Reaction kinetics of Shengli brown coal liquefaction at initial stage

To investigate the reaction kinetics of Shengli brown coal liquefaction at initial stage,experiments were carried out using a micro-autoclave with a very rapidly heating and cooling system.The study of reaction kinetics liquefaction of at initial stage were investigated according to the parameters.Although the heating time is short,partial coal is already converted when the autoclave reaches the reaction temperature.The conversion ratio is 28.12% at 440 ℃ with a residence time of 0.At lower temperature,Shengli brown coal is solely pyrolyzed,and there is less conversion at initial stage.The conversion is 28% with a 10 min holding time at 380 ℃ and it is almost constant.With the temperature increasing,the conversion ratio,oil and water yield,and gas yield rise,and the increasing rate is higher at initial 10 min,and the trend postpones at late 10-25 min,because the asphaltenes as intermediates are hardly converted to oil fraction.