Zeolite adsorbents, method for obtaining them and their use for removing carbonates from a gas stream
AssigneeCeca S.A.
InventorsMarie-Therese Grandmougin, Francis Mayolet, Jacques Rouet
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Abstract
The present invention relates to a novel family of zeolite adsorbents comprising a mixture of zeolite X and zeolite LSX, these adsorbents being predominantly exchanged with sodium or with strontium. These adsorbents are particularly suited to the decarbonatation of gas flows contaminated by CO2.
Claims26
Process for purifying air contaminated by CO2 and H2O, wherein gas flow to be purified is brought into contact, in an adsorption region, with at least one drying agent, and at least with one adsorbent
- composed essentially of a mixture of zeolite X and zeolite LSX, the overall degree of exchange with sodium of which is equal to or greater than 98%,
- agglomerated with a binder, the residual amount of inert binder in the adsorbent being less than or equal to 25 parts by weight per 100 parts by weight of mixture of zeolites and of binder,
- and with a water content advantageously representing at most 1% of the total weight of the adsorbent.
Zeolite adsorbent comprising a mixture of 5% to 95% by weight of at least one zeolite X with an Si/Al ratio equal to 1.25 and of 95 to 5% by weight of at least one zeolite LSX with Si/Al=1 wherein
- either at least 80% of the sum of the exchangeable cationic sites of all of the zeolites of the mixture are occupied by sodium cations,
- or at least 70% of the sum of the exchangeable cationic sites of all of the zeolites of the mixture are occupied by strontium cations,
- the remainder of the exchangeable sites to be occupied by cations selected from Groups IA, IIA and IIIA of the Periodic Table or trivalent ions from the rare earth or lanthanide series.
Dependencies are inferred from the claim text.