Study on the liquefaction kinetics of Shenhua coal at initial stage
Abstract：In order to research liquefaction kinetics of Shenhua coal at initial stage,the direct liquefaction of Shenhua coal was carried out in a 180 mL stirring autoclave using “863” catalyst and coal derived recycle solvent.A traditional lumped kinetic model was used in this study.Accordingly,the coal sample was classified into fast converting part,slow converting part and inert part.Activation energy (Ea) of each first order reaction was calculated.Results show that the total reaction Ea of fast converting part is 279.74 kJ/mol,that of slow converted part to pre-asphaltenes and asphaltenes is 57.80 kJ/mol.In the first 4 minutes of reaction,the conversion rate and yield of preasphaltenes increase sharply,and in the sequent 4-15 minutes,the yield of PAA is approximately constant or slightly declines,meanwhile the oil yield gradually increases in the whole reaction.In addition,the research also suggests that the dissolved hydrogen demonstrates more important on production of hydrogen free-radicals when the conversion is more than 55％.
Keywords：coal liquefactionreaction kineticsinitial stageconversion rateactivation energy
Publication Date：2017-01-01