Measurement of Breakthrough Curves on Pressure Swing Adsorption for Hydrogen Isotope Separation

Verification of hydrogen isotope separation by pressure swing adsorption process: Successive volume reduction of isotopic gas mixture using SZ-5A column

“…As has been mentioned, the adsorption process in the 1st cycle is to be longer than in the other cycles because of no tracer residual in the column. The 1st cycle experimental adsorption process, however, was shortened compared with the estimation from breakthrough curves measured in previous works [11][12][13][14][15]. Probably, the cause was in a lack of cooling time, that is, the column was not enough at 77.4 K when starting the initial operation.…”

Recent Progress in Functional Nanomaterials towards the Storage, Separation, and Removal of Tritium

“…[165] To effectively separate hydrogen isotopes under cryogenic conditions (77.4 K), Kotoh et al developed a pressure swing adsorption (PSA) system in which tritium was treated as gaseous hydrogen. [166] They carried out fundamental experiments of adsorption and desorption of a tracer D 2 in bulk H 2 with Zeolite 5A-/Zeolite 13X-packed columns to separate hydrogen isotopes. The hydrogen isotope adsorption experiments on 5A and 13X zeolites exhibited quantitative advantages in the order T 2 , DT, D 2 , HT, HD, and H 2 , and the isotope adsorption difference depended on the hydrogen isotope ZPE difference at 77 K. [167] The experiments revealed that heavier isotopes predominantly adsorbed at the liquid nitrogen temperature.…”

Breakthrough curves of non-trace H2–D2 mixture replacement adsorption with SZ-13X packed column at 77.4K

“…In previous works [1][2][3][4][5][6][7][8], they clarified dynamic behaviors of trace one in H 2 -D 2 (99:1) mixtures in zeolite packed columns from the breakthrough curve analysis. The tracer curves can be analytical because assumptions are acceptable of ignoring the fluid outflow-rate change with breakthrough concentration variation and the change of isotope separation factor in binary component adsorption equilibrium depending on concentration.…”