Handout - Gas Phase Stoichiometry

Handout - Gas Phase Stoichiometry - CHE 4151 Jennings...

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CHE 4151 Jennings HANDOUT - Gas Phase Stoichiometry Reactor modeling usually begins with writing one or more material balances containing at least two “variables”, molar flow rate of reactant (F A ) and reaction rate (r A ). The reaction rate is usually a function of the molar concentrations of reactants (C A , C B , etc.). The molar flow rate may be expressed as the product of molar concentration and volumetric flow rate (Q). In liquid phase reactors, it is usually reasonable to assume that volumetric flow rate is constant, allowing substitution for F A in the material balance in terms of C A . In gas phase systems, the volumetric flow rate may not be constant, and thus Q must be expressed in terms of either F A or C A in order to reduce the number of variables in the equation. To determine whether Q may be assumed constant, consider the definitions of total molar flow rate (F T ) and total molar concentration (C T ). F T = Q C T . Assuming that the ideal gas law is valid, C T = P/RT. Thus
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Handout - Gas Phase Stoichiometry - CHE 4151 Jennings...

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