Electrochemical half-cell

Abstract

The invention concerns an electrochemical half-cell for preparing chlorine from aqueous alkali chloride solutions, comprising an electrode chamber ( 17 ) designed to contain an electrolyte. Said half-cell also comprises several gas pockets ( 26, 27, 28, 29 ) which are separated from the electrode chamber ( 17 ) by a gas-diffusing electrode ( 5 ). The invention is characterized in that said half-cell includes a support element ( 21 ), for supporting the gas pockets ( 26, 27, 28, 29 ), which is adjacent over its entire surface to the rear wall ( 20 ) of the pockets ( 26, 27, 28, 29 ) or which constitutes the rear wall ( 20 ) of said gas pockets ( 26, 27, 28, 29 ).

1 . An electrochemical half-element, in particular for producing chlorine from aqueous solutions of alkali metal chloride, at least comprising 
 an electrode space for receiving an electrolyte, the electrode space having an electrolyte feed and an electrolyte discharge,    a gas space, formed from a plurality of gas pockets, for receiving gas, the bottom gas pocket having a gas feed,    a connecting passage, which connects two gas pockets to one another and through which the gas emerging from a lower gas pocket via an outlet opening flows into a gas pocket above it via an inlet opening,    a gas diffusion electrode, which separates the electrode space from the gas pockets, and    a support element for supporting the gas pockets, which support element bears against the back wall of the gas pockets over its entire surface or forms the back wall of the gas pockets.    
     
     
         2 . The electrochemical half-element as claimed in  claim 1 , wherein the support element is formed in the manner of a well.  
     
     
         3 . The electrochemical half-element as claimed in  claim 1  or  2 , wherein the support element is connected fixedly, to the half-shell of the half-element.  
     
     
         4 . The electrochemical half-element as claimed in  claim 1 , wherein the support element is connected to the half-shell, via one or more bearing elements.  
     
     
         5 . The electrochemical half-element as claimed in  claim 4 , wherein the bearing element is a trapezium profiled section or a Z profiled section.  
     
     
         6 . The electrochemical half-element as claimed in  claim 1 , wherein the connecting passage ) is arranged on the support element.  
     
     
         7 . An electrochemical half-element as claimed in  claim 3 , wherein the support element is connected by welding.  
     
     
         8 . An electrochemical half-element as claimed in  claim 4 , wherein the support element is connected electrically conductively.  
     
     
         9 . The electrochemical half-element as claimed in  claim 2 , wherein the support element is connected fixedly, to the half-shell of the half-element.  
     
     
         10 . The electrochemical half-element as claimed in  claim 2 , wherein the support element is connected to the half-shell, via one or more bearing elements.  
     
     
         11 . The electrochemical half-element as claimed in  claim 3 , wherein the support element is connected to the half-shell, via one or more bearing elements.  
     
     
         12 . The electrochemical half-element as claimed in  claim 2 , wherein the connecting passage is arranged on the support element.  
     
     
         13 . The electrochemical half-element as claimed in  claim 3 , wherein the connecting passage is arranged on the support element.  
     
     
         14 . The electrochemical half-element as claimed in  claim 4 , wherein the connecting passage is arranged on the support element.  
     
     
         15 . The electrochemical half-element as claimed in  claim 5 , wherein the connecting passage is arranged on the support element.