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Chemiewerk Bad Kostritz Gmbh

Baldur Unger

Alfons Brandt

Frank R Fitch

Adeola Florence Ojo

Martin B&uuml;low

Hartmut Tschritter

Jens Schmeisser

Uwe Henkel

Gojdár Bálint

Dietmar Gruhle

Georg Winterstein

The invention relates to a X-zeolite based adsorbent granulate with faujasite structure and a molar SiO/AlOratio of &#x2267;2.1-2.5, wherein the granulate has an average transport pore diameter of &#x3e;300 nm and a negligible fraction of meso-pores and wherein the mechanical properties of the granulate are at least the same as or better than the properties of an X-zeolite based granulate formed using an inert binder and the equilibrium adsorption capacities for water, COand nitrogen are identical to those of pure X-zeolite powder with a similar composition.

Adsorbent granulate and method for the manufacture thereof

Nitrogen oxides and low molecular weight hydrocarbons are removed from air by subjecting the air to a temperature swing adsorption process using as the adsorbent a composite zeolite product containing both zeolite type A and zeolite type X. The composite zeolite product is prepared by crystallizing a sodium ion- or sodium ion- and potassium ion-containing alumina-silica hydrogel under conditions which result in the production of a zeolitic composite which contains both zeolite type A and zeolite type X crystal domains. In a preferred embodiment, calcium ions constitute a substantial number of the composite's exchangeable cations and the type X portion of the composite zeolite product has a silicon-to-aluminum atomic ratio in the range of 0.9 to less than 1.15. The nitrogen oxide- and hydrocarbon-selective adsorbent can be incorporated into an atmospheric air prepurification plant downstream of a water vapor-selective adsorbent and a carbon dioxide-selective adsorbent.

Temperature swing adsorption process

Zeolites exchanged with lithium cations and polyvalent cations are prepared by first partially ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with polyvalent cations, then heat-treating the partially polyvalent cation-exchanged zeolite, then ion exchanging the heat-treated zeolite with ammonium cations, and then reacting the ammonium cation-exchanged zeolite with a water-soluble lithium compound under conditions which result in the removal of ammonia from the reaction zone.

Method of manufacture of multicationic molecular sieves

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Dessau, Germany

Baldur Unger