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Apparatus for manufacturing chlorine dioxide

  • US 4,432,856 A
  • Filed: 04/28/1981
  • Issued: 02/21/1984
  • Est. Priority Date: 05/13/1980
  • Status: Expired due to Fees
First Claim
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1. An apparatus for producing chlorine dioxide by the electrolysis of a chlorite solution which comprises:

  • an electrolytic cell for producing chlorine dioxide by electrolysis of a solution of chlorite, said electrolytic cell including an anode compartment and a cathode compartment, said electrolytic cell including means for discharging anolyte from said anode compartment and means for discharging catholyte from said cathode compartment;

    a supply tank having a first input for receiving an aqueous fresh chlorite solution, a first output for supplying a chlorite containing solution, a second input for receiving a mixture of chlorine dioxide and air and a second output for removing a mixture of chlorine dioxide and air from the system;

    a stripping tank having a first output for supplying an anolyte to the anode compartment of said electrolytic cell, a first input coupled to the anode compartment of said electrolytic cell for receiving anolyte containing chlorine dioxide dissolved therein, a second input for receiving a mixture of chlorine dioxide and air, said stripping tank stripping some of said anolyte of chlorine dioxide by said air contained in said mixture supplied thereto, a second output for supplying anolyte containing dissolved chlorine dioxide to an auxiliary stripping tank, and a third output for supplying a mixture of chlorine dioxide and air to said supply tank;

    said auxiliary stripping tank including a first input for receiving anolyte from said stripping tank, a second input for receiving fresh air, a first output for supplying a mixture of chlorine dioxide and air to said stripping tank, said auxiliary stripping tank stripping anolyte of chlorine dioxide dissolved therein by means of said fresh air supplied thereto, and a second output for discharging a part of the anolyte contained in said auxiliary stripping tank from the system;

    a circulation tank coupled to the cathode compartment of said electrolytic cell and including a first input for receiving a first portion of said catholyte discharged from said cathode compartment, a second input for receiving a diluent to dilute the catholyte and to thereby control the alkali concentration of the catholyte in said circulation tank, a first output for supplying diluted catholyte to the cathode compartment of said electrolytic cell, and a second output for discharging a part of the catholyte contained in said circulation tank from the system;

    means for supplying a second portion of the catholyte discharged from said cathode compartment to said first output of said stripping tank;

    means for combining said second portion of said catholyte and said anolyte from said first output of said stripping tank to form a first mixture; and

    means for combining said first mixture with said chlorite containing solution provided at said first output of said supply tank to thereby form a second mixture, and means for supplying said second mixture to said anode compartment of said electrolytic cell.

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