	US 7,537,742 B2
	Process and adsorbent for hydrogen purification
Mohamed Safdar Allie Baksh, Amherst, N.Y. (US); Mark William Ackley, East Aurora, N.Y. (US); and Frank Notaro, Amherst, N.Y. (US)
Assigned to Praxair Technology, Inc., Danbury, Conn. (US)
Appl. No. 10/540,506 PCT Filed Dec. 22, 2003, PCT No. PCT/US03/40797 § 371(c)(1), (2), (4) Date May 12, 2006, PCT Pub. No. WO2004/058630, PCT Pub. Date Jul. 15, 2004.
Prior Publication US 2006/0254425 A1, Nov. 16, 2006
Int. Cl. B01D 53/04 (2006.01)

U.S. Cl. 423—230 [502/408; 502/410; 502/415; 423/239.1; 423/245.1; 423/247]

10 Claims

1. An adsorbent bed comprising:

a) a first layer of adsorbent adapted for the removal of water;

b) a second layer of adsorbent comprising a mixture of adsorbents, wherein at least one component of the said mixture has a bulk density of greater than or equal to 32 lb/ft³;

c) a third layer of adsorbent comprising an adsorbent having a bulk density of greater than or equal to 32 lb/ft³; and

d) a fourth layer of adsorbent having a N₂Henry's Law constant of greater than 1.5 mmol/g.bar.