US 12,247,782 B2
Pre-purification arrangement for air separation and method of hybrid air purification
Gowri Krishnamurthy, Sellersville, PA (US); Dingjun Wu, Macungie, PA (US); and Nasim Ul Hassan Malik, London (GB)
Assigned to AIR PRODUCTS AND CHEMICALS, INC., Allentown, NJ (US)
Filed by Air Products and Chemicals, Inc., Allentown, PA (US)
Filed on Sep. 23, 2021, as Appl. No. 17/482,826.
Prior Publication US 2023/0087673 A1, Mar. 23, 2023
Int. Cl. B01D 53/04 (2006.01); B01D 53/047 (2006.01); B01D 53/26 (2006.01); F25J 3/04 (2006.01)
CPC F25J 3/04242 (2013.01) [B01D 53/0407 (2013.01); B01D 53/0462 (2013.01); B01D 53/047 (2013.01); B01D 53/261 (2013.01); B01D 2257/108 (2013.01); B01D 2257/404 (2013.01); B01D 2257/502 (2013.01); B01D 2257/504 (2013.01); B01D 2257/702 (2013.01); B01D 2257/80 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of operating a pre-purification unit (PPU) of an air separation unit (ASU) system, the method comprising:
purifying air fed to the PPU via a first adsorber of the PPU while the ASU system operates within a first pre-selected operational capacity in which the air fed to the PPU is at a first feed rate that is at or below a first pre-selected feed rate; and
in response to an increase in the operational capacity of the ASU system to a level that is above the first pre-selected operational capacity such that the air fed to the PPU is fed at a second feed rate that is above the first feed rate, purifying the air fed to the PPU via the first adsorber of the PPU and a second adsorber of the PPU, the second adsorber of the PPU being different from the first adsorber of the PPU.