Engineering Research Equipment Grant: Advanced Gas Chromatography System with Multidimensional Capabilities

分离的复杂分析问题 类燃料氧化的中间体和产物 碳氢化合物需要复杂的色谱技术。 提供这些功能的两种互补方法 是毛细管柱和计算机控制的程序 瓣膜转换，也称为多维或“心脏 切割”分析。 而毛细管柱本身 提供比填充柱更高的分辨率，它们具有 不足以分离非常复杂的混合物， 烷烃、烯烃和含氧化合物。 因此，为了实现 分离时，通常需要使用多个色谱柱 其在一个周期内被切换到载气流中或从载气流中切换出来， 分析. 进一步的分离往往是通过持有 在柱中的气体样品的选定部分，以及 将该部分样品反冲洗到第二分析装置中， 柱 这种技术被称为“多维”气体 层析 指定的系统将允许 采用先进的分离技术， 需要为几个正在进行的研究项目， 燃烧和燃料研究小组。 一种增强的气相色谱鉴定/分析系统 要求更换和升级现有能力， 研究燃烧过程和发动机， 燃料技术领域。 建议的系统允许多- 尺寸分析能力，这是必不可少的， 分析更多的类似燃料的含碳碳氢化合物 大于或等于5的数字。

The complex analytical problems of separating the intermediates and products from the oxidation of fuel-like hydrocarbons require sophisticated chromatographic techniques. Two complementary methodologies to provide these capabilities are capillary columns and computer controlled, programmed valve switching, also called multi-dimensional or "heart cutting" analysis. While capillary columns by themselves provide increased resolution over packed columns, they have not been sufficient to separate very complicated mixtures of alkanes, olefins, and oxygenates. Therefore to achieve separation, it is often necessary to use multiple columns which are switched into and out of the carrier flow during an analysis. Further separation is often achieved by holding selected fractions of the gas sample in a column and backflushing this partial sample into a second analytical column. This technique is called "multi-dimensional" gas chromatography. The system specified will allow implementation of sophisticated separation techniques, which are required for several ongoing research projects of the Combustion and Fuels Research Group. An enhanced gas chromatography identification/analysis system is requested to replace and upgrade existing capabilities for conducting research in the combustion processes and engine and fuels technology areas. The proposed system allows multi- dimensional analysis capabilities, which are essential in the analysis of more fuel-like hydrocarbons which have carbon numbers greater than or equal to five.