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23-Chem-A4 Chemical Reactor Engineering: December 2015

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

  1. Question 1 Parallel Gas-Phase Reactions — Temperature for Selectivity, PFR Volume for Yield
  2. Question 2 Semibatch Reactor — Ether Concentration as a Function of Time
  3. Question 3 CSTR + PFR in Series — Best Ordering for Maximum Conversion
  4. Question 4 Nitration in a CSTR — Adiabatic vs Cooled Volume and Space-Time
  5. Question 5 Recycle (Gradientless) Reactor → Packed-Bed Catalyst Sizing

Start with Question 1 →

National Exams / EGBC — December 2015 — 04-Chem-A4 Chemical Reactor Engineering. Three-hour open-book exam; the designated Fogler textbook (any edition), 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 and applied. Property look-ups not printed on the paper (the gas constant, molar volumes) 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) — the designated open-book text: batch/CSTR/PFR design equations, the stoichiometric table with expansion factor $\varepsilon$ for gas-phase reactions with a change in moles, parallel-reaction selectivity/yield, the semibatch mole balances, and the adiabatic energy balance; O. Levenspiel, Chemical Reaction Engineering (3rd ed., Wiley) — reactor sequencing for >1-order kinetics and packed-bed (catalyst-weight) design; supporting property data from Perry’s Chemical Engineers’ Handbook (9th ed.).