ENERGY EFFICIENT REMOVAL OF CO2 FROM AIR BY INTEGRATING WITH H2 GENERATION

摘要

To provide a method and system for removing carbon dioxide from an atmosphere using water electrolysis, which produces hydrogen.SOLUTION: A system has an alkaline capture stream, an alkaline depleted stream, a carbon dioxide removal unit operation having a return stream, and a series of electrolyzers, each electrolyzer to receive a carbon dioxide-rich input stream and produce an acidified output stream, and to receive a return stream and produce a basified output stream that is more alkaline than the input return stream. A method of removing carbon dioxide from an atmosphere and generating hydrogen includes: capturing carbon dioxide from an atmosphere in an alkaline capture solution; sending the carbon dioxide-rich alkaline solution to a series of electrolyzers in a carbon dioxide -rich path; removing carbon dioxide from the acidified carbon dioxide-rich solution at a removal unit to produce a carbon dioxide-poor solution; sending the carbon dioxide-poor solution to the series of electrolyzers in a return path; and returning the return solution to the alkaline capture stream.SELECTED DRAWING: Figure 1