Abstract:
Microporous phenolic polyether membranes are provided having utility in electricity generators, devices for the oxygenation of the blood, degassing of solution, ultrafiltration and the like. These membranes comprise a film of a phenolic polyether which has, on each of its faces, pores of diameter between about 0.1 and 25 Mu , at least some of these pores passing through the entire thickness of the membrane. They can be obtained by: A. FORMING A SOLUTION OF THE PHENOLIC POLYETHER WITH A SOLVENT AND A NON-SOLVENT FOR THIS POLYMER, THE SOLVENT AND NON-SOLVENT BEING MISCIBLE WITH ONE ANOTHER, B. CASTING THIS SOLUTION ON A TEMPORARY SUPPORT, C. LEAVING THE POLYMER LAYER ON THE SUPPORT IN AIR FOR ABOUT 1 SECOND TO 3 MINUTES, AT A TEMPERATURE OF BETWEEN 10*C and the boiling point of the most volatile constituent of the solution, D. IMMERSING THE POLYMER LAYER, STILL ON ITS SUPPORT, IN A COAGULATION BATH, AND E. SEPARATING THE MEMBRANE FROM THE SUPPORT AND DRYING IT.
Abstract:
Separating apparatus, particularly suitable for gas permeation and pervaporaton, such apparatus comprising a plurality of parallelopipedonal frame members having a central cell forming aperture stacked alternately with a plurality of parallelopipedonal membrane members of substantially the same outside dimensions, the membrane members each including two permeable membranes having a porous support interposed therebetween, at least one opening formed in the porous support near one side and extending across between 40 and 90% of the width of the support, with the two membranes secured to one another in a fluid tight manner over a zone within the opening or openings, at least one orifice being formed in the membranes in said zone or zones, the openings of alternate membrane members being on opposite sides of the stack; means for supplying fluid to one end of the stack; means for withdrawing fluid from the other end of the stack; a fluid tight chamber enclosing the stack and means for removing permeate from said chamber.
Abstract:
An anisotropic membrane is provided having excellent mechanical properties combined with good permeation characteristics which comprises a vinyltriorganosilane polymer or copolymer consisting of a dense layer, of average thickness between 0.01 and 10 Mu , and a porous layer with open pores, of thickness up to 500 Mu in which the volume of the interstitial spaces in the porous layer represents 20 to 80 percent of the total volume of the membrane.
Abstract:
Gases, e.g., oxygen, are advantageously absorbed by or removed from aqueous liquids, especially blood, by passage along a partial pressure gradient through a waterproof, porous membrane having pores with an apparent diameter of 0.01 to 3 mu and a critical surface tension of less than 40 dynes/cm. at 20 DEG C.
Abstract:
An anisotropic membrane is provided having excellent mechanical properties combined with good permeation characteristics which comprises a vinyltriorganosilane polymer or copolymer consisting of a dense layer, of average thickness between 0.01 and 10 mu , and a porous layer with open pores, of thickness up to 500 mu in which the volume of the interstitial spaces in the porous layer represents 20 to 80 percent of the total volume of the membrane.
Abstract:
An anisotropic membrane is provided having excellent mechanical properties combined with good permeation characteristics which comprises a vinyltriorganosilane polymer or copolymer consisting of a dense layer, of average thickness between 0.01 and 10 mu , and a porous layer with open pores, of thickness up to 500 mu in which the volume of the interstitial spaces in the porous layer represents 20 to 80 percent of the total volume of the membrane.
Abstract:
An anisotropic membrane is provided having excellent mechanical properties combined with good permeation characteristics which comprises a vinyltriorganosilane polymer or copolymer consisting of a dense layer, of average thickness between 0.01 and 10 mu , and a porous layer with open pores, of thickness up to 500 mu in which the volume of the interstitial spaces in the porous layer represents 20 to 80 percent of the total volume of the membrane.
Abstract:
An anisotropic membrane is provided having excellent mechanical properties combined with good permeation characteristics which comprises a vinyltriorganosilane polymer or copolymer consisting of a dense layer, of average thickness between 0.01 and 10 mu , and a porous layer with open pores, of thickness up to 500 mu in which the volume of the interstitial spaces in the porous layer represents 20 to 80 percent of the total volume of the membrane.
Abstract:
An anisotropic membrane is provided having excellent mechanical properties combined with good permeation characteristics which comprises a vinyltriorganosilane polymer or copolymer consisting of a dense layer, of average thickness between 0.01 and 10 mu , and a porous layer with open pores, of thickness up to 500 mu in which the volume of the interstitial spaces in the porous layer represents 20 to 80 percent of the total volume of the membrane.