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Understanding Mole Balances and Rate Laws in PFRs and PBRs: A Comprehensive Lecture

This lecture covers crucial concepts in chemical engineering, focusing on mole balances in Plug Flow Reactors (PFRs) and Packed Bed Reactors (PBRs). Key topics include the differential form of mole balance, rate laws, and stoichiometry, emphasizing pressure drop effects on liquid phase reactions. The session utilizes Polymath for problem-solving, demonstrating isothermal processes and integrating equations for gas phase reactions. Examples illustrate applications of stoichiometry and rate laws, reinforcing the foundational principles of reactor design.

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Understanding Mole Balances and Rate Laws in PFRs and PBRs: A Comprehensive Lecture

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Presentation Transcript

  1. Lecture 8 Tuesday 1/29/08 • Block 1: Mole Balances on PFRs and PBRs • Must Use the Differential Form • Block 2: Rate Laws • Block 3: Stoichiometry Pressure Drop: Liquid Phase Reactions. Pressure Drop Does Not Effect the Concentrations in Liquid Phase Rxns Gas Phase Reactions. Epsilon not Equal to Zero d(P)/d(W)=.. Polymath will combine with d(X)/f(W)=..for you Epsilon = 0 and Isothermal P=f(W) Combine then Separate Variables (X,W) and Integrate Gas Phase Reaction. PBR Example 1: Polymath Solution A + 2B  C Gas Phase Reaction. PBR Example 2: Analytical Solution A + B  C + D

  2. Heat Effects Isothermal Design Stoichiometry Rate Laws Mole Balance

  3. 2. Rate Law: –rA=kCA23: Stoichiometry

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