US 10,821,395 B2Granted

Electrochemical desalination system

AssigneePalo Alto Research Center Incorporated

InventorsEugene S. Beh, Divyaraj Desai, Michael Benedict, Jessica Louis Baker Rivest

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Abstract

An electrodialytic battery system comprises an electrodialysis apparatus having first and second reservoirs, wherein concentration of an input solution in the first reservoir increases and concentration of the input solution decreases in the second reservoir during an operation mode. A first redox-active electrolyte chamber comprises a first electrode and a first solution of a first redox-active electrolyte material and has a reversible redox reaction with the first electrolyte material to drive an ion into the first reservoir. A second redox-active electrolyte chamber comprises a second electrode and a second solution of a redox-active electrolyte material and has a reversible redox reaction with the second electrolyte material to accept an ion from the second reservoir. A first type of membrane is disposed between the first and second reservoirs, and a second type of membrane, different from the first type, is disposed between the respective electrode chambers and reservoirs.

Claims20

Dependent claims

A system, comprising:

an electrodialytic battery unit, comprising:
a first reservoir comprising an input and an output, wherein the concentration of a first input solution of at least one salt dissolved in a solvent is changed from a first concentration to a second concentration during an operation mode;
a second reservoir comprising an input and an output, wherein the concentration of a second input solution of at least one salt dissolved in a solvent is changed, from a third concentration to a fourth concentration, in the opposite manner as the first input solution in the first reservoir during the operation mode;
a first redox-active electrolyte chamber comprising at least one first electrode and a first solution of a redox-active electrolyte material and configured to have a reversible redox reaction with the first redox-active electrolyte material to drive at least one ion into, or accept at least one ion from, the first input solution having the first concentration in the first reservoir;
a second redox-active electrolyte chamber comprising at least one second electrode and a second solution of a redox-active electrolyte material and configured to have a reversible redox reaction with the second redox-active electrolyte material to accept at least one ion from, or drive at least one ion into, the second input solution having the third concentration in the second reservoir;
a first type of membrane disposed between the first and second reservoirs;
and
a second type of membrane, different from the first type, disposed between the first redox-active electrolyte chamber and the first reservoir and disposed between the second redox-active electrolyte chamber and the second reservoir.

5 more elements

A method for storing, or discharging, energy while separating solvent from a salt dissolved in the solvent, comprising:

providing an electrodialytic battery unit, comprising:
a first reservoir comprising an input and an output, wherein the concentration of an input solution of at least one salt dissolved in a solvent is changed from a first concentration to a second concentration during an operation mode;
a second reservoir comprising an input and an output, wherein the concentration of the input solution of at least one salt dissolved in a solvent is changed, from a third concentration to a fourth concentration, in the opposite manner as the input solution in the first reservoir during the operation mode;
a first redox-active electrolyte chamber comprising at least one first electrode and a first solution of a redox-active electrolyte material and configured to have a reversible redox reaction with the first redox-active electrolyte material to drive at least one ion into, or accept at least one ion from, the input solution having the first concentration in the first reservoir;
a second redox-active electrolyte chamber comprising at least one second electrode and a second solution of a redox-active electrolyte material and configured to have a reversible redox reaction with the second redox-active electrolyte material to accept at least one ion from, or drive at least one ion into, the input solution having the third concentration in the second reservoir;
a first type of membrane disposed between the first and second reservoirs;
and
a second type of membrane, different from the first type, disposed between the first redox-active electrolyte chamber and the first reservoir and disposed between the second redox-active electrolyte chamber and the second reservoir;
and
operating the electrodialytic battery unit in a first mode, generating a first output stream that is higher in concentration than the input solution, and a second output stream that is lower in concentration than the input solution.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/200,289Filed 26 Nov 2018 · us provisional application
Priority: 7 Feb 2018
Published: US 2019/0240623 A18 Aug 2019
Granted: 3 Nov 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification30 codes

B01D 53/1425
By absorption: regeneration of liquid absorbents
B01D 53/263
Drying gases or vapours: by absorption
B01D 61/423
Electrodialysis: comprising multiple electrodialysis steps
B01D 61/44
Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization: ion-selective electrodialysis