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

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

  1. Question 1 Minimum Area of a Continuous Thickener
  2. Question 2 Frictional Pressure Drop in Series Pipes with a Reducer
  3. Question 3 Pressure Drop and Power for Gas Flow through a Bed
  4. Question 4 Flash vs. Differential Distillation of Benzene–Toluene
  5. Question 5 Batch Drying Time (Constant + Falling Rate)
  6. Question 6 Adsorption Isotherm Selection and Surface Area

Start with Question 1 →

Paper format. 16-CHEM-A2, Unit Operations and Separation Processes — December 2018, 3-hour open-book exam. Six 25-point problems: Part A (Unit Operations) — A1 continuous-thickener sizing, A2 series-pipe friction pressure drop, A3 packed/fluidized-bed pressure drop & power; Part B (Separation Processes) — B1 flash vs. differential distillation, B2 batch-drying time, B3 adsorption isotherm fitting & surface area. 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.); Coulson & Richardson, Chemical Engineering Vol. 2 (5th 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, §12 drying, §16 adsorption, §18 solid–liquid separation).