The hydrophobic (water-repellent) molecular sieves Wessalith(r) DAY and Wessalith DAZ are two products used for air and gas purification. Both are frequently chosen for the adsorption of organic solvents in humid atmospheres. Wessalith DAY, having a pore diameter of 0,8 nm, is well suited for the adsorption of conventional solvents. For the removal of solvents with lower molecular weight, Wessalith DAZ having smaller pore sizes (0,6 nm) is used. Both types of zeolites have complementary properties in their effectiveness. Due to their high silicon to aluminium ratio, both zeolites exhibit excellent chemical resistance to acid media, and are also stable up to 1000 °C. To meet different process requirements Wessalith DAY and Wessalith DAZ are available as powder as well as in pellet form. They are used with great success for the removal of solvents from polluted air, in smoothing filters and in combination with catalytic/thermal combustion processes.
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