Rathbun Wayne
UOP LLC, 25 E. Algonquin Rd., Des Plaines, IL 60017-5017, USA.
J Chromatogr Sci. 2007 Nov-Dec;45(10):636-42. doi: 10.1093/chromsci/45.10.636.
A method is described for automating the regulation of cold jet flow of a comprehensive two-dimensional gas chromatograph (GCxGC) configured with flame ionization detection. This new capability enables the routine automated separation, identification, and quantitation of hydrocarbon types in petroleum fractions extending into the vacuum gas oil (VGO) range (IBP-540 degrees C). Chromatographic data acquisition software is programmed to precisely change the rate of flow from the cold jet of a nitrogen cooled loop modulator of a GCxGC instrument during sample analysis. This provides for the proper modulation of sample compounds across a wider boiling range. The boiling point distribution of the GCxGC separation is shown to be consistent with high temperature simulated distillation results indicating recovery of higher boiling semi-volatile VGO sample components. GCxGC configured with time-of-flight mass spectrometry is used to determine the molecular identity of individual sample components and boundaries of different molecular types.
描述了一种用于自动调节配置有火焰离子化检测的全二维气相色谱仪（GCxGC）冷喷射流的方法。这项新功能能够对延伸至减压瓦斯油（VGO）范围（初沸点 - 540℃）的石油馏分中的烃类进行常规自动分离、鉴定和定量分析。色谱数据采集软件经过编程，可在样品分析过程中精确改变GCxGC仪器的氮气冷却环调制器冷喷射流的流速。这使得能够在更宽的沸点范围内对样品化合物进行适当调制。结果表明，GCxGC分离的沸点分布与高温模拟蒸馏结果一致，表明回收了较高沸点的半挥发性VGO样品成分。配置了飞行时间质谱仪的GCxGC用于确定各个样品成分的分子身份以及不同分子类型的界限。
