Granulated zeolites without binding agents – synthesis and properties

Abstract

For the first time the authors summarized published over the last 15–20 years, information on the synthesis and the main indicators of quality – the degree of crystallinity, adsorption capacity of H2O, RSH, H2S, CO2 and C6H6, as well as the mechanical strength of zeolites A and X without a binder, which granules are uniform aggregates of crystals. The ways for their synthesis are considered. A comparison of these indicators of crystalline aluminosilicate micro-, meso-and macroporous materials with zeolite adsorbents with bonding materials. It is shown that granulated zeolites A and X without a binder in the adsorption capacity and mechanical strength are superior to analogues with binding materials, widely used in adsorption processes. Most of the developed methods for preparing of these zeolite materials had pilot testing, and some have already been introduced at «Salavat Catalyst Plant» (Synthetic Zeolites: NaA-BS STO 05766575-109-2008, KA-BS TU 2161-126-05766575-2005) , at «Ishimbai specialized chemical plant of catalysts» [CaA-V (5A), TU 2163-004-05766557-97, zeolite KA-I (improved) (3A), TU 2163-006-05766557-98, zeolite NaA-I (improved ) (4A), TU 2163-003-05766557-97] and at «Plant of molecular sieves “Real Sorb”» (TU 2163-005-21742510-2004 NaA, KA-NPG TU 2163-009-21742510-2005, NPG-CaA TU 2163-006-21742510-2004). The main directions of research for this area in the near future are formulated.