Liquid purification or separation – Processes – Chromatography
Patent
1993-03-04
1994-09-13
Therkorn, Ernest G.
Liquid purification or separation
Processes
Chromatography
210656, 2101982, 436161, 585825, B01D 1508
Patent
active
053466225
ABSTRACT:
Methods of separating and classifying the relative amounts of two or more classes of hydrocarbon molecules in a sample are disclosed wherein an input stream comprising a mobile phase and the sample is injected into a chromatographic column, and an effluent stream exiting a chromatographic column is split into a first effluent stream and a second effluent stream. The mass of carbon in each of the classes of hydrocarbons in the first effluent stream is determined, preferably using a flame ionization detector, and the second effluent stream is directed through a variable restrictor, allowing the pressure and mass flow rate of the input stream to be independently controlled and improved results obtained. In a preferred embodiment the present invention also includes identifying the hydrocarbon molecules in the second effluent stream in order to verify the analysis or provide additional data, preferably by using an ultraviolet detector. The present invention is most preferably used to analyze the aromatic hydrocarbons in a sample of diesel fuel.
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Standard Test Method for Determination of Aromatic Content of Diesel Fuels by Supercritical Fluid Chromatography, Designation: D 5186-91, Annual Book of ASTM Standards, vol. 05.01, published Dec. 1991, pp. 855-857.
Klee Matthew S.
Wang Mu Z.
Hewlett--Packard Company
Schuette Richard F.
Therkorn Ernest G.
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