METHOD OF DETERMINING CONTENT OF OLEFINS IN SYNTHETIC LIQUID HYDROCARBONS OBTAINED VIA FISCHER-TROPSCH METHOD (VERSIONS) Russian patent published in 2016 - IPC G01N30/02 

FIELD: measurement technology.

SUBSTANCE: invention relates to organic synthesis, namely to non-destructive methods of determining content of olefins in synthetic liquid hydrocarbons by means of Raman scattering. Proposed method consists in the calibration dependence of concentration of alpha-, mixture of trans-2- and trans-3-isomers of olefins and a mixture of cis-2- and cis-3-olefins from the Raman scattering spectrum, which is a ratio of Raman scattering spectrum band valence oscillations double carbon bonds of each of said types of olefins to area of the Raman scattering spectrum band of deformation or valence oscillations methane, methyl and methylene groups in the form of straight line. Raman scattering spectrum of the analysed sample synthetic liquid hydrocarbons and a range of valence oscillations double carbon bonds and range of deformation or valence oscillations methane, methyl and methylene groups. Range of valence oscillations double carbon bonds is divided by mathematical decomposition into three standard spectrum corresponding to alpha-, mixture of cis-2- and cis-3-olefins and common spectrum trans-2- and trans-3-isomers of olefins, after which the area of the strip of each of the obtained spectra is divided into area of spectrum band of deformation or valence oscillations methane, methyl and methylene groups. Derived values Raman spectrum is used to determine content of alpha-, mixture of cis-2- and cis-3-olefins and a mixture of trans-2-and trans-3-isomers of olefins in the analysed synthetic liquid hydrocarbons by insert into the corresponding calibration dependence. Total content of olefins is determined by summation of the obtained values.

EFFECT: high accuracy of determining content of olefins in synthetic liquid hydrocarbons obtained by Fischer-Tropsch synthesis.

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