System for reducing carbon dioxide, and electrolysis cell for same

Abstract

An electrolysis cell for reducing carbon dioxide includes at least one stack made of an anode space, a cathode space, and optionally a gas space adjoining the cathode space, as well as fluid supply lines and fluid discharge lines that are configured to supply the anode space with anolyte, the cathode space with catholyte and electively gas, or the optional gas space with gas, and a power line for applying a voltage between the cathode space and anode space. In embodiments, multiple stacks are provided and the fluid supply lines and the fluid discharge lines and the power line are configured for the simultaneous supply of fluid and application of current to multiple, in particular all, stacks.

1 . An electrolysis cell for reducing carbon dioxide, comprising at least one stack made of an anode space a cathode space and a gas space adjoining the cathode space as well as fluid supply lines and fluid discharge lines that are configured to supply the anode space with anolyte, the cathode space with catholyte, and the gas space with gas, and a power line for applying a voltage between the cathode space and anode space, wherein multiple stacks are provided and the fluid supply lines and the fluid discharge lines and the power line are configured for the simultaneous supply of fluid and application of current to multiple, in particular all, stacks, wherein the gas space of a stack comprises a gas space inlet, which is connected to the fluid supply line for the gas space, and comprises a gas space outlet, which is connected to the fluid discharge line from the gas space, and wherein the stacks are clamped between end plates. wherein the fluid supply lines and the fluid discharge lines run through the end plates. 
     
     
         2 . The electrolysis cell according to  claim 1 , wherein the stacks are respectively constructed in layer form. 
     
     
         3 . The electrolysis cell according to  claim 1 , wherein the stacks form a cylinder, wherein the stacks rest against one another. 
     
     
         4 . The electrolysis cell according to  claim 1 , wherein the fluid supply lines are arranged perpendicularly to the stacks. 
     
     
         5 . The electrolysis cell according to  claim 1 , characterized in that the fluid discharge lines are arranged perpendicularly to the stacks. 
     
     
         6 . The electrolysis cell according to  claim 1 , wherein the cathode space of a stack comprises a cathode space inlet which is connected to the fluid supply line for the cathode space and a cathode space outlet which is connected to the fluid discharge line from the cathode space. 
     
     
         7 . The electrolysis cell according to  claim 6 , wherein the cathode space outlet lies opposite from the cathode space inlet in particular is offset by 180°. 
     
     
         8 . The electrolysis cell according to one  claim 1 , wherein the anode space of a stack comprises an anode space inlet which is connected to the fluid supply line for the anode space and an anode space outlet, which is connected to the fluid discharge line from the anode space. 
     
     
         9 . The electrolysis cell according to  claim 8 , wherein the anode space outlet lies opposite from the anode space inlet in particular is offset by 180°. 
     
     
         10 . (canceled) 
     
     
         11 . The electrolysis cell according to  claim 1 , characterized wherein the gas space outlet lies opposite from the gas space inlet in particular is offset by 180°. 
     
     
         12 .- 13 . (canceled) 
     
     
         14 . The electrolysis cell according to  claim 1 , wherein the stacks are embodied with, in particular static, mixing elements in the anode space and/or in the cathode space and/or the gas space. 
     
     
         15 . The electrolysis cell according to  claim 14 , wherein the mixing elements comprise helical fluid paths. 
     
     
         16 . A system for continuously reducing carbon dioxide, comprising an electrolysis cell according to one  claim 1 . 
     
     
         17 . The system according to  claim 16 , wherein an anolyte container for the supply of anolyte to the anode spaces of the stacks and a catholyte container for the supply of catholyte to the cathode spaces are provided and are configured for the corresponding supply. 
     
     
         18 . The system according to  claim 16 , wherein a circuit for carbon dioxide is provided, via which circuit unconverted carbon dioxide can be returned to the stacks for further conversion. 
     
     
         19 . The system according to  claim 16 , wherein a separating device for separating gaseous products is provided, wherein the separating device is configured to return unconverted carbon dioxide for further conversion.