The reactant concentration is given in terms of molarity (kmol/m 3). The forward reaction specific rate is 31.1 h -1 (0.008639 sec -1) at 360 K with activation energy of 65.7 kJ/mol (65.7x10 6 J/kmol). The reaction stoichiometry is shown below:īoth forward and reverse reactions are 1st order with respect to reactants. To describe the n-butane isomerization reaction, an Aspen reaction model of POWERLAW type is created: ISOMER.

PENG-ROB predicts the heat of isomerization to vary from -7430 J/mol C4H10 at 330 K to -7080 J/mol C4H10 at 360 K. The isomerization heat of reaction is also a function of temperature. Pressure also affects liquid heat capacity. The higher the temperature, the higher the heat capacity will be. Within the temperature range of 330 K to 360 K, PENG-ROB predicts liquid heat capacity of 157-185 J/mol One of several equations-of-state well-known to be suitable for hydrocarbon systems, Peng-Robinson equation-of-state should provide reasonable calculations for heats of reaction and heat capacities. PENG-ROB, Aspen Peng-Robinson equation-of-state property model, is chosen to describe the thermophysical properties of this hydrocarbon liquid mixture. These three components are called directly from built-in Aspen pure component databanks.ĭifferent property models can yield different predictions for various thermophysical properties used in mass and energy balance calculations. The liquid catalyst is not included because its flowrate is not known and the specific reaction rate has been given for the reaction condition. Three components are considered in the Aspen model: C4H10 (n-butane), IC4H10 (isobutane) and IPENTANE (2-methyl-butane). Calculate the CSTR volume for the same conditions as the PFR.Plot and analyze X, X e, T and -r A down the length of the reactor.Calculate the PFR volume necessary to process 100,000 gal/day (160 kmol/h) at 70% conversion of a mixture 90 mol % n-butane and 10 mol % of i-pentane, which is considered an inert.This elementary reversible reaction is to be carried out adiabatically in the liquid phase under high pressure using a liquid catalyst which gives a specific reaction rate of 31.1 h -1 at 360 K.

Normal butane, C 4H 10, is to be isomerized to isobutane in a plug-flow reactor. Example 11-3 Adiabatic Liquid-Phase Isomerization of Normal Butane You can download the ASPEN backup file here that completes this problem. This section is a tutorial to walk you through Problem 11-3 for the 1st edition of Essentials of Chemical Reaction Engineering. Aspen Plus - Examples ASPEN PLUS™ Example Problems

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