The present disclosure is intended to prevent blockage of a path that allows a fluid to flow to a predetermined position where a pressure of the fluid is applied to a cell unit. An electrochemical compressor according to an embodiment includes first and second members, an elastic body, a fluid chamber, and a fluid path. The elastic body exerts an elastic force in a direction in which the first member and the second member are pushed apart from each other, and thereby presses a stack of electrochemical cells. The fluid chamber has the elastic body disposed therein and receives boosted gas flowing thereinto, the fluid chamber allowing the boosted gas to apply a pressure to push the first member and the second member apart from each other. The fluid path connects the fluid chamber to a flow path into which the boosted gas is discharged from the electrochemical cells.

The present disclosure is intended to prevent blockage of a path that allows a fluid to flow to a predetermined position where a pressure of the fluid is applied to a cell unit. An electrochemical compressor according to an embodiment includes first and second members, an elastic body, a fluid chamber, and a fluid path. The elastic body exerts an elastic force in a direction in which the first member and the second member are pushed apart from each other, and thereby presses a stack of electrochemical cells. The fluid chamber has the elastic body disposed therein and receives boosted gas flowing thereinto, the fluid chamber allowing the boosted gas to apply a pressure to push the first member and the second member apart from each other. The fluid path connects the fluid chamber to a flow path into which the boosted gas is discharged from the electrochemical cells.

What is provided is a metal ion recovery device including: a raw solution tank that is configured to store a metal ion containing raw solution including metal ions; a recovery liquid tank that is configured to store a metal ion recovery liquid including metal ions recovered from the metal ion containing raw solution; a metal ion selective permeable membrane that separates the raw solution tank and the recovery liquid tank and selectively transmits the metal ions; an anode that is arranged on a side of the metal ion selective permeable membrane close to the raw solution tank; a cathode that is arranged on a side of the metal ion selective permeable membrane close to the recovery liquid tank; a porous current collector that is formed of a conductive material; a first spacer that is configured to maintain a gap between the metal ion selective permeable membrane and the anode; and a second spacer that is configured to maintain a gap between the metal ion selective permeable membrane and the cathode, in which the anode is arranged to be electrically connected to the metal ion selective permeable membrane through the porous current collector, and the cathode is arranged to be electrically connected to the metal ion selective permeable membrane through the porous current collector, and two or more of at least one of the raw solution tank and the recovery liquid tank are provided.

A sample concentrator includes a lower frame and an upper frame coupled to overlap each other, wherein the lower frame includes a first electrode buffer channel and a second electrode buffer channel spaced apart from each other, a main channel formed in the lower frame and connecting the first electrode buffer channel to the second buffer channel, a first ion exchange membrane located between the first electrode buffer channel and the main channel, a second ion exchange membrane located between the second electrode buffer channel and the main channel, a first electrode electrically connected to the main channel with the first electrode buffer channel interposed therebetween, and a second electrode electrically connected to the main channel with the second electrode buffer channel interposed therebetween.

A sample concentrator includes a lower frame and an upper frame coupled to overlap each other, wherein the lower frame includes a first electrode buffer channel and a second electrode buffer channel spaced apart from each other, a main channel formed in the lower frame and connecting the first electrode buffer channel to the second buffer channel, a first ion exchange membrane located between the first electrode buffer channel and the main channel, a second ion exchange membrane located between the second electrode buffer channel and the main channel, a first electrode electrically connected to the main channel with the first electrode buffer channel interposed therebetween, and a second electrode electrically connected to the main channel with the second electrode buffer channel interposed therebetween.

A method and system for electrochemically regenerating hydroxide (MOH) and carbon dioxide (CO.sub.2) from an alkali metal carbonate (M.sub.2CO.sub.3) via an electrochemical reactor that can replace a conventional thermochemical causticizing operation in a DAC system. The electrochemical reactor comprises: a cathode having an inlet for receiving an electrolyte feed stream comprising MOH, M.sub.2CO.sub.3 and H.sub.2O, and an outlet for discharging an electrolyte product stream comprising MOH, M.sub.2CO.sub.3, H.sub.2O and H.sub.2; a porous hydrophilic transport barrier in adjacent contact with the cathode; a porous hydrophilic anode in adjacent contact with the transport barrier configured and operable to generate CO.sub.2 in the presence of MOH while suppressing their recombination; a porous hydrophobic CO.sub.2 and O.sub.2 separation barrier in adjacent contact with the anode; and a product gas exit channel in adjacent contact with the CO.sub.2 and O.sub.2 separation barrier and for discharging an anode product stream comprising at least CO.sub.2.

A module comprises a cell stack having a plurality of alternating ion depleting compartments and ion concentrating compartments, an inlet manifold configured to facilitate a flow of fluid into the cell stack, and a first flow distribution system, associated with the inlet manifold, including a first ramp to promote the circulation of the flow of fluid into the cell stack.

A module comprises a cell stack having a plurality of alternating ion depleting compartments and ion concentrating compartments, an inlet manifold configured to facilitate a flow of fluid into the cell stack, and a first flow distribution system, associated with the inlet manifold, including a first ramp to promote the circulation of the flow of fluid into the cell stack.

Provided are spacers, ion-exchange devices comprising spacers, and methods of preparing spacers for improved fluid distribution and sealing throughout an ion-exchange device. These spacers can include an internal cavity surrounded by a perimeter of the spacer. The perimeter can have a first opening and a second opening within the perimeter, and the first opening and the second opening can be located on opposite sides of the internal cavity. The spacers can also have a first and second plurality of channels located within the perimeter, wherein each channel of the first and second plurality of channels extends from the internal cavity towards the first opening or the second opening.

Provided are spacers, ion-exchange devices comprising spacers, and methods of preparing spacers for improved fluid distribution and sealing throughout an ion-exchange device. These spacers can include an internal cavity surrounded by a perimeter of the spacer. The perimeter can have a first opening and a second opening within the perimeter, and the first opening and the second opening can be located on opposite sides of the internal cavity. The spacers can also have a first and second plurality of channels located within the perimeter, wherein each channel of the first and second plurality of channels extends from the internal cavity towards the first opening or the second opening.