Electrolyte composition for electrolysis of brine, method for electrolysis of brine, and sodium hydroxide prepared therefrom

Abstract

The present invention relates to an electrolyte composition for electrolysis of brine, a method for electrolysis of brine, and sodium hydroxide prepared therefrom, and particularly to an electrolyte composition for electrolysis of brine, a method for electrolysis of brine comprising injecting brine and pure water respectively to a cation chamber and an anion chamber divided by a separation membrane installed in an electrolytic cell through a brine injection tube and a pure water injection tube, and applying a power source to an anode plate and a cathode plate installed in the cation chamber and anion chamber to separate produced chloride gas, hydrogen gas, and a sodium hydroxide aqueous solution characterized in that an aqueous solution of a platinum compound is injected into the anion chamber through the pure water injection tube, and sodium hydroxide prepared therefrom.

1 . An electrolyte composition for electrolysis of brine comprising an aqueous solution of a platinum compound.  
     
     
         2 . The electrolyte composition for electrolysis of brine according to  claim 1 , wherein the platinum compound is selected from a group consisting of hexachloroplatinate (IV) (H 2 PtCl 6 . 6H 2 O), potassium tetrachloroplatinate (II) (K 2 PtCl 4 ), diaminodinitroplatinum (II) (Pt(NH 3 ) 2 (NO) 2 ), hexaaminoplatinum (IV) chloride (Pt(NH 3 ) 6 Cl 4 ), tetraamine platinum (II) chloride (Pt(NH 3 ) 4 Cl 2 ), hydrogen hexahydroxoplatinate (IV) (H 2 Pt(OH) 6 ), and sodium tetrachloroplatinate (II) (Na 2 PtCl 4 . 6H 2 O).  
     
     
         3 . The electrolyte composition for electrolysis of brine according to  claim 1 , wherein the contents of the platinum compound in the aqueous solution of the platinum compound are 0.1 to 10 wt %.  
     
     
         4 . The electrolyte composition for electrolysis of brine according to  claim 1 , wherein the aqueous solution of the platinum compound is used in the amount of 0.1 to 2 liters per 1 liter of pure water.  
     
     
         5 . A method for electrolysis of brine, comprising injecting brine and pure water respectively to a cation chamber and an anion chamber divided by a separation membrane installed in an electrolytic cell through a brine injection tube and a pure water injection tube, and applying a power source to an anode plate and a cathode plate installed in the cation chamber and anion chamber to separate produced chloride gas, hydrogen gas, and sodium hydroxide aqueous solution, characterized in that an aqueous solution of a platinum compound is injected into the anion chamber through the pure water injection tube.  
     
     
         6 . The method for electrolysis of brine according to  claim 5 , wherein the aqueous solution of the platinum compound is injected through a separate platinum compound aqueous solution injection tube connected with the pure water injection tube.  
     
     
         7 . The method for electrolysis of brine according to  claim 5 , wherein the platinum compound is selected from a group consisting of hexachloroplatinate (IV) (H 2 PtCl 6 . 6H 2 O), potassium tetrachloroplatinate (II) (K 2 PtCl 4 ), diaminodinitroplatinum (II) (Pt(NH 3 ) 2 (NO) 2 ), hexaaminoplatinum (IV) chloride (Pt(NH 3 ) 6 Cl 4 ), tetraamine platinum (II) chloride (Pt(NH 3 ) 4 Cl 2 ), hydrogen hexahydroxoplatinate (IV) (H 2 Pt(OH) 6 ), and sodium tetrachloroplatinate (II) (Na 2 PtCl 4 . 6H 2 O).  
     
     
         8 . The method for electrolysis of brine according to  claim 5 , wherein the contents of the platinum compound in the aqueous solution of the platinum compound are 0.1 to 10 wt %.  
     
     
         9 . The method for electrolysis of brine according to  claim 5 , wherein the aqueous solution of the platinum compound is used in an amount of 0.1 to 2 liters per 1 liter of pure water.  
     
     
         10 . Sodium hydroxide prepared by the method of  claim 5 .  
     
     
         11 . An apparatus for electrolysis of brine, comprising: 
 a cation chamber and an anion chamber divided by a separation membrane installed in an electrolytic cell;    an anode plate and a cathode plate respectively equipped in the cation chamber and the anion chamber;    a brine injection tube connected with the cation chamber;    a pure water injection tube connected with the anion chamber; and    a platinum compound aqueous solution injection tube connected with the pure water injection tube.    
     
     
         12 . Sodium hydroxide prepared by the method of  claim 6 .  
     
     
         13 . Sodium hydroxide prepared by the method of  claim 7 .  
     
     
         14 . Sodium hydroxide prepared by the method of  claim 8 .  
     
     
         15 . Sodium hydroxide prepared by the method of  claim 9.