▎ 摘　　要

NOVELTY - Removing carbon dioxide from a carbon dioxide-containing gas comprising water vapor, comprises: (a) contacting the carbon dioxide-containing gas comprising water vapor with an alkali metal carbonate adsorbent under conditions causing (i) the water vapor in the carbon dioxide-containing gas comprising water vapor to react with the alkali metal carbonate to form a corresponding alkali metal carbonate hydrate, and (ii) the corresponding alkali metal carbonate hydrate to react with carbon dioxide in the carbon dioxide-containing gas comprising water vapor to form a corresponding alkali metal sesquicarbonate; and (b) reacting the corresponding alkali metal sesquicarbonate under conditions effective to recover carbon dioxide and to regenerate alkali metal carbonate hydrate adsorbent from it. USE - The process is useful for removing carbon dioxide from a carbon dioxide-containing gas comprising water vapor. ADVANTAGE - The process: has been benefits of support of alkali metal carbonate sorbent enables reduction in the reaction temperature for desorption or regeneration; provides large-scale production of these types of sorbents at volumes needed to make them practical for gigaton-level removal of carbon dioxide; and utilizes sorbent materials that can effectively capture carbon dioxide from air at ambient conditions in the presence of moisture, can be regenerated with reasonable desorption energy requirements, can operate effectively for 3-5 years of continuous adsorption-regeneration cycles, are relatively inexpensive, are abundantly available to address gigaton/year carbon dioxide removal requirements, can be readily implemented in process systems using existing manufacturing infrastructure and are environmentally benign and improved capture of carbon dioxide from gases. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for system for removal of carbon dioxide from a carbon dioxide-containing gas comprising water vapor, the system comprising a reactor, a source of carbon dioxide-containing gas comprising water vapor, arranged in feed relationship to the reactor, an alkali metal carbonate adsorbent in the reactor, a regeneration assembly arranged to selectively regenerate the alkali metal carbonate adsorbent after carbon dioxide-removal reactions of the alkali metal carbonate adsorbent, and a control assembly arranged to operate the reactor in an operation comprising the (a)-(b), where the control assembly actuates the regeneration assembly for regeneration according to a predetermined operational condition.