Co-formed base-treated aluminas for water and co2 removal

B - Operations – Transporting – 01 – J

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B01J 20/08 (2006.01) B01D 53/02 (2006.01) B01D 53/62 (2006.01) B01J 20/30 (2006.01)

Patent

CA 2553247

Base treated aluminas exhibit improved CO2 capacity over untreated aluminas. Base treated aluminas prepared by physically mixing alumina and base during forming have (1) a higher surface area, (2) less hydrothermal aging, (3) improved CO2 capacity and (4) lower cost than base treated aluminas produced by aqueous impregnation. A method for removing at least CO2 and water from a gas stream includes providing an adsorbent formed from a process comprising physically mixing activated alumina solids and solid salts of alkali metals, alkaline earth metals or ammonium ion; and contacting the gas stream with the adsorbent.

Divulgation d'alumines traitées par une base présentant une meilleure capacité de piégeage du CO2, comparativement à des alumines non traitées. Les alumines traitées par une base et préparées par mélange physique de l'alumine et de la base pendant le formage 1) ont une plus grande surface efficace, 2) résistent mieux au vieillissement hydrothermique, 3) ont une capacité accrue de piégeage du CO2 et 4) coûtent moins cher que des alumines traitées par une base et produites par imprégnation en milieu aqueux. Divulgation aussi d'une méthode d'élimination d'au moins le CO2 et l'eau d'un circuit de gaz comprend une étape de fourniture d'un adsorbant formé par un procédé comprenant le mélange physique de solides d'alumine activés et de sels solides de métaux alcalins, de métaux alcalino-terreux ou d'ammonium, et la mise en contact du circuit de gaz avec l'adsorbant.

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