The variation of composition and structure of heavy components of medium and low temperature coal tar under different initial hydrogen pressures
Heavy components such as asphaltenes have a great influence on the hydrogenation conversion of medium-low temperature coal tar.In order to clarify the composition and structure of heavy components during the hydrogenation process of medium-low temperature coal tar,an improved four-component separation method was used to investigate the hydrogenation conversion of heavy components of coal tar under different hydrogen initial pressures from the perspectives of component content,heteroatom distribution and evolution mechanism of polar functional groups.The results showed that with the increase of hydrogen initial pressure,the component content,relative molecular mass and heteroatom content,hydrogen bond functional group and C—O group content of asphaltene and resin decreased and the molar ratio of H to C increased gradually.Compared with resins,asphaltenes had higher heteroatom content and more complex surface heteroatoms to remove difficultly.In addition,the content and distribution of characteristic functional groups in heavy components prove that hydrogen bonds and acid-base interactions caused by heteroatoms are the main forces for the association of heavy components in coal tar.
heavy componenthydrogen initial pressurecomposition structurehydroconversion
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