Pervaporative dehydration of 1-methoxy propanol (MP) over the entire concentration range of 0-100% is studied. The membrane selection criterion for a particular component separation has been discussed with the help of pervaporative separation of water from a mixture of water and 1-MP. For this study polyacrylonitrile (PAN)--homo-polymer and six of its different co-polymer membranes, namely, PAN-maleic anhydride (Manh), PAN-hydroyethylmethacrylate (HEMA), PAN-acrylic acid (Aa), PAN-methacrylic acid (MAa), PAN-methylmethacrylate (MMA), and PAN-styrene (Sty) prepared through emulsion polymerization. Performances of these membranes are compared with PAN-homo-polymer, The co-polymer properties. in particular, solubility parameter. component group contribution and interaction parameter values are used to explain perm-behavior (selectivity and flux). Co-polyiners of AN showed good selectivity with reasonable flux.