Research progress on composition and structure of coal liquefied pitch
Coal liquefied pitch contains 50％heavy oil and asphaltic substance,mainly composed of polycyclic condensed aromatic hy-drocarbons,which are high-quality precursors for carbon materials.Mastering the composition and structural characteristics of coal liq-uefaction pitch will benefit the development of high-value-added products.This paper summarizes the research progress of composition structures and analysis methods of coal liquefied pitch.It is pointed out that the commonly used research methods are primarily elemen-tal analyzer,Fourier transform infrared(FTIR),nuclear magnetic resonance(NMR)spectroscopy,and other analysis techniques to ob-tain the structural parameters of the average molecules,and further to construct average molecular structure models to describe the chemical structure of pitch.These models reveal that the basic unit of coal liquefied pitch structure is polycyclic condensed aromatic hy-drocarbons linked to alkyl side chains containing heteroatoms.In recent years,the ultra-high resolution mass spectrometry(U-HRMS)has become a powerful tool for analyzing the molecular composition of complex mixtures and has been applied to selectively analyze the composition of polar compounds in pitch at the molecular level.It may become the main technique to analyze the composition and struc-ture of coal liquefied pitch in the future.
万方数据
维普
