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23-Chem-A2 Unit Operations and Separation Processes: Undated paper

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

  1. Question 1 Rate of Wash-Water Flow through a Batch Centrifugal Filter
  2. Question 2 Diameter of a Smooth Pipe from a Measured Pressure Drop
  3. Question 3 Pressure Drop through a Bed of Ion-Exchange Resin
  4. Question 4 Number of Transfer Units for a Packed Distillation Tower
  5. Question 5 Absorber Operating Line in Solute-Free Coordinates
  6. Question 6 SO₂ Adsorption Isotherm and Surface Area

Start with Question 1 →

Paper format. National Exams — 16-CHEM-A2 Unit Operations and Separation Processes, May 2019 (this is the “undated” PDF; the cover sheet is a faint template reading MAY, while every interior page reads May 2019). 3 hours, open book. Six problems: Section A (Momentum-transfer / mechanical operations) A1–A3, and Section B (Separation processes) B1–B3, each 25 marks. Candidates attempt at least two from each section and only the first two per section are marked; all six are worked below for completeness.

Reference texts. Geankoplis, Transport Processes and Separation Process Principles (4th ed.) — filtration, packed beds, absorption, adsorption, packed-tower distillation; McCabe, Smith & Harriott, Unit Operations of Chemical Engineering (7th ed.); Coulson & Richardson, Chemical Engineering Vol. 2; Treybal, Mass-Transfer Operations (3rd ed.); Perry's Chemical Engineers' Handbook (9th ed.).

Note on the data. The B1 feed is described as acetone–water but the equilibrium table supplied is explicitly acetone–ethanol — B1 is solved with the data actually provided (acetone–ethanol) and the discrepancy is flagged.