Comprehensive two-dimensional gas chromatography for the analysis of Fischer-Tropsch oil products |
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Authors: | van der Westhuizen Rina Crous Renier de Villiers André Sandra Pat |
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Affiliation: | Sasol Technology R&D, PO Box 1183, Sasolburg 1183, South Africa. |
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Abstract: | The Fischer-Tropsch (FT) process involves a series of catalysed reactions of carbon monoxide and hydrogen, originating from coal, natural gas or biomass, leading to a variety of synthetic chemicals and fuels. The benefits of comprehensive two-dimensional gas chromatography (GC×GC) compared to one-dimensional GC (1D-GC) for the detailed investigation of the oil products of low and high temperature FT processes are presented. GC×GC provides more accurate quantitative data to construct Anderson-Schultz-Flory (ASF) selectivity models that correlate the FT product distribution with reaction variables. On the other hand, the high peak capacity and sensitivity of GC×GC allow the detailed study of components present at trace level. Analyses of the aromatic and oxygenated fractions of a high temperature FT (HT-FT) process are presented. GC×GC data have been used to optimise or tune the HT-FT process by using a lab-scale micro-FT-reactor. |
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Keywords: | One-dimensional GC Comprehensive two-dimensional GC Fischer–Tropsch oils Anderson–Schultz–Flory selectivity model Trace analysis |
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