A Levenspiel plot is used to determine which aspect of reactor design?

• A. The volume of a reactor needed to achieve a given conversion
• B. The activation energy of the reaction
• C. The operating pressure
• D. The reaction enthalpy

Answer: (A)

Levenspiel plots are used to size a reactor for a desired conversion by applying the design relation for a plug flow reactor, dV/dX = F_A0/(-r_A). This means the volume needed to reach a conversion X is V = F_A0 ∫_0^X dX/(-r_A). Graphically, plotting how the rate -(r_A) depends on conversion (or plotting the reciprocal 1/(-r_A) versus X) allows you to read off the required volume from the area under the curve up to the target conversion. In short, this plot directly links conversion to reactor volume for sizing.

Activation energy, operating pressure, and reaction enthalpy are determined from kinetic temperature dependence and thermodynamics, not from Levenspiel plots, which focus on how much volume is needed to achieve a specified conversion.