Raman Spectroscopic Investigation of Olefins in Saturated Hydrocarbons and Self-Tuning Model Development

Based on systematized collection of Raman spectra of about 40 monounsaturated olefins, spectral patterns and invariant relations were established that formed the basis of the method for determining total olefins (total unsaturation per 100 carbon atoms) and their main classes in solutions of saturat...

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Bibliographic Details
Published in:Journal of applied spectroscopy 2019-05, Vol.86 (2), p.300-307
Main Authors: Kuptsov, A. Kh, Karchevskaya, O. G., Kron, T. E., Korneeva, G. A., Zhmaeva, E. V.
Format: Article
Language:English
Subjects:
Adsorption
Alkenes
Analysis
Analytical Chemistry
Atomic properties
Atomic/Molecular Structure and Spectra
Bonds (Securities)
Cables
Calibration
Carbon
Chromatography
Cost analysis
Fiber optic cables
Fiber optic equipment
Fiber optics
Hydrocarbons
Investigations
Iodine
Paraffins
Physics
Physics and Astronomy
Raman spectra
Raman spectroscopy
Remote control
Reproducibility
Self tuning
Spectroscopy
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Summary:Based on systematized collection of Raman spectra of about 40 monounsaturated olefins, spectral patterns and invariant relations were established that formed the basis of the method for determining total olefins (total unsaturation per 100 carbon atoms) and their main classes in solutions of saturated hydrocarbons. Self-tuning of the model by calculating the proportion of spectrally unresolvable C=C components using the intensity of conjugated methyl groups increased its accuracy. In terms of repeatability, speed and cost-effectiveness of the analysis, the Raman-method is superior to standard methods of gas and adsorption chromatography and other modern spectralcorrelation methods. The accuracy and stability of the results repeatability is confirmed by more than annual series of parallel comparisons with the data of known method. It is shown that five types of olefins in paraffin model solutions are sufficient to construct calibration curves in units of the number of C=C bonds per 100 carbon atoms. These units make it possible to transform the data to the iodine scale and unify the calibration model for different fractions regardless of the hydrocarbon chain length. The Raman technique can be extended to analyze other mixtures of nonaromatic hydrocarbons and be used for remote control of processes via fi ber optic cables in industrial production.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-019-00816-2