Health & Environmental Research Online (HERO)


Print Feedback Export to File
7754150 
Journal Article 
Structural Analysis of Primary Coal Tar by FD-MS 
Hata, Y; Hayashizaki, H; Takahashi, T; Kanehashi, K 
2019 
1 
Tetsu-To-Hagane / Journal of the Iron and Steel Institute of Japan
ISSN: 0021-1575 
Iron and Steel Institute of Japan 
105 
6 
601-609 
Japanese 
WOS:000471736500004 
Understanding chemical structure of primary coal tar is substantially important to promote advanced application and utilization of coal where chemical reaction plays a key role. Mass spectrometry allows us to characterize complex mixture like coal tar pitch, coal extractions, and heavy oil. In the present study, two kinds of primary coal tar A and B were prepared from different types of coal A (bituminous coal) and B (subbituminous coal). The main components such as Hexane Soluble (HS) and Hexane Insoluble-Toluene Soluble (HI-TS) fractions obtained by extraction of each tar were measured by Field Desorption Mass Spectrometry (FD-MS) to determine their constituent chemical structures. 1H NMR spectra of HS and HI-TS were measured to confrm the reliability of proportion of hydrogen types that have been determined by FDMS. As a result, both of the proportions in HS fractions were found to be almost consistent, while those in HI-TS fractions were not consistent because they have more complex chemical components than HS fractions. Based on the combined analysis of FD-MS and NMR, we concluded that the HS in primary coal tar A mainly consists of polycyclic aromatic hydrocarbons (PAHs) and aliphatic structures including aromatic carbons, while the HS in primary coal tar B mainly consists of aliphatic structures. These results suggest that determining chemical structures and their ratios only from FD-MS spectra is useful to concretely clarify difference between some types of primary coal tar. © 2019 Iron and Steel Institute of Japan. All rights reserved. 
coal; primary coal tar; extraction; MS; FD-MS; H-1 NMR