Study On Depolymerization And Hydrogenation Of Dicyclopentadiene

This thesis optimized two reactions of the depolymerization of dicyclopentadiene to cyclopentadiene and the catalytic hydrogenation of cyclopentadiene to cyclopentene through using dicyclopentadiene in the pyrolysis C5 as raw material and using gas chromatography as quantitative analysis tool.This thesis established the kinetic equation of the selective hydrogenation of cyclopentadiene.The effects of reaction temperature,residence time,reflux ratio and polymerization inhibitor on the depolymerization and distillation of dicyclopentadiene were investigated.Both the depolymerization conversion rate and the yield improved with the increase of temperature and residence time.The purity of the cyclopentadiene improved with the increase of reflux ratio while the yield decreased.The polymerization inhibitor could effectively inhibit the polymerization reaction during the depolymerization process.The optimized operating conditions are as follows:depolymerization temperature 178℃～180℃,residence time 4h～4.5 h,reflux ratio 0.5～1.In addition,this thesis used Aspen Plus to simulate the rectification of the recovery and utilization of N-dodecane.The effects of heating temperature,reaction pressure,n(H2)/n(CPD)and LHSV on the catalytic hydrogenation of cyclopentadiene were investigated.The hydrogenation conversion rate improved with the increase of temperature,pressure and n(H2)/n(CPD)while the selectivity of cyclopentene decreased.Increasing the LHSV could reduce the conversion rate and increase the selectivity of cyclopentene.The optimized operating conditions are as follows:hydrogenation temperature 55℃～60℃,hydrogenation pressure 1.95 MPa～2.05MPa,n(H2)/n(CPD)1.3～1.4,LHSV 4 h-1～5 h-1.This thesis further studied the macro kinetics of the selective hydrogenation of cyclopentadiene based on a certain Ni catalyst and obtained model parameters through using UGO1 algorithm of First Optimization software.The kinetic equation obtained was r=1.3328e-2.2365×104/RT y2.0049Z0.2270P2.0503.Through model test analysis,the results showed that the kinetic equation was reliable and had certain application value.