📋 Case Study

Ethanol-Water Separation in Biofuel Plant

High energy demand for azeotropic distillation; poor purity (<92%) in first-pass product

🏗️ Project Overview

20 MTPD corn-based ethanol facility in Iowa, USA

🎯 Challenge

High energy demand for azeotropic distillation; poor purity (<92%) in first-pass product

🔧 Design Approach

Integrated pressure-swing distillation with molecular sieve dehydration

📐 Design Diagram

AI-generated project design illustration

📐 Key Calculations

Relative Volatility (α)

y_ethanol/x_ethanol ÷ y_water/x_water

Result: 8.2 at 1 atm

Dictates minimum stages required

Reboiler Duty

Q_R = R_min × D × λ

Result: 1.8 MW

Drives steam consumption and emissions

📊 Results

99.5% ethanol purity achieved; 37% reduction in steam usage; ROI in 2.3 years

💡 Lessons Learned

• •Azeotrope-breaking requires rigorous thermodynamic modeling
• •Material compatibility critical with wet ethanol streams

✅ Key Takeaways

• 1Azeotrope-breaking requires rigorous thermodynamic modeling
• 2Material compatibility critical with wet ethanol streams