초록 ▼

High flux semipermeable membranes which comprises the polymerized reaction product within and/or on a porous support backing material may be prepared by contacting the porous support such as a polysulfone with an aqueous solution of a polyamine which may, if so desired, contain a polar aprotic solve

High flux semipermeable membranes which comprises the polymerized reaction product within and/or on a porous support backing material may be prepared by contacting the porous support such as a polysulfone with an aqueous solution of a polyamine which may, if so desired, contain a polar aprotic solvent not reactive with the amines, a polyhydric compound and an acid acceptor. The surface of the coated support is freed of excess solution and thereafter contacted with an organic solution of a polyacyl halide for a period of time sufficient to form a polymerized reaction product within and/or on the support material. The resulting composite is then treated with a hydroxy polycarboxylic acid, polyaminoalkylene polycarboxylic acid, suffonic acid, amine salts of acids, amino acid, amino acid salt, polymeric acid and inorganic acid, before drying of the membrane. This will enable the membrane to be stored in a dry manner prior to use thereof in a separation process. The resultant membrane composite may be used in separation processes such as desalination of brackish or sea water or the softening of domestic hard water.

대표청구항 ▼

A high flux semipermeable membrane prepared by coating a porous support backing material with an aqueous solution of a polyamine, removing excess solution, contacting the coated porous support backing material with an organic solvent solution of a polyacyl halide, polysulfonyl halide or polyisocyana

A high flux semipermeable membrane prepared by coating a porous support backing material with an aqueous solution of a polyamine, removing excess solution, contacting the coated porous support backing material with an organic solvent solution of a polyacyl halide, polysulfonyl halide or polyisocyanate to form a condensation reaction product within and/or on the surface of said porous support backing material, treating the resultant composite with a solution of an acid selected from the group consisting of hydroxypolycarboxylic acids, polyaminoalkylene polycarboxylic acids, sulfonic acids, amine salts of acids, amino acids, amino acid salts, polymeric acids and inorganic acids, drying and recovering the resultant high flux semipermeable membrane.