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Application of Raman Spectroscopy for Hydrocarbons Characterization

Raman spectroscopy for hydrocarbon speciation is described and recent advances in real time monitoring is highlighted. The vibrational properties of hydrocarbon molecules were modeled using Density Function Theory and results were correlated with Raman spectra.

Product Number: 51317--9145-SG
ISBN: 9145 2017 CP
Author: Igor Kosacki
Publication Date: 2017
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Process environments including deep water oil and gas production systems transmission pipelines and refineries have a great need for instrumentation that can directly measure concentrations and solubilities of hydrocarbons carbon dioxide and hydrogen sulfide. Major pipeline and refinery corrosion failures have occurred due to unmonitored and undetected leaks. Therefore development of new process monitoring technologies will provide enhanced safety and reduce failures.This paper describes recent advances in the development a novel technique to monitor oil and gas production as well as hydrocarbon transmission through application of Raman spectroscopy. The paper aims to correlate and describe vibrational properties of hydrocarbons as a basis for Raman-based detection and quantification. Dynamical properties of hydrocarbon molecules were modeled using Density Function Theory and results were correlated with Raman spectra. The influence of pressure and temperature on vibrational modes of hydrocarbons will be described. The speciation of gas mixtures containing C1 – C4 hydrocarbons and concentration of components were derived from Raman lines analysis. Calibration curves showing the dependence of Raman line intensities as a function of hydrocarbon concentration have been presented to validate the applicability of Raman spectroscopy for detection of gas hydrocarbons.

Keywords: process monitoring, hydrocarbons, Raman spectroscopy, gas speciation

Process environments including deep water oil and gas production systems transmission pipelines and refineries have a great need for instrumentation that can directly measure concentrations and solubilities of hydrocarbons carbon dioxide and hydrogen sulfide. Major pipeline and refinery corrosion failures have occurred due to unmonitored and undetected leaks. Therefore development of new process monitoring technologies will provide enhanced safety and reduce failures.This paper describes recent advances in the development a novel technique to monitor oil and gas production as well as hydrocarbon transmission through application of Raman spectroscopy. The paper aims to correlate and describe vibrational properties of hydrocarbons as a basis for Raman-based detection and quantification. Dynamical properties of hydrocarbon molecules were modeled using Density Function Theory and results were correlated with Raman spectra. The influence of pressure and temperature on vibrational modes of hydrocarbons will be described. The speciation of gas mixtures containing C1 – C4 hydrocarbons and concentration of components were derived from Raman lines analysis. Calibration curves showing the dependence of Raman line intensities as a function of hydrocarbon concentration have been presented to validate the applicability of Raman spectroscopy for detection of gas hydrocarbons.

Keywords: process monitoring, hydrocarbons, Raman spectroscopy, gas speciation

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