Method of producing molecular profiles of isoparaffins by low emitter current field ionization mass spectrometry
AssigneeExxonMobil Research and Engineering Company
InventorsChang Hsu, Gary Dechert, Haven Aldrich, Gerald Dupre
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Abstract
The present invention is devoted to an analytical method for directly determining carbon number and molecular weight distributions of isoparaffin mixtures. The analytical means uses low in-scan emitter-current field-ionization mass spectroscopy to substantially reduced or eliminated molecular ion fragmentation for isoparaffins, which allows direct measurement of isoparaffin molecular ions for their distributions. The analytical means is capable of directly characterizing isobutane to C50+ isoparaffins, covering naphtha to gas oil ranges.
Claims9
A method for measuring carbon numbers and molecular weights of isoparaffins using a field ionization mass spectrometer that comprises reducing an in-scan emitter current in the field ionization mass spectrometer below a threshold value to substantially reduce fragmentation of isoparaffin molecular ions.
Dependencies are inferred from the claim text.