Porous Polysulfone Diaphragm As Separator In Electrochemical Processes

Electrochemical processes are widely used for production of various chemicals. When the process is carried out in chemically hostile conditions, a special separator is required to separate catholyte and anolyte solutions. The Porous Polysulfone Diaphragms reinforced with non-woven support fabric for use as separator in electrochemical processes involving highly acidic solutions. These diaphragms have very high porosity (60-70%) with submicron pore sizes resulting in low electrical resistance in electrolyte solutions and are stable up to 30% H₂SO₄ solution. The production cost of these diaphragms is lower by an order of magnitude compared to presently used Nafion membranes with comparable properties. 
The polysulfone diaphragm can be used as a separator in electrolytic cell for production of various chemicals such as ammonium per sulphate (NH₄)₂S₂O₈ by electrochemical process in acidic medium. 

The process of manufacturing porous polysulfone diaphragm consists of preparation of a casting solution using optimum quantities of polysulfone polymer, selected additives and appropriate solvent followed by coating of this solution over a non-woven polyester support fabric and then gelling it in water to produce a polysylfone-nonwoven fabric support integrated film (diaphragm). The film is annealed in boiling water to remove traces of additives and solvent before use. 

For details contact :
   

    Head, Technology Transfer & Collaboration Division,
    BHABHA ATOMIC RESEARCH CENTRE,
    TROMBAY, MUMBAI - 400 085
    Fax : 091-022-25505151
    Email : technology@barc.gov.in