Eletrochemical half-element

Abstract

An electrochemical half cell comprises a gas diffusion electrode ( 22 ) that serves as an anode or cathode and separates an electrode space from a gas space ( 2 ). In addition, a number of gas pockets ( 2 ) are provided that are formed by the gas diffusion electrode ( 22 ) and a rear wall ( 5 ). A gas connecting channel ( 1 ) that connects two gas pockets to one another is provided through which the gas flows via a gas supply connection ( 3 ) into the gas pocket located thereabove. In order to be able to easily detach the connection, the gas supply connection ( 3 ) is accessible from the side of the gas diffusion electrode ( 22 ).

1 . An electrochemical half-element, in particular for the electrolysis of aqueous solutions of alkali metal chloride, comprising at least 
 an electrode space for receiving electrolyte having an electrolyte feed and an electrolyte discharge,    a gas space formed from a plurality of gas pockets for receiving gas, each gas pocket having a back wall and a gas diffusion electrode as cathode or anode which separates the gas space from the electrode space,    a connecting passage which connects two gas pockets to one another and through which the gas which emerges from a lower gas pocket via an outlet opening flows via a gas-feed connection into a gas pocket above, wherein    the gas-feed connection can be detached from the side of the gas diffusion electrode.    
     
     
         2 . The electrochemical half-element as claimed in  claim 1 , wherein the gas-feed connection has a fixed part, which is connected to the connecting passage, and a mating piece, which is connected to the gas pocket, the fixed part and the mating piece being releasably connected to one another.  
     
     
         3 . The electrochemical half-element as claimed in  claim 2 , wherein the mating piece has a through-opening extending from the back wall to the gas diffusion electrode.  
     
     
         4 . The electrochemical half-element as claimed in  claim 3 , wherein the through-opening serves to receive a securing pin which is connected to the fixed part.  
     
     
         5 . The electrochemical half-element as claimed in  claim 2 , wherein the fixed part and the mating piece have gas passages which are in communication with one another.  
     
     
         6 . The electrochemical half-element as claimed in  claim 5 , wherein the fixed part and/or the mating piece has a compensation passage for compensating for any offset between the gas passages.  
     
     
         7 . The electrochemical half-element as claimed in  claim 2 , wherein a baffle plate is arranged between the gas passages provided in the mating piece and the gas diffusion electrode.  
     
     
         8 . The electrochemical half-element as claimed in  claim 1 , wherein the gas-feed connection is arranged centrally between two longitudinal sides of the gas pocket, and outlet openings, which can be opened or closed depending on the arrangement, are provided in each case on the longitudinal sides.  
     
     
         9 . An electrochemical half-element as claimed in  claim 2 , wherein the fixed part is connected to a front wall of the connecting passage.  
     
     
         10 . An electrochemical half-element as claimed in  claim 2 , wherein the melting piece is connected to a back wall of the gas pocket.  
     
     
         11 . The electrochemical half-element as claimed in  claim 3 , wherein the fixed part and the mating piece have gas passages which are in communication with one another.  
     
     
         12 . The electrochemical half-element as claimed in  claim 4 , wherein the fixed part and the mating piece have gas passages which are in communication with one another.  
     
     
         13 . The electrochemical half-element as claimed in  claim 3 , wherein a baffle plate is arranged between the gas passages provided in the mating piece and the gas diffusion electrode.  
     
     
         14 . The electrochemical half-element as claimed in  claim 4 , wherein a baffle plate is arranged between the gas passages provided in the mating piece and the gas diffusion electrode.  
     
     
         15 . The electrochemical half-element as claimed in  claim 5 , wherein a baffle plate is arranged between the gas passages provided in the mating piece and the gas diffusion electrode.  
     
     
         16 . The electrochemical half-element as claimed in  claim 2 , wherein the gas-feed connection is arranged centrally between two longitudinal sides of the gas pocket, and outlet openings, which can be opened or closed depending on the arrangement, are provided in each case on the longitudinal sides.  
     
     
         17 . The electrochemical half-element as claimed in  claim 3 , wherein the gas-feed connection is arranged centrally between two longitudinal sides of the gas pocket, and outlet openings, which can be opened or closed depending on the arrangement, are provided in each case on the longitudinal sides.  
     
     
         18 . The electrochemical half-element as claimed in  claim 4 , wherein the gas-feed connection is arranged centrally between two longitudinal sides of the gas pocket, and outlet openings, which can be opened or closed depending on the arrangement, are provided in each case on the longitudinal sides.  
     
     
         19 . The electrochemical half-element as claimed in  claim 5 , wherein the gas-feed connection is arranged centrally between two longitudinal sides of the gas pocket, and outlet openings, which can be opened or closed depending on the arrangement, are provided in each case on the longitudinal sides.  
     
     
         20 . The electrochemical half-element as claimed in  claim 7 , wherein the gas-feed connection is arranged centrally between two longitudinal sides of the gas pocket, and outlet openings, which can be opened or closed depending on the arrangement, are provided in each case on the longitudinal sides.