Sodium hydroxide production device and sodium hypochlorite production device including the same

Abstract

One aspect of the present invention provides a sodium hydroxide production device, which includes: a first tank configured to store a sodium salt including two or more sodium ions in a molecule; a first electrolysis unit including a first anode chamber and a first cathode chamber which are partitioned by a first separator; and a water supply unit configured to supply water to the first tank and the first cathode chamber, wherein the first tank, a pipe configured to supply an aqueous sodium salt solution produced in the first tank to the first anode chamber, the first anode chamber, and a pipe configured to supply a material produced in the first anode chamber to the first tank constitute a closed loop, and a sodium hypochlorite production device including the same.

1 . A sodium hydroxide production device comprising:
 a first tank configured to store a sodium salt including two or more sodium ions in a molecule;   a first electrolysis unit including a first anode chamber and a first cathode chamber which are partitioned by a first separator; and   a water supply unit configured to supply water to the first tank and the first cathode chamber,   wherein the first tank, a pipe configured to supply an aqueous sodium salt solution produced in the first tank to the first anode chamber, the first anode chamber, and a pipe configured to supply a material produced in the first anode chamber to the first tank constitute a closed loop.   
     
     
         2 . The sodium hydroxide production device of  claim 1 , wherein the sodium salt has a structure represented by the following Chemical Formula:
   Na x A y   <Chemical Formula>
   in Chemical Formula,   x is an integer of 2 or more,   A is an anionic material capable of bonding to a sodium ion, and   y is an integer satisfying the Chemical Formula.   
     
     
         3 . The sodium hydroxide production device of  claim 2 , wherein the sodium salt is one selected from the group consisting of sodium carbonate, sodium sulfate, sodium persulfate, sodium phosphate dibasic, sodium phosphate tribasic, and a combination of two or more thereof. 
     
     
         4 . The sodium hydroxide production device of  claim 1 , wherein the first separator is a cation-exchange membrane. 
     
     
         5 . A sodium hypochlorite production device comprising the sodium hydroxide production device according to  claim 1 , the device further comprising:
 a second tank configured to store salt;   a second electrolysis unit including a second anode chamber and a second cathode chamber which are partitioned by a second separator; and   a reaction unit configured to react a anodic product produced in the second anode chamber and a cathodic product produced in the first and second cathode chambers to obtain sodium hypochlorite,   wherein the water supply unit supplies water to the second tank and the second cathode chamber, and   saturated salt water produced in the second tank is supplied to the second anode chamber.   
     
     
         6 . The sodium hypochlorite production device of  claim 5 , wherein the sodium hypochlorite production device does not include equipment for injecting sodium hydroxide into the reaction unit from the outside of the sodium hypochlorite production device. 
     
     
         7 . The sodium hypochlorite production device of  claim 5 , wherein the second separator is a cation-exchange membrane. 
     
     
         8 . The sodium hypochlorite production device of  claim 5 , wherein the first and second electrolysis units are connected in parallel. 
     
     
         9 . The sodium hypochlorite production device of  claim 5 , wherein at least one of the first and second electrolysis units is automatically controlled according to a pH of sodium hypochlorite obtained in the reaction unit.