OP-II-3

OP-III-B-17bed reactor, pilot experiments in a single-tube reactor set-up (Fig.1) and itsmathematical modeling have been carried out.Pilot reactor testing has beenperformed with two different catalystbatches by varying process parameters,viz. thermostat temperature, gas flowrate, and residence time in catalyst bed.Effect of the process parameters on theethanol conversion, the amount andcomposition of by-products formed inthe reaction has been studied. Theindex C of ethanol consumption per unitof raw ethylene has been determined. Fig. 2. Comparison of measured and simulatedtemperature profiles in tubular reactor.The results obtained show that thelowest index C=1.75 can be achieved when ethanol conversion is less than 98%, andthermostat temperature does not exceed 440°C. At the above conditions thecatalysts exhibited good performance and stability.A two-dimensional pseudo-homogeneous model of a catalyst bed incorporatingwith a dusty-gas model of aTable 1 Experimental and modeling data in the pilotcatalyst particle was used fortubular reactor of ethylene productionmathematical modeling of theParameter Experiment ModelingEthanol conversion (%) 98.9 98.5 process [2]. The simulatedEthylene selectivity (%) 98.6 98.8Acetaldehyde selectivity (%) 0.17 0.26 temperature profiles and data onDiethyl ether selectivity (%) 0.11 0.21 ethanol conversion and productButylenes selectivity (%) 1.1 0.9selectivities were in a goodagreement with ones observed in pilot experiments (Fig.2, Table 1). Considering thisfact, the model has proved the applicability in design and optimization of theindustrial multi-tubular packed bed reactor for ethylene production. As a result, theoptimal process parameters in industrial tubular reactor for bio-ethanol dehydration toethylene over alumina-based catalysts have been determined.References[1]. A. Morschnacker, J. Macromol. Sci.// Polym. Rev., 2009, vol. 49:2, p.79-84.[2]. A.P. Kagyrmanova, I.A. Zolotarskii, E.I. Smirnov, N.V. Vernikovskaya, Chem. Eng. J., 2007,vol.134, p.228-234.214