Separation of mixed amino acids by BMED process using porous SPES and SPSf cation exchange membranes

•Porous SPES and SPSf cation exchange membranes are prepared by phase inversion.•The porous SPES and SPSf membranes are used in BMED to separate Glu and Lys.•The porous SPES and SPSf membranes are more efficient in BMED process than dense membranes.•The membrane pore morphology influences the concentration and purity of recovered Lys significantly.