The paper presents some ways of poly(phenylene oxide) and its derivatives applications for formation of semipermeable membranes. Three kinds of various membranes were prepared: ultrafiltration, nanofiltration and dialytic species. It was shown that porous modified membrane was not prone for protein fouling as its off-charge analogue. Composite nanofiltration membrane, obtained by coating of porous PPO support by PPO-sulfonated derivative, rejected sodium sulfate two times more effective than sodium chloride. Additionally, gel-like membrane prepared from aminated PPO behaved excellently in deacidification of HCl-KCl and H2SO4-K2SO4 mixtures.

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