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, 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.
Oliveira
Eniz Conceição
EC
Center III, UNIVATES, Lajeado, RS, Brazil.
Vaz de Campos
Maria Cecília
MC
Rodrigues
Maria Regina Alves
MR
Pérez
Valéria Flores
VF
Melecchi
Maria Inês Soares
MI
Vale
Maria Goreti Rodrigues
MG
Zini
Cláudia Alcaraz
CA
Caramão
Elina Bastos
EB
D000537:Aluminum Oxide; D002227:Carbazoles / Q000032:analysis* / Q000302:isolation & purification; D005591:Chemical Fractionation / Q000379:methods; D002712:Chlorides; D005290:Ferric Compounds; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D010578:Petroleum / Q000032:analysis*
D002227:Carbazoles; D002712:Chlorides; D005290:Ferric Compounds; D010578:Petroleum; D000537:Aluminum Oxide; C024555:ferric chloride