日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

The combination of high selectivity and high capacity for light acid gases with their low reactivity and heat of adsorption make modified activated alumina especially suitable for the purification of olefin streams. Alternatively, molecular sieves have a high capacity for polar molecules. Ideally, one adsorbent would exhibit the properties of both modified activated alumina and zeolitic adsorbents. Such an adsorbent is Union Showa / UOP's AZ-300, hybrid adsorbent, a homogenous combination of modified activated alumina and Zeolite Molecular Sieve (ZMS) adsorbents that takes advantage of the complementary performance characteristics of both materials. It has reduced reactivity and high capacity for light acid gases as well as a broad range of polar molecules.

Though the AZ-300 hybrid adsorbent contains ZMS, it does not require a "preloading step" when processing olefin streams. The elimination of the "preloading step" without sacrificing of the effective removal of polar compounds provides the olefins producer and polymer manufacturer with tremendous process and competitive advantages. The unique AZ-300 hybrid adsorbent enables the processor to consider using a single product for the adsorptive removal of a broad range of contaminants. The broad capability of the AZ-300 hybrid adsorbent is of particular benefit during periods of intermittent and fluctuating levels of unanticipated contaminants.