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23-Chem-B5 Pulp and Paper Technology: Undated paper

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

  1. Question 1 ECF Bleach Chemistry, Oxygen Delignification & Chlorine Dioxide Generation/Dosing
  2. Question 2 Oxygen Delignification & ClO 2 Dosing — Wood Supply, Washing & Fresh Water
  3. Question 3 Mechanical Pulping — Furnish Species, Grinding vs. Refining, Bleaching, TMP Screening & Grinder Energy/Water Balance
  4. Question 4 Stock Testing, Pulp Cleaning, Paper Machine Drying & Fourdrinier Wet End — Water/Fibre Balance
  5. Question 5 Kraft Recovery Cycle — Evaporation, Recovery Boiler, Tall Oil, Digesters & Continuous-Digester Kappa Control
  6. Question 6 Batch-Digester House & Recausticizing Mass Balance

Start with Question 1 →

National Exam 16-Chem-B5, Pulp and Paper Technology — May 2019. 3 hours, CLOSED BOOK exam (Casio or Sharp approved calculators only). Per the exam notes, any FIVE of the six questions constitute a complete paper (only the first five as they appear in the candidate's answer book are marked); for completeness this solution answers all SIX questions in full. Most parts require an essay-format answer — clarity and organization of the answer are explicitly marked.

Every specific reconstruction is flagged inline at the point it is used; the underlying arithmetic for all boxed numbers.

Reference texts: Smook (rev. Kocurek), Handbook for Pulp & Paper Technologists, 4th ed.; Biermann, Handbook of Pulp and Paper Technology, 2nd ed.; Perry's Chemical Engineers' Handbook, 9th ed. (generic mass/energy-balance and heat-exchanger methods).