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Simulation of hydrocarbons pyrolysis in a fast-mixing reactor

Chinese Journal of Chemical Engineering 2015年第6期23卷 941-953页

作者： M.G.Ktalkherman I.G.Namyatov Khristianovich Institute of Theoretical and Applied Mechanics Russian Academy of ScienceSiberian Branch Voevodsky Institute of Chemical Kinetics and Combustion Russian Academy of ScienceSiberian Branch

Currently, thermal decomposition of hydrocarbons for the production of basic petrochemicals(ethylene, propylene) is carried out in steam-cracking processes. Aside from the conventional method, under consideration are alternative ways purposed for process intensification. In the context of these activities, the method of hightemperature pyrolysis of hydrocarbons in a heat-carrier flow is studied, which differs from previous ones and is based on the ability of an ultra-short time of feedstock/heat-carrier mixing. This enables to study the pyrolysis process at high temperature(up to 1500 K) at the reactor inlet. A set of model experiments is conducted on the lab scale facility. Liquefied petroleum gas(LPG) and naphtha are used as a feedstock. The detailed data are obtained on temperature and product distributions within a wide range of the residence time. A theoretical model based on the detailed kinetics of the process is developed, too. The effect of governing parameters on the pyrolysis process is analyzed by the results of the simulation and experiments. In particular, the optimal temperature is detected which corresponds to the maximum ethylene yield. Product yields in our experiments are compared with the similar ones in the conventional pyrolysis method. In both cases(LPG and naphtha), ethylene selectivity in the fast-mixing reactor is substantially higher than in current technology.

关键词： Liquefied petroleum gas Pyrolysis Olefins fast-mixing reactor

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