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23-Chem-A2 Unit Operations and Separation Processes: December 2016

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

  1. Question 1 Pump Power for a Crude-Oil Transfer Line
  2. Question 2 Minimum-Fluidization and Transport Mass Flux
  3. Question 3 Rotary-Drum Filter Speed and Throughput
  4. Question 4 Yield from Cooling Crystallization of KNO 3
  5. Question 5 Countercurrent Rotary Dryer Air Rate
  6. Question 6 Overall Coefficient of a Tubular Heat Exchanger

Start with Question 1 →

Paper format. National Exams — 04-CHEM-A2 Mechanical and Thermal Operations, December 2016. 3 hours, open book. Six problems (Section A Mechanical Operations: A1–A3; Section B Thermal Operations: B1–B3), each 25 marks; candidates attempt at least two from each section (only the first two per section are marked). All six are worked below for completeness.

Reference texts. Coulson & Richardson, Chemical Engineering Vol. 2 (particle technology, sedimentation, fluidization, filtration, crystallization, evaporation, drying) and Vol. 1 (fluid flow, heat transfer); McCabe, Smith & Harriott, Unit Operations of Chemical Engineering (7th ed.); Geankoplis, Transport Processes and Separation Process Principles (4th ed.); Perry's Chemical Engineers' Handbook (9th ed.); Kern, Process Heat Transfer.

Note on chart and property data. A1 uses a Fanning friction-factor chart, B1 a KNO3 solubility curve (mole-fraction basis), and B2/B3 standard steam-table / transport-property values. Engineering choices are flagged in Check callouts.