Method for quantitatively determining the amount of saturates, o

Details Method for quantitatively determining the amount of saturates, o Method for quantitatively determining the amount of saturates, o

1992-01-06

1993-03-02

Housel, James C.

Chemistry: analytical and immunological testing

Hydrocarbon

436140, 436141, 436142, 436143, 436161, 436171, 436173, 210656, 73 6153, 73 6158, G01N 2133

Patent

active

051908824

ABSTRACT:
A quantitative method including separating a mixture of olefins, aromatics, and saturates by supercritical fluid chromatography to obtain an eluent stream that over a first time period contains a mixture of olefins and saturates, and over a second time period contains aromatics, and passing the eluent first to an ultraviolet absorption detector (UV). Importantly, the eluent is irradiated in the UV detector at a wavelength capable of producing an ultraviolet absorbance response of olefins that is independent of specific olefins present, and preferably is substantially similar to a mass detector response for olefins. From a combination of UV and mass response, the mass of the olefins in the mixture of olefins and saturates can be determined. Thereafter, the eluent is passed to a mass detector whereby the mass of the mixture of saturates and olefins is determined and then the mass of the aromatics is determined.

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