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🧪 Mass Transfer and Separation Processes - Complete Guide

Fundamental and applied aspects of diffusion, interphase transport, and unit operations like distillation, absorption, and extraction.

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Interactive Tools
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Case Studies
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Resources
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Mass Transfer and Separation Processes - Complete Guide

Mass transfer is how molecules move from one place to another—like sugar dissolving in tea or perfume spreading across a...

Quick Start

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Knowledge Base

14 pages
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Key Concepts

Mass Transfer and
Separation ProcessesFick’s Laws of DiffusionMolecular vs. Turbulent
Diffusion
Interphase Mass Transfer
(Two-Film, Penetration)
Mass Transfer Coefficients
(kₗ, k₉, Kₗ, K₉)
Equilibrium Relationships
(Raoult’s, Henry’s Law)
McCabe–Thiele MethodCore Principles & Models

Visual overview of key concepts and their relationships

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Real Projects

5 cases
Ethanol-Water Separation in Biofuel Plant High energy demand; purity <92% in first-pass distillation Feed (40% EtOH) LP Col α = 8.2 @ 1 atm Vapour (88% EtOH) Bottoms (Water-rich) PS Switch HP Col Mol. Sieve 99.5% EtOH Q_R = 1.8 MW Column Vapour flow PS Switch Challenge

Ethanol-Water Separation in Biofuel Plant

20 MTPD corn-based ethanol facility in Iowa, USA

Challenge: High energy demand for azeotropic distillation; poor purity (<92%) in first-pass...
CO₂ Capture from Flue Gas using Amine Absorption Flue Gas (0.15 bar CO₂) Cross-flow structured packing NTU_G = 6.4 Lean MEA (X_in = 0.25) Rich MEA (X_out ≈ 0.45) L = 142 m³/h Reclaimer Unit • Low pCO₂ (0.15 bar) • Amine degradation & carryover

CO₂ Capture from Flue Gas using Amine Absorption

Coal-fired power plant retrofit in Germany (600 MW)

Challenge: Low CO₂ partial pressure (~0.15 bar); amine degradation and solvent carryover
Pharmaceutical API Purification via Crystallization ⚠ Polymorphic instability • Acetone > 5000 ppm (ICH Q3C) Feed Solution (API + Acetone) Anti-solvent Crystallizer S = C/C_sat = 1.8 Vacuum Dryer N₂ purge ln(C/C₀) = −kt t = 4.2 h → 200 ppm Crystallization Drying Feed Challenge

Pharmaceutical API Purification via Crystallization

Active pharmaceutical ingredient (API) manufacturing in Singapore

Challenge: Polymorphic instability and residual solvent > ICH Q3C limits (e.g., acetone > 5...
Feed AMW[REE] <10 mg/LpH ≈ 2.5Stage 1 SXD_Y = 420 @ pH 2.8ScrubbingE = 94% (H₂SO₄)PrecipitationOxalic acidFe³⁺/Al³⁺interferencepH-sensitiveRare Earth Recovery from Acid Mine DrainageDesign: Two-stage D2EHPA/kerosene SX | Selective H₂SO₄ scrub | Oxalate precipitation

Rare Earth Element Recovery from Acid Mine Drainage

Pilot-scale hydrometallurgical plant in Wales, UK

Challenge: Ultra-low REE concentrations (<10 mg/L), high Fe³⁺/Al³⁺ interference, pH-sensiti...
Food-Grade Citric Acid PurificationLiquid-Liquid Extraction with TOA/IsodecanolStage 1Stage 2Stage 5Centrifugal Contactors (N = 5)Feed Broth
(Citric Acid + Glucose)Raffinate
(Glucose-rich, low citric)
Extract Phase
TOA/Isodecanol + Citric
Back-extractionChallenge: Emulsion Formationβ = 1250 • N = 5 • 20% H₂SO₄

Food-Grade Citric Acid Purification via Liquid-Liquid Extraction

Fermentation-based citric acid plant in Brazil

Challenge: High viscosity broth, emulsion formation with tertiary amines, difficult phase s...
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Downloads

5 resources
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Learning Path

27 lessons

Master Mass Transfer and Separation Processes through a structured learning path — from fundamentals to advanced applications.

Your Progress 0/27 completed
28 Getting Started with Mass Transfer and Separation Processes 29 Understanding Molecular Diffusion: Fick’s Laws in Steady & Unsteady State 30 Calculating Diffusion Fluxes Using Fick’s First Law 31 Two-Film Theory vs. Surface Renewal: When Each Applies 32 Estimating Mass Transfer Coefficients from Dimensionless Numbers 33 Vapor–Liquid Equilibrium: Raoult’s Law Limitations and Activity Models 34 Designing Binary Distillation Columns Using the McCabe–Thiele Method 35 Case Review: Ethanol-Water Separation Optimization 36 Packed Tower Hydrodynamics and Mass Transfer Zones 37 HTU-NTU Calculations for CO₂ Capture Systems 38 Case Review: Amine-Based Flue Gas CO₂ Capture 39 Tie-Line Construction and Lever Rule Applications 40 Stage-by-Stage and Ponchon–Savarit Calculations for LLE 41 Case Review: Citric Acid Purification via Centrifugal Extraction 42 Langmuir and Freundlich Isotherms: Assumptions and Fitting Methods 43 Solution-Diffusion Model for RO and Pervaporation 44 Drying Curve Analysis: Critical Moisture Content and Falling-Rate Dynamics 45 Crystallizer Design: MSMPR Modeling and Residence Time Distribution 46 Geometric, Kinematic, and Dynamic Similarity in Mass Transfer Equipment 47 Comparative Analysis: Tray vs. Packed Columns, Mixer-Settlers vs. Centrifugal Contactors 48 Flammability Assessment and VOC Emission Control Strategies 49 Solvent Life Cycle Analysis: GWP, PMI, and E-Factor Calculations 50 CAPEX/OPEX Drivers in Separation Units: Energy, Materials, Controls 51 Heat Integration in Distillation Networks: Pinch Analysis Basics 52 Mass Transfer Fundamentals Quiz 53 Separation Process Design Scenario Quiz 54 Safety & Environmental Compliance Quiz
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