CHARACTERIZATION OF BIODIESEL FEEDSTOCK AND ITS HYDROGENATION PRODUCTS USING COMPREHENSIVE TWO-DIMENSIONAL GAS CHROMATOGRAPHY–TIME-OF-FLIGHT MASS SPECTROMETRY

Abstract

Abstract: Based on a comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry system, a molecular structure characterization method for biodiesel (mainly composed of fatty acid methyl esters) and its two-stage hydrogenation products was established, enabling comprehensive qualitative analysis of biodiesel and its hydrogenation products. Based on this analysis, combined with the hydrogenation reaction mechanism, further interpretation was conducted to accurately identify the types of hydrocarbon compounds, fatty acid methyl esters, carboxylic acids, alcohols, and other compounds in biodiesel and its hydrogenation products. The results showed that biodiesel is mainly composed of C₁₃—C₁₈ fatty acid methyl esters, with a total mass fraction of over 95%, predominantly unsaturated fatty acid methyl esters; the products from the first hydrogenation treatment are mainly composed of saturated fatty acid methyl esters, predominantly palmitic acid methyl ester and stearic acid methyl ester; on this basis, the products from the second hydrogenation treatment are mainly composed of n-paraffins, with a mass fraction of over 90%.

Key words: comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry, fatty acid methyl ester, hydrogenation product, biodiesel

References

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