The invention discloses a device and a method for preparing high-purity
chlorine dioxide by using a single
electrolyte sodium chlorite electrolysis method. The device comprises a diaphragm type
electrolytic cell, a gas pump set, an absorption
tower, an
exhaust gas absorption
tower and a
storage tank, wherein two diaphragms are arranged inside the diaphragm type
electrolytic cell; the two diaphragms partition the
electrolytic cell into three chambers with an
anode chamber in the middle, and a first
cathode chamber and a second
cathode chamber on both sides;
metal wire fillers are filled in theanode chamber and the
cathode chambers to reduce the inter-
electrode resistance between an
anode and a cathode; a gas distribution plate is arranged at the bottom of the
anode chamber, and ClO2 gas generated by the anode is discharged through the
positive pressure by blasting air, and the product is removed in time to increase the
reaction rate; the cathode chambers also blast air through the airdistribution plate, and
hydrogen generated by the cathode is safely discharged after being diluted. By the
exhaust gas absorption
tower in the device, a small amount of
chlorine dioxide can be effectively recovered and introduced into the anode chamber for recycling without
discharge and without
pollution gas exhaust.