Gas permeability/selectivity 

Tool

Homemade, all stainless steel, gas permeability/selectivity apparatus

Applications

Diffusivity, activation energy, permeability, selectivity of gases through porous and non-porous (polymeric, liquid) membranes. Catalytic performance of membrane contactors and membrane reactors

Technical Specifications

Operation modes: (1) Isobaric counter current diffusion. (2) Cross flow permeability/selectivity. (3) Dead-end permeability (pressure drop under constant flow). (4) Relative permeability (gas, vapor/pre-adsorbed vapor). (5) Membrane contactor and membrane reactor.

Gases: Single phase and binary/tertiary mixtures of all permanent gases and vapors.

Sweep gases: Usually He, Ar, N₂

Pressures: 1-60 bar

Differential pressures: 0-10 bar

Temperature: From ambient to 300^oC

Diffusivities: 10^-5 to 10^-11 cm²/sec

Permeance: 10^-8 to 10^-14 mol/m²/sec/Pa

Membrane conformation: Flat discs, films, tubular and multi-channel monoliths, hollow fibers 

Membrane surface area: Depends on the permeation characteristics. Usual range from 2 to 500 cm²

Additional ToolsMembrane modules. Cryostat with circulation pump and special membrane modules for measurements below ambient temperature (0-25oC), Cryostat bath for relative permeability measurement at low relative pressures. High sensitivity specific gas analysers (CO₂, O₂, SO₂, H₂S) for highly dense-low permeance membranes