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23-Chem-A4 Chemical Reactor Engineering: December 2016

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Rate that Passes Through a Maximum — Choosing CSTR vs PFR
  2. Question 2 Adiabatic Mixed-Flow Reactor Volume for 90% Conversion
  3. Question 3 Half-Order Batch Kinetics with an Arrhenius Temperature Shift
  4. Question 4 Fixed-Bed PFR — Catalyst Weight and Pore-Diffusion Effectiveness
  5. Question 5 Pulse-Tracer RTD — Tracer Amount, Reactor Volume, and Variance

Start with Question 1 →

National Exams / EGBC — December 2016 — 04-Chem-A4 Chemical Reactor Engineering. Three-hour open-book exam; one textbook of the candidate’s choice (Fogler or Levenspiel), personal unit-conversion / mathematical tables (CRC Handbook) and a non-communicating programmable calculator are permitted. Five questions are printed and any four constitute a complete paper (each worth 25 marks; Q1 and Q4 are split 5 / 12 / 8, Q5 is 9 / 5 / 11); all five are solved below for completeness. No credit is given for re-deriving standard rate expressions, so the batch / CSTR / PFR design equations are quoted and applied, and significant formulae are cited by origin as the rubric requests. Property look-ups not printed on the paper (the gas constant $R$) are stated explicitly in each Given block as permitted open-book references.

Reference texts: H. S. Fogler, Elements of Chemical Reaction Engineering (5th ed., Prentice Hall) — Levenspiel plots and the mixed-flow / plug-flow design equations (Ch. 2), the stoichiometric table (Ch. 3), adiabatic energy balances (Ch. 11–12), internal-diffusion effectiveness factors and the generalized Thiele modulus (Ch. 15), and residence-time distributions (Ch. 16–17). O. Levenspiel, Chemical Reaction Engineering (3rd ed., Wiley, 1999) — the "which reactor is better" rate-curve reasoning (Ch. 5–6) and pulse-tracer RTD analysis (Ch. 11–13).