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23-Chem-A4 Chemical Reactor Engineering: May 2018

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

  1. Question 1 Ethane Cracking — PFR Volume for 60% Conversion
  2. Question 2 Catalytic Packed Bed — Rate Expression from Conversion Data
  3. Question 3 Pyrolysis — PFR Length for 90% Conversion
  4. Question 4 Two Adiabatic CSTRs in Series — Annual Production of B
  5. Question 5 Batch Reactor Sizing and Two-Stage CSTR Conversion

Start with Question 1 →

National Exams / EGBC — May 2018 — 16-Chem-A4 Chemical Reactor Engineering. Three-hour open-book exam; one textbook of the candidate’s choice (Fogler or Levenspiel), 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); all five are solved below for completeness. No credit is given for re-deriving standard rate expressions, so the batch / CSTR / PFR / packed-bed design equations are quoted (with their source) and applied. Property look-ups not printed on the paper (the gas constant, molar volumes, unit conversions) are stated explicitly in each Given block as permitted open-book references.

Reference texts: H. S. Fogler, Elements of Chemical Reaction Engineering (4th/5th ed., Prentice Hall) — batch/CSTR/PFR design equations, the stoichiometric table with expansion factor $\varepsilon$ for gas-phase reactions with a change in moles, packed-bed (catalyst-weight) mole balances, and the adiabatic CSTR energy balance and multiplicity of steady states; O. Levenspiel, Chemical Reaction Engineering (3rd ed., Wiley) — reactors in series for $>$1-order kinetics and batch turnaround; supporting property data from Perry’s Chemical Engineers’ Handbook (9th ed.).