lithium exchanged zeolites, process for their manufacture and their use as absorbent for nitrogen in the luftzerlegung

摘要

Production of cation-exchanged low-silicon X zeolites comprises contacting an aqueous slurry of the zeolite with one or more solutions of di- and/or trivalent metal compounds in a high-speed mixer and cation-exchanging the product with lithium. Production of cation-exchanged X zeolites having a silicon/aluminum atomic ratio of less than 1.5, in which 50-95% of the exchangeable cations are lithium, 4-50% are trivalent cations selected from aluminum, scandium, gallium, iron, chromium, indium, yttrium and lanthanides and/or divalent cations selected from calcium, strontium, zinc, copper, chromium, iron, manganese, nickel and cobalt, and 0-15 are residual ions selected from sodium, potassium, ammonium and hydrogen, comprises contacting an aqueous slurry of the zeolite with one or more solutions of di- and/or trivalent metal compounds in a high-speed mixer and cation-exchanging the product with lithium.