Hollow‐fiber‐based adsorbers for gas separation by pressure‐swing adsorption

Abstract

Hollow-fiber-based adsorbers for gas separation by pressure-swing adsorption (PSA) was studied experimentally. The high efficiency of hollow-fiber-based adsorbers for gas .separation was illustrated by hydrogen separation using fine-powder-activated carbon and molecular sieve as adsorbents. The adsorption equilibrium and dynamics of the hollow-fiber adsorbers were determined. The pressure drop of the gas flowing through the adsorbers was also examined. The adsorbers were tested for hydrogen separation from nitrogen, carbon dioxide, and a multicomponent gas mixture simulating ammonia synthesis purge gas. The PSA systems using the hollow-fiber adsorbers were uely effectiue for hydrogen purification. The high separation efficiency is derived from the fast masstransfer rate and low pressure drop, two key features of hollow-fiber-based adsorbers.

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“…Extrusion, treating HCl followed by water vapor treatment and pyrolysis in two steps at 600-1000 • C and compaction at 1200-2000 • C are the processes used in their production [10]. Microporous polypropylene hollow fibers filled with adsorbent particles have been successfully used separating hydrogen from nitrogen and carbondioxide [11]. Preliminary results of hollow fiber formation from water glass and metal salts and characterization of dried fibers study were reported by Balköse et al [12].…”

Electrical swing adsorption on functionalized hollow fibers

“…Generally, adsorption columns use packed beds with inherent limitations such as a high mass transfer resistance [32], a high heat transfer resistance as well as undefined flow conditions. Fibrous sorbents promise to overcome fundamental shortcomings of TSA processes [33][34][35]. Feng et al [33] were the first to introduce a hollow fiber geometry which resulted in a lower pressure drop and a lower mass transfer resistance.…”

“…Fibrous sorbents promise to overcome fundamental shortcomings of TSA processes [33][34][35]. Feng et al [33] were the first to introduce a hollow fiber geometry which resulted in a lower pressure drop and a lower mass transfer resistance. Controlled flow conditions in the laminar regime led to sharper breakthrough curves and thus higher recoveries [33].…”

Novel adsorbent hollow fibres for oxygen concentration

“…For this reason state of the art medical oxygen concentrators such as that invented by Appel et al (2004) now contain small zeolite beads (such as Zeochem Z12-07 LiLSX beads with a size distribution of 0.4-0.8 mm). Appropriate bead size is related to the bed size, with larger commercial fixed bed PSA devices generally having a bead size larger than 2-3 mm in equivalent diameter (Feng et al 1998).…”