Kinetics Study On Dimerization Of C₅Fraction

The C5fraction is normally abtained from catalytic or thermal cracking, dehydrogenation and like of ethane device. With the rapid development of chemical industry, expecially of the ethene production, one of the main task turned to utilize cracking C5fraction effectively.The intrinsic kinetics of thermal dimerization of C5fraction was studied in this paper. Strirring speed was the key parameter to investigate the effect on the external diffusion on the dimeraization. Five different strirring speeds were investigated of200r/min,400r/min,600r/min,700r/min and800r/min. After ruled out the influence factors of the external diffusion on the dimeraization at the speed of700r/min, kinetics datas were collected with the reaction condition of40℃to100℃,0-10hour,1.5MPa and700r/min. Parameters of the intrinsic kinetics model were solved and optimized by the weighted least squares method based on the experimental data. The insrinsic linetics model was proved to be adequate from the static inspection, which could approximately describe the reaction path of thermal reaction for C5fraction. Mathematics models for reactive distillation of steam cracking C5fraction was established and the parameters of model was determined. The process of reactive distillation was simulated b using Aspen Plus softwar. The key parameters were investigates to figure out the optimal parameters for a design basis of industrial scale. When the number of theoretic plates was100-120, with feeds stage at22～26, reflux ratio of10～15, residence time on each stage was10～15seconds, the reactive distillation column increased yield of isoprene, improved purity of product dicyclopentadiene, and lower cyclopentadiene content in feed of extraction unit.