Ionic Block Copolymers as Piezodialysis Membranes

  • G. Lopatin
  • H. A. Newey


Piezodialysis, or pressure dialysis, is a relatively new concept for desalting water by using membranes and pressure[l]. In contrast to reverse osmosis, where the product water is separated from a saline solution, piezodialysis has the feature that salt is preferentially removed from the feed. The process (though not the method) is quite analogous to electrodialysis except that the required ionic current is obtained by pressure and the consequent solution flow through the membrane, and not by an externally applied EMF as in electrodialysis. The most feasible approach to an actual technique incorporates a special membrane, the so-called charge mosaic membrane, which consists of small anionic and cationic exchange channels juxtaposed and each extending continuously from one membrane surface to the other as shown in the following diagram:


Block Copolymer Reverse Osmosis Quaternary Ammonium Salt Ionic Polymer Reverse Osmosis Membrane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    U. Merten, Desalination, 1, 297–310 (1966).CrossRefGoogle Scholar
  2. 2.
    J. N. Weinstein and S. R. Caplan, Science, 161, 70–72 (1968).CrossRefGoogle Scholar
  3. 3.
    G. Lopatin and H. A. Newey, Office of Saline Water Research and Development Progress Report No. 690, May 1971.Google Scholar
  4. 4.
    D. J. Meier, Polymer Preprints, 11, No. 2, 400 (1970).Google Scholar
  5. 5.
    G. Holden, E. T. Bishop and N. R. Legge, J. Polymer Sci. Part C, 26, 37 (1969).Google Scholar
  6. 6.
    E. T. Bishop and S. Davison, J. Polymer Sci., Part C, 26, 57 (1969).Google Scholar
  7. 7.
    A. Katchalski, S. Lifson, and H. Eisenberg, J. Polymer Sci., 7, 571 (1951)Google Scholar
  8. A Katchalski, et al., J. Polymer Sci., 8, 7–76 (1952).Google Scholar
  9. 8.
    L. R. G. Treloar, Physics of Rubber Elasticity, Clarendon Press, Oxford (1958), p. 196.Google Scholar
  10. 9.
    J. G. McKelvey, Jr., K. S. Spiegler, and M. R. J. Wyllie, J. Phys. Chem., 61, 174 (1957).CrossRefGoogle Scholar
  11. 10.
    L. Dresner and K. A. Kraus, J. Phys. Chem., 67, 990 (1963).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1972

Authors and Affiliations

  • G. Lopatin
    • 1
  • H. A. Newey
    • 1
  1. 1.Shell Development CompanyEmeryvilleUSA

Personalised recommendations