH4 and CO2

XI Bin-bin; SHI Wei-jun; JIANG Hong; QIAN Yi-xiong

2014 Vol. 33, No. 5

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Article navigation > Rock and Mineral Analysis > 2014 > 33(5): 655-660

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XI Bin-bin, SHI Wei-jun, JIANG Hong, QIAN Yi-xiong. Synthesis of N2-CH4 and N2-CO2 Gas Mixtures as an Online Standard and Determination of Their Raman Quantification Factors of CH4 and CO2[J]. Rock and Mineral Analysis, 2014, 33(5): 655-660.

Citation:

XI Bin-bin, SHI Wei-jun, JIANG Hong, QIAN Yi-xiong. Synthesis of N₂-CH₄ and N₂-CO₂ Gas Mixtures as an Online Standard and Determination of Their Raman Quantification Factors of CH₄ and CO₂[J]. Rock and Mineral Analysis, 2014, 33(5): 655-660.

Synthesis of N₂-CH₄ and N₂-CO₂ Gas Mixtures as an Online Standard and Determination of Their Raman Quantification Factors of CH₄ and CO₂

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214151, China

Received Date: 09 December 2013

Revised Date: 18 July 2014

Accepted Date: 28 July 2014

Publish Date: 25 May 2014

Abstract

Abstract

Organic and/or inorganic gas composition can be measured quickly and accurately by using a Laser Raman Microprobe with an online standard of gas mixtures. The accuracy of the standard sample plays an important role in this method, but the commercial standard mixed gas cylinders are expensive with fixed composition that cannot be modified arbitrarily. A new method to synthesize the gas mixtures in different compositions under different pressures has been developed. The N₂-CH₄ and N₂-CO₂ gas mixtures with varied N₂ mol contents of 30%, 50% and 70% were synthesized. The pressure of these gas mixtures were increased to 5 and 10 MPa. Both the synthesized and commercial gas mixtures of 70% N₂ and 30% CO₂ have similar relative peak heights and peak areas of N₂ and CO₂. The error of this method is less than 4%. The Raman quantification factor of CH₄ and CO₂ are determined. In this study, the Raman quantification factor is insensitive to composition and pressure under 5 MPa and 10 MPa. This new method is relatively simple, easy and accurate, and only two or more kinds of pure gas cylinders are used to synthesize gas mixtures with different composition and under different pressure, which provides a new way for laser Raman calibration and gas composition measurement in situ.
- gas mixture /
- Laser Raman Microprobe /
- Raman quantification factor

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