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Ion-exchange resins in the isolation of nitrogen compounds from petroleum residues.

Authors
  • Conceição Oliveira, Eniz
  • Vaz de Campos, Maria Cecília
  • Sant'Ana Lopes, Aline
  • Rodrigues Vale, Maria Goreti
  • Bastos Caramão, Elina
Type
Published Article
Journal
Journal of Chromatography A
Publisher
Elsevier
Publication Date
Feb 20, 2004
Volume
1027
Issue
1-2
Pages
171–177
Identifiers
PMID: 14971500
Source
Medline
License
Unknown

Abstract

In this work, preparative liquid chromatography was used for the separation of the nitrogen compounds in a sample of heavy gas oil from a Brazilian petroleum. Initially it took place a pre-fractionation by neutral aluminium oxide and the compounds were separated in different classes such as: hydrocarbons, resins (compounds of low molecular mass and intermediate polarity) and asphalthenes (polar compounds with high molecular mass). A comparison of the fraction of resins was performed by re-fractionating with modified silica (with potassium hydroxide and hydrochloric acid), or with ion exchange resins (Amberlyst A-27 and A-15), being isolated the basic and neutral compounds, that were analyzed by GC-MS in the scan and selected ion monitoring modes. Quinolines, benzoquinolines, tetrahydroquinolines were found in the basic fraction and carbazoles derivatives were found in the neutral fraction.

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