IMPROVED MATERIALS FOR DIRECT AIR CAPTURE AND USES THEREOF
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United States of America Patent
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Issued Date -
Jan 4, 2024
app pub date -
Nov 30, 2021
filing date -
Dec 18, 2020
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Abstract
A method for separating gaseous carbon dioxide from air is proposed by cyclic adsorption/desorption using a sorbent. The method includes the following sequential and in this sequence repeating steps: (a) contacting air with the sorbent to allow gaseous carbon dioxide to adsorb on the sorbent under ambient atmospheric pressure and temperature conditions; (b) isolating the sorbent from the flow-through; (c) inducing an increase of the temperature of the sorbent; (d) extracting the desorbed gaseous carbon dioxide from the unit and separating gaseous carbon dioxide from steam/water; and (e) bringing the sorbent to ambient atmospheric temperature and pressure conditions. The sorbent is a water retaining and/or porous support which before use in the cyclic process has been impregnated or wetted with a solution of a secondary amine compound and the sorbent is loaded by said secondary amine compound by at least 5% by weight.
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