Patent ID: 7341654
Filing Date: 2008-03-11
Classification: C25B

Abstract:
1. A process for the production of a halogen gas by the electrolysis of an aqueous hydrohalic acid solution in an electrolytic cell, said cell comprising an electrocatalyst-containing anode; a cathode; an anolyte chamber; a catholyte chamber; an ion-exchange membrane separating said anolyte chamber from said catholyte chamber and not bonded to one or both of said anode and said cathode; said process comprising the improvement wherein said cathode comprises a non-catalyzed 3-dimensional electroconductive comprising one or more layers of porous structure made of electroconductive material resistant to acidic metal ion solution, said porous cathode having a thickness in the range of 0.5 to 10 millimeters providing a cathodically effective surface area of at least ten times its projected area, and said catholyte feedstock is passed through said porous cathode.