Asymmetric, semipermeable membranes of cyclic polyureas

Details Asymmetric, semipermeable membranes of cyclic polyureas Asymmetric, semipermeable membranes of cyclic polyureas

B - Operations, Transporting

01

D

402/166, 18/27,

B01D 71/62 (2006.01) C08L 79/04 (2006.01)

Patent

CA 1052707

ABSTRACT OF THE DISCLOSURE Asymmetric, semipermeable membranes of polyhydantions or polyparabanates having the general formulae Image (I) Image (II) in which R1 and R2 represent, independently of each other, hydrogen, C1 to C6 alkyl or C3 to C6 cycloalkyl groups, or together with the carbon atom in the 5-position a cycloalkyl group containing 5 to 10 carbon atoms; and R3 and R4 represent, independently of each other, C1 to C12 alkylene, C3 to C6 cycloalkylene or rylene group; which groups representing R1, R2, R3 and R4 may be connected to groups identical with themselves or the another of said groups by way of bridge members and may contain ether, ester and acid amide groups; and R5 represents a bond or a group R3 or R4; and X and Y represent, independently of each other a bond or the groups Image ; Image ; Image or -OR6, wherein R6 represents aryl, C1 to C12 alkyl, C1 to C12 hydroxyalkyl or C1 to C12 alkoxyalkyl group; and n = 2 to 200. The membranes are used for the desalination of sea water, brackish water and effluent water, for the separation of substances from solutions and for the concentration of fruit juices according to the principle of reverse osmosis and ultra-filtration, in particular in stringly acid media at pH values of 0 to 4 and at elevated temperatures.

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