Method for quantitatively determining the amount of saturates, olefins, and aromatics in a mixture thereof
Patent 5190882 Issued on March 2, 1993. Estimated Expiration Date: 
January 6, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 6, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAnalytical method of hydrocarbon compounds Liquid chromatographic separation of hydrocarbons Method for spectroscopic analysis of hydrocarbons Patent #: 4988446 InventorsAssigneeApplicationNo. 817217 filed on 01/06/1992US Classes:436/139, HYDROCARBON73/61.53, Column detail73/61.58, Detector detail210/656, Chromatography436/140, Aromatic436/141, Acyclic (e.g., methane, octane, isoparaffin, etc.)436/142, Unsaturated (e.g., ethylene, diene, etc.)436/143, Total hydrocarbon, flammability, combustibility (e.g., air-fuel mixture, etc.)436/161, INCLUDING CHROMATOGRAPHY436/171, Spectrum analysis (e.g., flame photometry, etc.)436/173NUCLEAR MAGNETIC RESONANCE, ELECTRON SPIN RESONANCE OR OTHER SPIN EFFECTS OR MASS SPECTROMETRYExaminersPrimary: Housel, James C.Assistant: Snay, Jeffrey Attorney, Agent or FirmInternational ClassG01N 021/33AbstractA 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.Other References
Field of SearchHYDROCARBONAromatic Acyclic (e.g., methane, octane, isoparaffin, etc.) Unsaturated (e.g., ethylene, diene, etc.) Total hydrocarbon, flammability, combustibility (e.g., air-fuel mixture, etc.) INCLUDING CHROMATOGRAPHY Spectrum analysis (e.g., flame photometry, etc.) Including use of a solid sorbent, semipermeable membrane, or liquid extraction NUCLEAR MAGNETIC RESONANCE, ELECTRON SPIN RESONANCE OR OTHER SPIN EFFECTS OR MASS SPECTROMETRY Chromatography Chromatography |
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