Soft Asphalt For The Preparation Of Order Of Mesophase Coke

Study on the orderly growth of mesophase coke is the key techniques to develop the needle coke,carbon fibre as well as new carbon materials. Thermal conversion of SOP coal tar pitch to mesophase and ordered mesophase pitch coke was carried out in a multi-tube, well-crucible with programmable temperature control. The courses of thermal polymerization of material to mesophase were continuous observed by high temperature microscope. The mechanism of mesophase liquid crystal to form fiber was studied.The preparation of mesophase concludes the nuclear appearance of mesophase micro-crystal,the growth of mesophase micro-crystal and spheres, as well as the coalescence of mesophase spheres. Along with the increasing of the reaction temperature, the growth rate of mesophase spheres rises up, and the coalescence of mesophase spheres will be ahead of schedule.. In addition, the formation of mesophase coke will be more perfect with the longer reaction time. So, the fitting reaction temperature and time is very important.On the thermodynamics side, the thermal polymerization of coal tar pitch forming mesophase pitch is a spontaneous process, though the ordered growth of mesophase coke is not a spontaneous process, which need function of outside force.The effect of the single flow of pyrolysis gaseous is significant to the ordered growth of mesophase coke. The thermal polymerization of coal tar pitch was carried out in a novel tubular reactor reducing in the central section which contained pneumatic guide structure. The ordered growth of mesophase was guided by the oriented flowing gas stream of reaction tubular to form ordered mesophase coke. Moreover, study on the change with the structure, properties of samples with different treatment conditions is carried out.The fore-mentioned study provides a scientific and technique basis for the further application of coal tar pitch, as well as preparation industrialization of high quality needle coke.