The present invention concerns the use, for gas separation and/or gas drying, of at least one zeolite adsorbent material comprising at least one type A zeolite, said adsorbent having an external surface area greater than 20 m.sup.2.Math.g.sup.1, a non-zeolite phase (PNZ) content such that 0<PNZ30%, and an Si/Al atomic ratio of between 1.0 and 2.0. The invention also concerns a zeolite adsorbent material having an Si/Al ratio of between 1.0 and 2.0, a mesoporous volume of between 0.07 cm.sup.3.Math.g.sup.1 and 0.18 cm.sup.3.Math.g.sup.1, a (VmicroVmeso)/Vmicro ratio of between 3 and 1.0, non-inclusive, and a non-zeolite phase (PNZ) content such that 0<PNZ30%.

Embodiments of the present disclosure are directed to methods for recycling waste ion exchange materials comprising a first alkali metal salt and a second alkali metal salt comprising reducing the size of the waste ion exchange materials to produce a plurality of waste ion exchange particles having particle sizes from 0.10 mm to 5.0 mm, and regenerating the plurality of waste ion exchange particles to produce a plurality of regenerated ion exchange particles having a concentration of the first alkali metal salt greater than a concentration of the first alkali metal salt in the waste ion exchange materials. Systems for recycling a waste ion exchange materials comprising a first alkali metal salt and a second alkali metal salt are also disclosed.

Embodiments of the present disclosure are directed to methods for recycling waste ion exchange materials comprising a first alkali metal salt and a second alkali metal salt comprising reducing the size of the waste ion exchange materials to produce a plurality of waste ion exchange particles having particle sizes from 0.10 mm to 5.0 mm, and regenerating the plurality of waste ion exchange particles to produce a plurality of regenerated ion exchange particles having a concentration of the first alkali metal salt greater than a concentration of the first alkali metal salt in the waste ion exchange materials. Systems for recycling a waste ion exchange materials comprising a first alkali metal salt and a second alkali metal salt are also disclosed.

Processes for producing germanium-68 from a gallium target body are disclosed. In some embodiments, germanium-68 and gallium are precipitated to remove metal impurities. Germanium-68 and gallium are re-dissolved and loaded onto an ion exchange column to separate germanium-68 from gallium.

Processes for producing germanium-68 from a gallium target body are disclosed. In some embodiments, germanium-68 and gallium are precipitated to remove metal impurities. Germanium-68 and gallium are re-dissolved and loaded onto an ion exchange column to separate germanium-68 from gallium.

A system and method for the reduction of NOx and CO contaminants using an ion-exchange resin media having lower-valency ions of the transitional metal elements, such as ferrous ions, cuprous ions and/or manganese ions, such that gases containing NOx and/or CO contaminants may be passed over the media so that the contaminants are absorbed by the lower-valency ions of the transitional metal elements, the media configured so that it can be regenerated to remove the NOx and/or CO contaminants. Regeneration includes exposing the media to a heated stream of hydrogen gas or exposing the media to hydrogen ions in an electrochemical cell.

A system and method for the reduction of NOx and CO contaminants using an ion-exchange resin media having lower-valency ions of the transitional metal elements, such as ferrous ions, cuprous ions and/or manganese ions, such that gases containing NOx and/or CO contaminants may be passed over the media so that the contaminants are absorbed by the lower-valency ions of the transitional metal elements, the media configured so that it can be regenerated to remove the NOx and/or CO contaminants. Regeneration includes exposing the media to a heated stream of hydrogen gas or exposing the media to hydrogen ions in an electrochemical cell.

Proposed is an inorganic ion-exchanger, which is selective to lithium and constituted a non-stoichiometric compound in the form of solid particles of a polymeric aqua-oxo-hydroxo complex represented by the following general formula: H.sub.aNbO.sub.(2.5+0.5.Math.a).cZrO.sub.2.dH.sub.2O, wherein: a is a number ranging from 0.5 to 1.5, c is a number ranging from 0.01 to 1.0, and d is a number ranging from 0.1 to 2.0. The complex has a total ion exchange capacity of at least 3.5 meq/g and an ion-exchange capacity specifically to lithium of at least 2.5 meq/g. This ion-exchanger is intended for selective extraction of lithium from lithium-containing natural and industrial brines.

Proposed is an inorganic ion-exchanger, which is selective to lithium and constituted a non-stoichiometric compound in the form of solid particles of a polymeric aqua-oxo-hydroxo complex represented by the following general formula: H.sub.aNbO.sub.(2.5+0.5.Math.a).cZrO.sub.2.dH.sub.2O, wherein: a is a number ranging from 0.5 to 1.5, c is a number ranging from 0.01 to 1.0, and d is a number ranging from 0.1 to 2.0. The complex has a total ion exchange capacity of at least 3.5 meq/g and an ion-exchange capacity specifically to lithium of at least 2.5 meq/g. This ion-exchanger is intended for selective extraction of lithium from lithium-containing natural and industrial brines.

The present invention relates to the extraction of lithium from liquid resources, such as natural and synthetic brines, leachate solutions from clays and minerals, and recycled products.