Identification of alkyl carbazoles and alkyl benzocarbazoles in Brazilian petroleum derivatives

Carbozoles are important compounds in crude oils, as they may be used as geochemical tracers, being the major type of nitrogen compounds in petroleum. At the same time, they are regarded as undesirable due to the problems they may cause in the refining process, such as catalyst poisoning, corrosion,...

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Bibliographic Details
Published in:Journal of Chromatography A 2006-02, Vol.1105 (1), p.186-190
Main Authors: Oliveira, Eniz Conceição, Vaz de Campos, Maria Cecília, Rodrigues, Maria Regina Alves, Pérez, Valéria Flores, Melecchi, Maria Inês Soares, Vale, Maria Goreti Rodrigues, Zini, Cláudia Alcaraz, Caramão, Elina Bastos
Format: Article
Language:English
Subjects:
Alkyl carbazoles
Aluminum Oxide
Analytical chemistry
Applied sciences
Carbazoles - analysis
Carbazoles - isolation & purification
Chemical Fractionation - methods
Chemistry
Chlorides
Chromatographic methods and physical methods associated with chromatography
Crude oil, natural gas and petroleum products
Energy
Exact sciences and technology
Ferric Compounds
Fuels
Gas chromatographic methods
Gas Chromatography-Mass Spectrometry - methods
GC/MS
Nitrogen compounds
Petroleum
Petroleum - analysis
Prospecting and production of crude oil, natural gas, oil shales and tar sands
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Summary:Carbozoles are important compounds in crude oils, as they may be used as geochemical tracers, being the major type of nitrogen compounds in petroleum. At the same time, they are regarded as undesirable due to the problems they may cause in the refining process, such as catalyst poisoning, corrosion, gum or color formation in final products. As separation and identification of carbazoles are challenging goals, this work presents a chromatographic method, made of a pre-fractionation on neutral alumina followed by the separation and identification of two classes of carbazoles using FeCl 3/Chromossorb W and gas chromatograph with mass spectrometer (GC/MS) (SIM—single ion monitoring mode) analysis. For the first time, a series of alkyl carbazoles and alkyl benzocarbazoles were identified in heavy gas oil (HGO) and atmospheric residue of distillation (ARD) obtained from Brazilian petroleum.
ISSN:0021-9673
DOI:10.1016/j.chroma.2005.11.001