Electrodialytic separation of CO₂gas from seawater

摘要

A method comprises flowing process solution and electrode solution into a BPMED apparatus, applying a voltage such that the process solution is acidified and basified and dissolved CO2 is generated, flowing the process solution out of the apparatus, and desorbing CO2 out of the process solution. A method for desorbing CO2 from an ocean comprises flowing seawater and electrode solution into a BPMED apparatus, applying a voltage such that dissolved CO2 is generated, flowing the seawater out of the apparatus, and desorbing CO2 out of the seawater. A method for producing a desalted solution and CO2 gas comprises flowing process solution and electrode solution into a BPMED apparatus that includes one or more three-compartment cells, applying a voltage such that the process solution is acidified, basified, and desalted, flowing the process solution out of the apparatus, and desorbing CO2 out of the process solution.

主权项

1. A method comprising:
flowing a process solution into a BPMED system with a BPMED apparatus having at least two compartments separated by membranes, wherein the process solution is one of a seawater solution, a brine or water that has absorbed gaseous CO2; flowing an electrode rinse solution into the BPMED apparatus only across electrodes in the BPMED apparatus; applying a voltage to the BPMED apparatus and the process solution is acidified and basified, and dissolved CO2 is generated in the acidified process solution; flowing the acidified and basified process solution out of the BPMED apparatus; desorbing the CO2 out of the acidified process solution; combining the acidified and basified process solution such that the process solution is approximately neutral pH; and discharging the process solution from the BPMED system.