θ	time-lag, [s]
l	membrane film thickness, [m]
Deff,i	effective diffusion coefficient of component i, [cm2/s]
Peff,i	effective permeability of component i, [Barrer]
Ni	volumetric flowrate of component i, [Nm3/h]
Am	membrane area, [m2]
Δpi	partial pressure difference between feed an permeate side of component i, [bar]
Seff,i	effective solubility coefficient of component i, [cm3STP/(cm3 cmHg)]; [mol/(m3 bar)]
αij	selectivity of component i and j, [-]
Tg	glass transition temperature, [°C]
T	temperature, [°C]
wAC	weight content of AC in MMM, [%]
mr,i	remaining relative mass of AC, MMM or Matrimid®, [%]
φAC	volume content of AC in MMM, [%]
ρi	density of component i, [kg/m3]
Mi	molecular mass of the component i, [kg/mol]
q	adsorption concentration, [mol/m3]
qmax	the maximum adsorbed concentration possible for a monolayer coverage, [mol/m3]
p	pressure, [bar]
b	parameter for an adsorbate-adsorbent pair, [1/bar]
H	Henry coefficient, [mol/(m3 bar)]
c	concentration, [mol/m3]
Pc	permeability continuous phase, [Barrer]
Pd	permeability dispersed phase, [Barrer]
φd	volume fraction dispersed phase, [-]