Reverse osmosis or nanofiltration membrane and its production process

摘要

PCT No. PCT/FR91/00826 Sec. 371 Date Apr. 21, 1993 Sec. 102(e) Date Apr. 21, 1993 PCT Filed Oct. 21, 1991 PCT Pub. No. WO92/06775 PCT Pub. Date Apr. 30, 1992.The invention relates to a reverse osmosis or nanofiltration membrane and to its production process. This membrane comprises a porous support made from an inorganic material coated on one face with a first mesoporous inorganic material layer, e.g. of TiO2, having a mean pore radius below 10 nm and a second active layer, having a thickness of 0.1 to 1 mu m, made from sulphonated polysulphone, polybenzimidazolone, grafted polyvinylidine fluoride or Nafion.