Calculation of the adsorption equilibrium parameters of inert gases and their binary mixtures on zeolite NaX

Conclusions

• 1. The adsorption isotherms of krypton, xenon, and nitrogen in the 140–270K temperature range and the 0.3 Pa-65 kPa pressure range were calculated with the equations from a quasi-chemical model of adsorption.

• 2. The phase diagrams of krypton-xenon adsorption solutions for 170 and 220 K were plotted for a binary mixture of gases. The limit of applicability of the given model was substantiated, and its drawbacks were noted.

  

  Fig. 1. Adsoprtion isotherms of Kr, Xe (a) and N₂ (b) at T, K: 1) 170, 2) 220, 3) 235,4) 160. Points: experimental; lines: calculated.

  

  Fig. 2. Diagrams of equilibrium adsorption solutions of Kr-Xe for T, K: a) 170, b) 220, and with P_tot, kPa: 1) 20, 2) 14, 3) 50, C_Xe(Kr): adsorption, atoms/cavity. Points: experimental: lines: calculated.

• 3. The equations of the quasichemical model can be successfully used in engineering calculations of adsorption systems with properties similar to the Kr-Xe-NaX system in the range of degrees of filling of 0.01 ≲ θ₁ ≤ 0.50 and 0.10 ≤ θ₂ ≤ 0.70.