Study on the Influence of Coupling Polycondensation of Coal Liquefaction Residue and Biomass to Produce Carbon Materials

Abstract The coal liquefaction residue has been extensively used in the synthesis of various carbon materials. They still exist low density and strength. To improve these properties, a method of preparing high density and strength carbon materials by coupling coal liquefaction residue with biomass is proposed. Three kinds of biomass are added to the coal liquefaction residue, to attain the purpose of preparing carbon materials. The results show that different biomasses have a greater impact on the pyrolysis of coal liquefaction residue, and there is a synergistic effect between both. The maximum pyrolysis rate shifts to the low temperature segment. The different biomass can promote the increase of coal liquefaction residue polymerization yield, and the maximum growth rate is 7.52% compared with single pyrolysis. The density of carbides made from diverse biomass and coal liquefaction residues have increased significantly, the structure is denser, the whole is “rock”, and the maximum density is 1.98 g/cm 3 , which has reached the industrial metallurgical coke standard. The microcrystalline structure of carbides is arranged regularly and tends to graphitization. The different biomass can narrow the sulfur content of polymers and carbides, and the minimum sulfur content is 1.33%.