FIELD: sorbents and gas treatment. SUBSTANCE: adsorbent for isolation of nitrogen from gas, containing at least one non-nitrogen gas with molecule size equal to or greater than that of methane molecule, consists of clinoptilolite containing sodium ions in number equal to at least 17 equivalent % based on total number of ion-exchange cations and optionally non-univalent cations of one or several types which, when present, constitute 12 equivalent % based on number of ion-exchange cations and balance, if any, is constituted by univalent non-sodium cations of at least one type. EFFECT: increased selectivity and capability to be regenerated. 9 cl, 3 tbl, 8 ex
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