Method for manufacturing titanium trichloride solution and device for manufacturing titanium trichloride solution

Abstract

A method for manufacturing a titanium trichloride solution according to an embodiment of the present invention is a method for manufacturing a titanium trichloride solution, the method including reducing titanium tetrachloride in an electrolyte solution by using an ion-exchange electrolytic reduction method. In the method, an aqueous solution containing sulfate ions is used as an electrolyte solution on the anode side. A device for manufacturing a titanium trichloride solution according to another embodiment of the present invention is a device for manufacturing a titanium trichloride solution by electrolytic reduction of titanium tetrachloride in an aqueous solution. The device includes an anode chamber that stores an anode electrolyte solution, a cathode chamber that is separated from the anode chamber by an ion-exchange membrane and that stores the titanium tetrachloride solution, an anode immersed in the anode electrolyte solution in the anode chamber, and a cathode immersed in the titanium tetrachloride solution in the cathode chamber. In the device, the anode electrolyte solution contains sulfate ions.

1 . A method for manufacturing a titanium trichloride solution, the method comprising reducing titanium tetrachloride in an electrolyte solution by using an ion-exchange electrolytic reduction method,
 wherein an aqueous solution containing sulfate ions is used as an electrolyte solution on the anode side.   
     
     
         2 . The method for manufacturing a titanium trichloride solution according to  claim 1 , wherein a molar concentration of the sulfate ions in the electrolyte solution on the anode side is equal to or more than a total molar concentration of other anions in the electrolyte solution on the anode side. 
     
     
         3 . The method for manufacturing a titanium trichloride solution according to  claim 1 , wherein a cation-exchange membrane is used as an ion-exchange membrane in the ion-exchange electrolytic reduction method. 
     
     
         4 . The method for manufacturing a titanium trichloride solution according to  claim 3 , wherein a total molar concentration of metal ions in the electrolyte solution on the anode side is 1/10 or less of the molar concentration of the sulfate ions. 
     
     
         5 . The method for manufacturing a titanium trichloride solution according to  claim 1 , wherein an anion-exchange membrane is used as an ion-exchange membrane in the ion-exchange electrolytic reduction method. 
     
     
         6 . The method for manufacturing a titanium trichloride solution according to  claim 1 , comprising a step of adding an oxidation inhibitor to the electrolyte solution on the cathode side. 
     
     
         7 . The method for manufacturing a titanium trichloride solution according to  claim 6 , wherein a carboxylic acid having two or more carboxyl groups or a salt of the carboxylic acid is used as the oxidation inhibitor. 
     
     
         8 . A device for manufacturing a titanium trichloride solution by electrolytic reduction of titanium tetrachloride in an aqueous solution, the device comprising an anode chamber that stores an anode electrolyte solution; a cathode chamber that is separated from the anode chamber by an ion-exchange membrane and that stores the titanium tetrachloride solution; an anode immersed in the anode electrolyte solution in the anode chamber; and a cathode immersed in the titanium tetrachloride solution in the cathode chamber,
 wherein the anode electrolyte solution contains sulfate ions.