PSA and VPSA: Mostly Use Lithium Zeolite and Sodium Sieve

medical granular zeolite oxygen sieve production

Molecular sieve is a crucial adsorbent in the technology of pressure swing adsorption air separation oxygen production. Molecules whose molecular diameter is smaller than the sieve pores of zeolite molecular sieves can enter the pores, but they can still use different molecular polarities, unsaturation, and polarization rates，the difference in adsorption strength and diffusion rate caused by spatial configuration and so on separates gas molecules. This is because the zeolite composed of cations and the negatively charged silico-alumina framework is itself a polar substance, which can polarize molecules through electrostatic induction. Therefore, the more polar, or the more easily polarized molecules, the easier it is to be adsorbed.

Zeolite molecular sieve has high adsorption capacity at low adsorbate concentration (or high adsorption temperature). The reason is that its adsorption properties are different from other adsorbents. For example, the adsorption force of activated carbon is a function of dispersion forces, while zeolite molecular sieve not only has a function of dispersion force but also has a large electrostatic force. Since the crystal cavity of the zeolite molecular sieve contains cations, and the stock oxygen is negatively charged, a strong local positive electric field is generated around the cations. Due to the combined effect of the two, zeolite molecular sieves have a particularly strong adsorption capacity.

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