Construction of Coal Asphalt Fingerprint Based on Chromatography

KeyWord:coal tar pitch  fingerprint  gas chromatography-mass spectrometry(GC-MS)  pyrolysis  high-performance liquid chromatography(HPLC)

Abstract:

      he composition of coal pitch is extremely complex,which contains polycyclic aromatic hydrocarbons with large molecular weight and their oxidation products.The coal pitch obtained from different coal raw material sources and production processes vary greatly in terms of aromatization degree,composition,property,molecular structure,etc.In this paper,gas chromatography mass spectrometry(GC-MS),pyrolysis/gas chromatography mass spectrometry(Py/GC-MS) and high performance liquid chromatography(HPLC) were used to develop a universal,stable and simple analytical method for the construction of coal asphalt fingerprint library.In the development of GC-MS method,the HP-5MS column was used,and the method was established under a linear temperature gradient.A chromatogram for 33 components was obtain by this method,which had good stability for different samples.The Py/GC-MS method was used to investigate the changes in component structure and composition at higher temperatures,which may be used for a reference for the processing and aging research of asphalt products.In the development of the HPLC method,the most commonly used C18 column reversed phase chromatographic separation mode was adopted,which was established with methanol and water as mobile phases under linear gradient conditions.The developed method could be used to obtain stable chromatographic peaks for 41 components in different samples.Based on the methods above,a fingerprint spectrum library for coal pitch could be established,which provides theoretical basis data for further improving the evaluation on coal pitch and developing new uses of coal pitch.