Abstract
In this paper nearly 100 components in five kinds of coal liquids were identified or determined by Pyrolysis-GC/MS, HPLC, and Fluorescence. The five coal liquids were from short time contact liquefaction (L1), slow pyrolysis (L2, i.e. coal tar), liquefaction (L3), fast pyrolysis (L4), and fast pyrolysis of coal after pretreatment with tetralin (L5). By pyrolysis-GC/MS, more than fifty components were investigated in L4 and L5. L1, L2 and L3 were pre-separated by column chromatographic methods. The separated fractions were further analyzed by HPLC and fluorescence spectroscopy. As a result, more than fifty components were identified and twenty components were measured quantitatively in the fractions. The differences between different separation and analysis methods and the effects of the processing conditions such as temperature and pretreatment were discussed. The research and development of coal liquefaction technology provides a promising perspective for use of coal. In order to effectively evaluate and improve their liquefaction technology, coal chemists must manage to obtain accurate and detailed information about constitution and structure of coal-derived liquids.
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