Method for preparing carbonate

Abstract

The present invention relates to a method for preparing a carbonate salt. The method for preparing a carbonate salt can provide a useful material by implementing a carbon dioxide capture method via a capturing agent such as ammonia with an electrolytic device to produce a carbonate salt, and thus capturing carbon dioxide from the atmosphere. Further, the preparation method may purely produce a carbonate salt without generating by-products using electric energy, and at the same time, the capturing agent may be reused without any additional process. Furthermore, the preparation method may selectively provide a carbonate salt in the desired form by adjusting the pH of a solution containing the carbonate salt using the electrolysis of water.

1 . A method for preparing a carbonate salt using an apparatus that comprises an anode chamber; a cathode chamber, which is separated from the anode chamber by a cation exchange membrane; an anode disposed in the anode chamber; and a cathode disposed in the cathode chamber, the method comprising the steps of:
 supplying an aqueous solution containing an alkali metal salt or an alkaline earth metal salt to the anode chamber;   supplying a carbon dioxide and a capturing solution to the cathode chamber; and   applying a voltage to the anode and the cathode such that the cations separated from the aqueous solution containing an alkali metal salt or an alkaline earth metal salt move toward the cathode chamber through the cation exchange membrane.   
     
     
         2 . The method for preparing a carbonate salt of  claim 1 , wherein the capturing solution has a molar concentration of 2 M to 10 M. 
     
     
         3 . The method for preparing a carbonate salt of  claim 1 , wherein the capturing solution is an ammonia solution. 
     
     
         4 . The method for preparing a carbonate salt of  claim 1 , wherein an external voltage of 2 V to 10 V is applied to the anode and the cathode. 
     
     
         5 . The method for preparing a carbonate salt of  claim 1 , further comprising discharging a precipitate from the cathode chamber.