Gas chromatography-mass spectrometry study of coal-derived asphaltenes : II. Carbazole-type neutral nitrogen compounds

✍ Scribed by Maja Stefanova; Lazarin Lazarov

• Book ID: 104144686
• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 649 KB
• Volume: 446
• Category: Article
• ISSN: 1873-3778
• DOI: 10.1016/s0021-9673(00)94445-5

✦ Synopsis

An approach to the selective determination of carbazole-type neutral nitrogen compounds is suggested. Carbazoles, benzocarbazoles and their alkyl derivatives were obtained as homogeneous fractions after extensive chromatographic separation. The number and the position of alkyl substituents were determined by 'H NMR and mass spectrometry.

The following homologous series were found in coal liquefaction asphaltenes:

Z(N) = -15, Ci2-Ci8; -17, Ci,, Cis, CzO; -19, Cl4 and -21, C1&20.

The content of carbazole and its alkyl derivatives was one order of magnitude larger than that of other series.