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23-Chem-B5 Pulp and Paper Technology: December 2017

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

  1. Question 1 Kraft Recovery Cycle — Evaporation, Recovery Boiler, Tall Oil, Digesters & Batch-Digester Mass Balance
  2. Question 2 ECF Bleach Plant — DEopDEpD Sequence, Effluent Parameters, Oxygen Delignification, ClO 2 Generation & Heat Recovery
  3. Question 3 Stock Preparation & Paper Machine Wet End — Freeness, Strength Testing, Cleaning, Drying & Fourdrinier Water/Fibre Balance
  4. Question 4 Mechanical Pulping — Furnish Species, TMP vs. Groundwood, Bleaching, Screening & Grinder Energy/Water Balance

Start with Question 1 →

National Exam 16-Chem-B5, Pulp and Paper Technology — December 2017. 3 hours, OPEN BOOK exam (Casio or Sharp approved calculators only). Per the exam notes, any THREE of the four questions constitute a complete paper (only the first three as they appear in the candidate's answer book are marked), and in Question 2 only the first two of parts (d)–(f) as answered would normally be marked; for completeness this solution answers all FOUR questions in full, including all three optional parts of Question 2. Most parts require an essay-format answer — clarity and organization of the answer are explicitly marked.

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).