process for chlorieren and bromieren in an electrolytic water and device for this

摘要

A process for the halogenation of water comprises passing an electrolysis current through a porous, permeable anode and a cathode forming an electrodic gap with water passing therethrough, passing an aqueous solution of an alkali metal halide containing at least 25 g/l of the halide through the porous, permeable anode into the electrodic gap and controlling the hydrodynamic flow through the anode to maintain the weight ratio of active halogen to halide in the water leaving the electrodic gap of at least 0.2, preferably near 1. Apparatus for carrying out this process comprises a diaphragmless electrolysis cell 1 having a compartment 2 containing a cathode 3 and a compartment 4 separated from the compartment 2 by a porous anode 5. There is also a brine circuit 6,7,8, for circulating brine through the cell. Some of the brine is electrolysed and leaves the compartment 2 containing hypochlorite. IMAGE