Device, system, and method for carbon dioxide capture in humid conditions

A method for carbon dioxide capture, comprising:

• receiving a process vapor into a vessel through a vapor intake at an intake pressure, the process vapor comprising water vapor and carbon dioxide gas, the vessel comprising a desiccant and a CO2 sorbent material;
• passing the process vapor through the desiccant and the CO2 sorbent material, the desiccant absorbing at least a portion of the water vapor in the process vapor resulting in a dry vapor, the CO2 sorbent material absorbing carbon dioxide from the dry vapor resulting in a CO2-lean dry vapor, the portion of the water vapor absorbed by the desiccant being large enough that the CO2 sorbent material absorbs carbon dioxide from the dry vapor uninhibited by a remaining water;
• discontinuing the process vapor by closing the vapor intake;
• desorbing the water from the desiccant by at least one of reducing a first pressure downstream from the desiccant to below the intake pressure and increasing a temperature of the desiccant;
• desorbing the carbon dioxide from the CO2 sorbent material by placing the water desorbed from the desiccant in direct contact with the CO2 sorbent material;
• removing the desorbed carbon dioxide through the product outlet as a product stream;
• and
• desorbing the remaining water from the desiccant and the CO2 sorbent material.

A system for carbon dioxide capture, comprising:

• a plurality of CO2 capture devices, each device comprising:
• a desiccant;
• a CO2 sorbent material;
• and
• a vessel enclosing the desiccant and the CO2 sorbent material, the vessel comprising a vapor intake and a product outlet;
• wherein the device is configured to cycle between a first phase, a second phase, and a third phase;
• wherein the first phase comprises a process vapor comprising water vapor and carbon dioxide gas being received into the vessel through the vapor intake at an intake pressure, the process vapor passing through the desiccant and the CO2 sorbent material, the desiccant absorbing at least a portion of the water vapor in the process vapor resulting in a dry vapor, the CO2 sorbent material absorbing carbon dioxide from the dry vapor resulting in a CO2-lean dry vapor, the portion of the water vapor absorbed by the desiccant being large enough that the CO2 sorbent material absorbs carbon dioxide from the dry vapor uninhibited by a remaining water;
• wherein the second phase comprises the vapor intake being closed and at least one of a first pressure downstream from the desiccant being reduced below the intake pressure and a temperature of the desiccant being increased, resulting in the desorption of water from the desiccant and the desorption of carbon dioxide from the CO2 sorbent material in response to the water desorbed from the desiccant being in direct contact with the CO2 sorbent material, the second phase further comprising a CO2-rich product stream being removed through the product outlet;
• and
• wherein the third phase comprises the remaining water being desorbed from both the desiccant and the CO2 sorbent material as recovered water.