Direct determination of acid distributions in crudes and...

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G01N 27/62 (2006.01) G01N 33/28 (2006.01) H01J 49/26 (2006.01)

Patent

CA 2428901

A method for the direct determination of the acid distribution in petroleum crude oil and crude oil fractions by chlorine negative ion chemical ionization mass spectrometry is disclosed. The crude oil or crude oil fraction is introduced into a mass spectrometer followed by the introduction of a chlorinated reagent capable of producing chloride anions that can react with the acid compounds of the crude oil or crude oil fractions. The mass spectrometer is operated in negative ion mode to selectively detect negatively charged chlorinated adduct ion species. Mass spectra, such as represeted on Figure 3A, are obtained, from which adduct ions are selected. Peaks from resulting mass sub-spectra are identifed, from which the acid species are quantified, as demonstrated in Figure 3B.

L'invention concerne un procédé de détermination directe de la répartition des acides se trouvant dans du pétrole brut et dans des fractions de pétrole brut, faisant appel à la spectrométrie de masse par ionisation chimique d'ions chlores négatifs. On introduit dans un spectromètre de masse le pétrole brut ou la fraction de pétrole brut, puis on ajoute un réactif chloré pouvant produire des anions chlores, lesquels peuvent réagir avec les composés acides du pétrole brut ou des fractions de pétrole brut. Le spectromètre de masse fonctionne en mode ion négatif pour détecter de manière sélective les espèces d'ions d'addition chlorés chargés négativement. Un spectre de masse est obtenu, à partir duquel des ions d'addition sont sélectionnés. L'identification des pics provenant de chromatogrammes de masse permettent ainsi de quantifier les espèces d'acides.

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