Calculators›Membrane Separation
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Membrane Gas Separation

GPSA · Solution-Diffusion · Permeability

Membrane Gas Separation Calculator
Evaluates membrane performance for CO2 removal, nitrogen rejection, and hydrogen recovery. Calculates permeate/retentate compositions, stage cut, and membrane area requirements based on selectivity.

Feed Gas Conditions

MMscfd
psig
psig
°F
Tip: Pressure ratio (Pfeed/Pperm) > 10 provides optimal separation driving force per GPSA guidelines.

Feed Composition

mol%
mol%
CA: High selectivity, moderate permeability

Design Parameters

%
Note: Stage cut 15-25% typical for single-stage CO₂ removal. Higher cuts increase CH₄ loss.

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About This Calculator

Evaluates membrane gas separation using the solution-diffusion model per Industry guidelines.

Key Parameters:

  • Selectivity (α): CO₂/CH₄ ratio - higher means better separation
  • Pressure Ratio: Feed/permeate pressure - target > 10:1
  • Stage Cut (θ): Permeate/feed flow - affects purity vs. recovery

Industry Standards:

  • GPSA Section 16 - Gas Treating
  • API RP 14E - Piping Design
  • Typical flux: 0.5-2.0 scf/ft²·day·psi

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