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Molecular Sieve Dehydration Design

GPSA Section 20 · UOP · BASF · Zeochem

Molecular Sieve Dehydration Calculator
Professional-grade bed sizing for deep gas dehydration to <1 ppm water. Calculates sieve mass, vessel dimensions, MTZ, pressure drop, and regeneration requirements per GPSA Section 20 and UOP design guidelines.

Operating Conditions

MMscfd
psig
°F
Inlet conditions during adsorption cycle

Sieve Selection & Water Content

lb/MMscf
lb/MMscf
4A (Sodium Aluminosilicate)
Pore: 4Å · Capacity: 22% H₂O
Most common for NG; removes H₂O + CO₂ + H₂S in single step

Design Parameters

hours
ft/min
GPSA Recommended:
• Cycle: 8-24 hours typical
• Velocity: 40-80 ft/min
• H/D ratio: 2:1 to 4:1

📚 Learn the Theory

Understand zeolite types, TSA regeneration cycles, MTZ concepts, and bed sizing fundamentals for dehydration systems.

Read Engineering Guide →

About This Calculator

Professional molecular sieve dehydration bed sizing per GPSA Section 20. Calculates all critical design parameters for TSA systems.

Key Calculations:

  • Dynamic Capacity: Temperature and saturation corrections per GPSA Fig 20-37
  • MTZ Analysis: Mass transfer zone length and breakthrough margin
  • Ergun Equation: Pressure drop through packed bed
  • Z-Factor: Gas compressibility for actual flow
  • Regeneration: Heat duty and gas requirements

Design Basis:

  • 70% capacity utilization (conservative)
  • 15% upset factor for flow variations
  • Bed height ≥ 3× MTZ for reliability

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