Simulations And Analyses For Reactor System Of Ethylene Production By Catalytic Dehydration Of Ethanol

According to the theory of system modeling, ethanol dehydration of ethanol for ethylene is taken as the research system, and ethylene production and ether production is taken as an independent response, with ethanol and ethylene as a key group points. Then one-dimensional and two-dimensional mathematical models are set up on a multi-phase catalytic tube type fixed-bed reactor integral.For one-dimensional mathematical model we used Runge-Kutta method to solve the equations numerically and two-dimensional mathematical model, by choosing orthogonal collocation method radial partial differential will be transformed into discrete mathematical model of the nonlinear equations, we reuse Runge-Kutta method in the various equations of the axial. By computer simulation we get the axial and radial distribution of the species concentration of ethanol ethylene reactor in the reaction process. Then according to the different response to the simulation based on different operating conditions, we study the infection based on different experimental temperature and feed rate for ethylene production by ethanol dehydration. Experimental results show that the increasing temperature can increase the output of ethylene, and the selectivity of reaction has markedly been improved, but ethanol conversion of transformation rate is relatively small. With the feed rate increasing, the catalyst selectivity first decreased and then increased, and is higher than 90%, when the feed flow rate is less than 0.8 ml/min, the conversion rate is more than 80%, when flow rate is too large, and the conversion rate will drop rapidly. At the same time, the two-dimensional model results also show that the smaller tube diameter makes difference of radial concentrations on catalytic bed in reactor small, and the calculated results are basically the same as the one-dimensional model. Therefore the one-dimensional model of reactor simulation is appropriate. Finally, by analysis method, in accordance with the one-dimensional mathematical model, under current production conditions, the optimum conditions of reaction are: temperature: 423℃, feed rate: 1.1 ml/min. Then according to the system evaluation and axiology, separately analyze and value the technology of ethylene production by dehydration of bio-ethanol from social values, technological conditions and the economic value. It comes to the conclusion that under current conditions, the technology of ethylene production by dehydration of bio-ethanol is feasible as the complementarity and substitution of the oil industry technology.