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23-Chem-A2 Unit Operations and Separation Processes: May 2018

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

  1. Question 1 Washing of a Filter Cake — Porosity, Density and Solute Loading
  2. Question 2 Pump Power for Pipe Flow with Fittings
  3. Question 3 Velocity to Just Lift a Particle (Free Settling)
  4. Question 4 Diameter and Pressure Drop of a Packed Absorption Tower
  5. Question 5 Langmuir and Freundlich Isotherms for Papain Adsorption
  6. Question 6 Two-Stage Cross-Current Liquid–Liquid Extraction

Start with Question 1 →

Paper format. 16-CHEM-A2, Unit Operations and Separation Processes — May 2018, 3-hour open-book exam. Six 25-point problems: Part A (Unit Operations) — A1 filter-cake washing, A2 pipe flow & pump power, A3 free-settling of a particle; Part B (Separation Processes) — B1 packed-tower flooding/diameter, B2 adsorption isotherms, B3 multistage liquid–liquid extraction. The rubric asks for two problems per part; all six are worked in full below.

Reference texts (subject). McCabe, Smith & Harriott, Unit Operations of Chemical Engineering (7th ed.); Geankoplis, Transport Processes and Separation Process Principles (4th ed.); Treybal, Mass-Transfer Operations (3rd ed.); Perry's Chemical Engineers' Handbook (§6 fluid & particle mechanics, §14 packed towers, §15 extraction, §16 adsorption).