Electrolysis apparatus

An electrolysis cell comprising a housing, an anode, a cathode, a diaphragm member consisting essentially of a cationactive permselective membrane substantially impervious to liquids and gases, said diaphragm member consisting essentially of a sulfostyrenated perfluoroethylene propylene polymer, said diaphragm member separating said anode and said cathode thereby forming an anode compartment and a cathode compartment, said anode compartment having outlet means for the removal of gaseous products formed at the anode, inlet means for introducing an acidified, saturated alkali metal chloride brine into said anode compartment, a second outlet means for removing depleted brine from said anode compartment and brine replenishing means in communication with both said inlet means and said second outlet means, such that depleted brine is removed from the anode compartment through said second outlet means, passed through said replenishing means wherein it is resaturated and acidified and reintroduced into the anode compartment through said inlet means, and said cathode compartment containing a liquid inlet, a liquid outlet and an outlet for the gaseous products formed at the cathode.