Characterization of Volatiles in Coal Tar Pitch by Gas Chromatography/Mass Spectrometry and Atmospheric Pressure Solid Analysis Probe/Time of Flight-Mass Spectrometry

• Published in: Analytical letters 2015-04, Vol.48 (6), p.955-965
• Main Authors: Xie, Rui-Lun, Zong, Zhi-Min, Wang, Wan-Li, Yan, Hui-Long, Fan, Xing, Wei, Zhe-Hao, Mayyas, Mohannad, Wei, Xian-Yong
• Format: Article
• Language: English
• Subjects: Aromatic compounds; Atmospheric pressure; Atmospheric pressure solid analysis probe/time of flight-mass spectrometry; Barometric pressure; Coal tar; Coal tar pitch; Condensing; Gas chromatography; Gas chromatography/mass spectrometry; Mass spectrometry; Spectrometry; Spectroscopy; Volatiles
• ISSN: 0003-2719; 1532-236X
• DOI: 10.1080/00032719.2014.966378

Volatiles obtained by heating carbon disulfide-extractable portions from coal tar pitch were characterized by gas chromatography/mass spectrometry (GC/MS) and atmospheric pressure solid analysis probe/time of flight-mass spectrometry (ASAP/TOF-MS). The results show that the maximum yield of volatiles was obtained at temperatures from 200 to 300°C. In total, ninety-one compounds were identified by GC/MS, including fifty-eight condensed arenes, nineteen oxygen-containing compounds, thirteen nitrogen-containing compounds, and a sulfur-containing compound. The total relative content of the heteroatom-containing compounds decreased with rising temperature, whereas the content of the condensed arenes increased. According to ASAP/TOF-MS analysis, the molecular masses of the volatiles released at temperatures of 30 to 200°C, 200 to 300°C, and 300 to 410°C are between 110 and 260, 150 and 350, and 280 and 420 u, respectively. ASAP/TOF-MS was shown to be an effective tool for characterizing high-molecular weight species that are difficult to be determined by GC/MS analysis.