Qualitative and quantitative analysis of refined F–T wax on GC–MS and GC

• Published in: Fuel (Guildford) 2023-01, Vol.332, p.126031, Article 126031
• Main Authors: Cheng, Songpeng, An, Liangcheng, Li, Zhenling, Liu, Suli, Lv, Junmin, Fan, Subing, Zhao, Tiansheng
• Format: Article
• Language: English
• Subjects: Cracking products; GC–MS; Qualitative; Quantitative; Refined F-T wax
• ISSN: 0016-2361
• DOI: 10.1016/j.fuel.2022.126031

[Display omitted] •The method on GC–MS is suitable for qualitative and quantitative analysis of refined F-T wax which carbon number is in C7 ∼ C38.•Influences on resolution from temperature program, column flow, injection volume and split ratio were studied in detail.•The optimized parameters on GC–MS can be applied on GC for the more convenient analysis demands.•The method is suitable for analysis of cracking products from refined F-T wax. The products with higher carbon numbers from Fischer-Tropsch (F-T) synthesis are very complex and hard to directly be analyzed on GC due to their very high boiling point. In this work, the qualitative and quantitative analytical method for refined F-T wax samples with C7 to C38 was established on GC–MS. All components were well separated, qualified and quantified. The analytical errors were less than ±2 % and the errors of recovery experiments were less than ±5 %. Thereafter, this method was successfully applied in GC analysis with errors less than ±0.75 % and the analytical method on GC was also built, which will provide a more convenience way in analysis of refined F-T wax samples. Based on the obtained analytical conditions and the relative calibration factors of paraffins, the qualitative and quantitative method for the cracking products from refined F-T wax was further built according to a similar method by using simulated samples with the conversion from 5 % to 80 %. The thermal cracking of F-T wax 5# was performed and the content of LAOs in liquid mixtures reached over 50 % at 650 °C. This study simplifies the previous analysis methods which can only be completed by using a variety of standard methods and provide convenience for analysis of refined F-T wax from coal-to-liquid plant.