Batch Reactors at Constant Volume or Constant Pressure
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This Demonstration compares the time for an irreversible, gas-phase reaction to reach a certain fractional conversion in an isothermal batch reactor operating either at constant volume or at constant pressure. Both reactors start at the same initial conditions. If the reaction involves a mole change and the rate of reaction is not zero or first-order, then the time to reach a certain conversion is different for the two types of reactors; in a constant-pressure reactor, the reactant concentration changes because of the volume change due to the mole change.