Calculators›Claus Process
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Claus Process Sulfur Recovery

API 955 · GPSA · Kohl & Nielsen

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Claus Sulfur Recovery Calculator
Designs sulfur recovery units using the Claus process with thermal and catalytic stages. Calculates air demand, sulfur production, and overall recovery efficiency for acid gas treating applications.

Feed Conditions

lb-mol/hr
%
From amine regenerator or sour water stripper

Process Conditions

°F
°F
stages
Typical Ranges:
Furnace: 1800-2700°F
Converter: 400-650°F
Stages: 2-3 (92-96% recovery)

About Claus Process

Thermal Stage: H₂S + 1.5 O₂ → SO₂ + H₂O
Catalytic: 2 H₂S + SO₂ → 3 S + 2 H₂O

Converts hydrogen sulfide to elemental sulfur. 1/3 combusted, 2/3 catalytically reacted.

📚 Learn the Theory

Understand claus process principles, calculations, and industry applications

Read Engineering Guide →

About This Calculator

Calculates sulfur recovery material balance and efficiency per API 955 and GPSA standards.

Key Aspects:

  • Thermal Stage: 1/3 H₂S combustion
  • Catalytic: Multi-stage reaction
  • Efficiency: 92-96% typical (2-3 stages)
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