Extractive Distillation And Continuous Distillation Combined With The Extraction Of The The Trimethylbenzene Fraction Of Research In The Hydrocracking C <sub> 9 </ Sub>

The prospects of hydrocracking C9 arenes which was the important byproduct from process of producing ethylene was summarized simply in this paper. Hydrocracking C9 arenes such as the present status, the application and the technologies were introduced minutely. At the same time, the prospects and the economic valuableness were presented deeply. The method which combined extractive distillation with continuous distillation was adopted to refine trimethylbenzene fraction from hydrocracking C9 arenes, trimethylbenzene could be used to produce dimethylbenzene.Experiment apparatus of single stage gas-liquid equilibrium was set up. Vapor-liquid equilibrium data of solvents-hydrocracking C9 arenes was obtained by single stage gas-liquid equilibrium apparatus, and the best solvent, sulfolane, was selected by the analysis of relative volatility. The result will be provided for extractive distillation of refining light C9 arenes fraction from hydrocracking C9 arenes.Extractive distillation was simulated by Aspen plus and orthogonal expermient, and the conditions of simulation such as solvent ratio, output rate, reflux ratio, and number of column plates were studied. The theoretic data was gained, and it would be used to experiment. In the optimal condition, the purity of trimethylbenzene was enhanced to 97.4% from hydrocracking C9 arenes, and 90.1% yield can be achieved. The solvent, sulfolane, was used circularly.Continuous distillation was simulated by Aspen plus and orthogonal expermient, and the conditions of simulation such as output rate, number of column plates, plate of input and reflux ratio were studied. The theoretic data was gained, and it would be used to experiment. Experiment apparatus of continuous distillation was set up, and the influences of experiment process were studied. In the optimal condition, the purity of trimethylbenzene was enhanced 98.9% from hydrocracking C9 arenes, and 91.4% yield can be achieved.In this paper, we used hydrocracking C9 arenes as raw material, the method which combined extractive distillation with continuous distillation was adopted to refine trim- ethylbenzne fraction, it was first proposed. It demonstrated the feasibility of routing acc- ording to vapor-liquid equilibrium, analog simulation and experimental research. Also it provided for the industrialized production at the mean time.