Abstract
Boiling point distribution may be determined from gas-chromatographic data on petroleum products. Such a method has been termed "simulated distillation" [1]. It consists of a chromatographic separation of the petroleum product in a column with a nonpolar liquid phase and programmed temperature. Under these conditions, all hydrocarbons are eluted from the column in strictly increasing order of boiling point, regardless of class. A calibration curve is plotted relating the boiling point of the component to its exit temperature. This is done by analyzing a model mixture of hydrocarbons with known boiling points. Then, with exactly the same conditions of experiment, an unknown mixture is analyzed, recording the exit temperatures of the components. The boiling points of the components are determined from the calibration curve, and the quantities from the chromatogram. These data are used to plot a TBP curve. The temperature programming makes it feasible to analyze in a comparatively short time either crude oils or wide-cut petroleum products. For example, in [2], a TBP distillation curve was plotted from the data of a gas-chromatographic analysis for a :kerosine-gas oil fraction. In other papers [3, 4], data are presented on the analysis of petroleum cuts with 550"C end point.
Published Version
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