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US 11,529,582 B2Granted
Tunable adsorbents
AssigneePraxair Technology, Inc.
InventorsSteven J. Pontonio, Neil A. Stephenson, Philip A. Barrett, Nicholas R. Stuckert
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AssigneePraxair Technology, Inc.
InventorsSteven J. Pontonio, Neil A. Stephenson, Philip A. Barrett, Nicholas R. Stuckert
Estimating the term…
The present invention relates to a method for modifying the crystalline inorganic framework of an adsorbent with coatings to provide rate selectivity for one gas over others is described. The method described herein narrows the effective pore size of crystalline porous solids with pores less than about 5 Å for rate selective separations. This method of the invention comprises treating the hydrated or partially hydrated zeolite with a silicone derived binding agent followed by subsequent heat treatment. The additive content and treatment are adjusted to match effective pore size to specific separations. The superior adsorbent has the added convenience of bead forming simultaneously with pore modification as well as having the treatment result in the yielding of high crush strength products.
A surface modified A-type zeolite adsorbent having a starting effective pore size of less than or equal to 4.1 Å wherein the starting pore size of said zeolite is reduced by 0.1 up to about 1.2 Å with a coating comprised of a silicone derived species, wherein said species is derived from a silicone precursor of formula I:
An adsorbent composition for separation of at least 2 gases or liquids wherein there is a size difference between the molecules of said gases or liquids to be separated of 0.8 Å or less, wherein said adsorbent composition is an agglomerated product comprising a surface modified A-type zeolite adsorbent having a starting effective pore size of less than or equal to 4.1 Å wherein the starting pore size of said zeolite is reduced by 0.1 up to about 1.2 Å with a coating comprised of a silicone precursor selected from polydimethylsiloxanes, polydiphenylsiloxanes, octyl silsesquioxanes methyl silsesquioxanes, (2,4,4-trimethylpentyl) triethoxysilane and mixtures thereof, wherein said adsorbent has a particle size of from 0.5-5 mm and a crush strength of at least 0.7 lbF.
Dependencies are inferred from the claim text.