Theory and Practice of Linear Programmed-Temperature Gas Chromatography (LPTGC) in Relation to the Analysis of Coal-Tar Neutral Fractions

摘要

A study was made of chromatographic theory with a view to deriving equations in order to avoid an empirical approach towards the analysis of coal-tar fractions and to facilitate the optimum choice of relevant variables. The equations were useful in the more efficient practical application of linear programmed-temperature gas chromatography (LPTGC) in the analysis of coal-tar fractions for the purpose of characterizing the tars produced from BCRA test ovens. For a particular analysis, there was an optimum initial programming temperature and a maximum programming rate which for aromatic hydrocarbons was calculated from their boiling points. Under optimum conditions there was a linear relationship between the retention time and the boiling point, which was advantageous in simulated distillation and minimized the error of peak-area measurement. The conditions necessary to achieve this linearity were established.