Determination of oxygenates in syngas-to-olefin products by solid phase extraction combined with gas chromatography-mass spectrometry

Se pu = Chinese journal of chromatography
Junyan LiuSongyuan Gu

Abstract

The syngas-to-olefin (SGTO) products mainly consist of hydrocarbons along with small amounts of oxygenates as the byproducts. A C18 solid-phase extraction (SPE) column was used for oxygenates enrichment in SGTO products. As the hydrophobic compounds, the hydrocarbons had stronger interaction with a C18 SPE column than oxygenates. Under the optimized elution conditions, the oxygenates were first eluted from the C18 SPE column with 60% (v/v) methanol solution. The fraction of oxygenates was then analyzed with gas chromatography-mass spectrometry (GC-MS) for qualification and gas chromatography-hydrogen flame ionization detection (GC-FID) for quantification. The FID response factors of n-alkanol and n-ketone were used for alkanols and ketones quantitative calculation and the method recoveries were 88%-98% and 64%-87% respectively. In the range of 197-4,785 mg/L, good linear relationships of the FID responses with the corresponding mass concentrations of the standard samples were obtained with the linear regression coefficients greater than 0.99. Sixty-seven oxygenates were analyzed qualitatively and quantitatively. The results showed that the fraction of the oxygenates mainly consists of alkanols and ketones. The total content of ...Continue Reading

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