SAPO-34 nanocrystals (inorganic filler) were incorporated in polyurethane membranes and the permeation properties of CO

2

CH

4

and N

2

gases were explored. In this regard

the synthesized PU-SAPO-34 mixed matrix membranes (MMMs) were characterized via SEM

AFM

TGA

XRD and FTIR analyses. Gas permeation properties of PU-SAPO-34 MMMs with SAPO-34 contents of 5 wt%

10 wt% and 20 wt% were investigated. The permeation results revealed that the presence of 20 wt% SAPO-34 resulted in 4.45%

18.24% and 40.2% reductions in permeability of CO

2

CH

4

and N

2

respectively

as compared to the permeability of neat polyurethane membrane. Also

the findings showed that at the pressure of 1.2 MPa

the incorporation of 20 wt% SAPO-34 into the polyurethane membranes enhanced the selectivity of CO

2

/CH

4

and CO

2

/N

2

14.43 and 37.46%

respectively. In this research

PU containing 20 wt% SAPO-34 showed the best separation performance. For the first time

polynomial regression (PR) as a simple yet accurate tool yielded a mathematical equation for the prediction of permeabilities with

high accuracy (R

2

99%).