Yang et al. (1997) gives isotherm data for adsorption of methane on zeolite 5A in the presence of hydrogen:

It has been determined that a four-bed PSA plant using this adsorbent can be used to purify a stream containing 40%
CH₄ in H₂ to give 90% recovery of hydrogen at purity 99.99 mol%. The adsorption time is 300s and the beds are 85%
loaded at the end of the adsorption step. If the feed gas is available at 25 atm and the off-gas can be discharged at 2
atm, then estimate the amount of adsorbent per bed and the dimensions of each adsorbent vessel for a feed rate of
1000 kmol/h.

Data (Yang et al., 1997): Adsorbent bulk density = 795 kg/m³.

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Pressure (atm) Adsorbed amount (mmol/g) 0 0.0 1.5 0.4 2.5 0.7 4.5 1.0 6.5 1.25 9 1.45 12.5 1.6 16.5 1.7 19.5 1.75