Near infrared spectroscopy applied for high-pressure phase behavior measurements

Borges, Gustavo R.; Lucas, Marcos A.; Nunes, Rafael B.de Moura; Amaral, Monique; Franceschi, Elton; Santos, Alexandre F.; Dariva, Cláudio

doi:10.1016/j.supflu.2015.06.015

Cited by 9 publications

(1 citation statement)

References 38 publications

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“…Recent work has also shown the possibility of using a near-IR probe inserted in a high-pressure cell for the determination of CO 2 -hydrocarbon phase equilibrium under pressure (up to 20 MPa) at temperatures below 80 °C. 16 However, gases such as H 2 , N 2 , and O 2 whose contribution is often significant in geothermal fluids are not detectable by IR spectroscopy. Indeed, it is well known that diatomic homonuclear molecules are active in Raman scattering and inactive in IR while other gases, e.g., CO 2 , CO, CH 4 , NH 3 , etc., can be monitored by both techniques.…”

Section: Introductionmentioning

confidence: 99%

Co-Localized Infrared–Raman Spectroscopy: An Innovative Approach for the Quantitative In Situ Analysis of Gas Mixtures at High Pressures

Boé,

Bruneel,

Tassaing

2024

Appl Spectrosc

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This article spotlights the interest in using co-localized infrared (IR)–Raman spectroscopy as an innovative approach for the in situ monitoring of complex gas mixtures, e.g., hydrogen (H2), nitrogen (N2), carbon monoxide (CO), carbon dioxide (CO2), and methane (CH4), at elevated pressures. Thus, by combining the IR and Raman spectra of CH4, we proposed a new methodology for the calibration of the Raman spectra to circumvent the fact that Raman intensities are arbitrary (laser power, instrument response, integration time, and fluorescence). Applying our methodology to scale several consecutive experiments, the concentrations of all gases were determined with a relative uncertainty lower than 10%. These original results highlight the interest in co-localized IR–Raman spectroscopy analysis in a single cell for the quantitative analysis of solutes by Raman spectroscopy without the use of an internal standard.

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Section: Introductionmentioning

confidence: 99%