Li Haijing, Liu Guozhu, Zhang Xiangwen
Key Laboratory of Green Chemical Technology of Ministry of Education, Tianjin University, Tianjin 300072, China.
Se Pu. 2018 Aug 8;36(8):780-785. doi: 10.3724/SP.J.1123.2018.02030.
Hydrocarbon fuels are mainly composed of -alkenes, iso-alkanes, cycloalkanes (primarily single-and double-ring), alkylbenzenes, indans, tetralins, naphthalene, and alkylnaphthalenes. Different hydrocarbon classes impart different properties to a fuel. An identification method of hydrocarbon classes in kerosene-based endothermic hydrocarbon fuel was established using comprehensive two-dimensional gas chromatography coupled to mass spectrometry (GC×GC-MS). Moreover, the corresponding quantitative determination was achieved using the effective carbon number correction factors of GC×GC-FID. The effects of the main chromatographic conditions such as the column system, program heating conditions, and modulation period on the separation of fuels were discussed. Nine hydrocarbon fuels were analyzed. The results showed that the contents of paraffin and cycloalkanes are consistent with the results obtained using the standard test method ASTM D2425. The relative error is within ±10%. The carbon content calculated using this method has an error of less than 0.5% compared with the elemental analysis method. This method does not require complicated pretreatment, and the sample can be injected directly after dilution. Compared with the traditional GC-MS, the operation is simple, and the differences among various samples can be observed intuitively, which helps in improving the performance of the fuel.
烃类燃料主要由烯烃、异链烷、环烷烃（主要是单环和双环）、烷基苯、茚满、四氢化萘、萘以及烷基萘组成。不同的烃类赋予燃料不同的性质。利用全二维气相色谱-质谱联用仪（GC×GC-MS）建立了一种煤油基吸热型烃类燃料中烃类的鉴定方法。此外，通过GC×GC-FID的有效碳数校正因子实现了相应的定量测定。讨论了柱系统、程序升温条件和调制周期等主要色谱条件对燃料分离的影响。对9种烃类燃料进行了分析。结果表明，石蜡和环烷烃的含量与采用标准试验方法ASTM D2425得到的结果一致。相对误差在±10%以内。与元素分析法相比，该方法计算得到的碳含量误差小于0.5%。该方法无需复杂的预处理，样品稀释后可直接进样。与传统的GC-MS相比，操作简便，能直观地观察到不同样品之间的差异，有助于提高燃料性能。
