

Dynamic Capacity of Desiccants Based on Modified Alumina at High Pressure
https://doi.org/10.18412/1816-0387-2016-5-6-13
Abstract
Alumina desiccants prepared by extrusion of plastic pastes based on pseudoboehmite- and bayerite-containing hydroxides, including the ones modified with sodium and potassium ions, were studied. The hydroxides were synthesized via dehydration of the product of centrifugal thermal activation of hydrargillite under mild conditions. Physicochemical and structural-mechanical properties of the desiccants were characterized using fresh samples and the samples undergone 9 adsorption-regeneration cycles. The dynamic capacity was determined at 3 MPa under industrial-modeling conditions. A high dynamic capacity was characteristic of the sample prepared from bayerite-containing hydroxide against that of the sample prepared from pseudoboehmite-containing hydroxide, while close textural and strength parameters were determined for both adsorbents. After the sample prepared from pseudoboehmite-containing hydroxide was modified with sodium and potassium ions, the granules became less strong, volume and average size of pores increased, and dynamic capacity rose. At a low water content in the gas to be dried the dynamic capacity of the potassium modified sample was not inferior to that of the sample prepared from bayerite-containing hydroxide. The phase composition, content of alkali impurities, specific surface area and crashing strength did not change, within the measurement error, after cyclic testing of the samples. A high stability of the prepared desiccants and the possibility of achieving the minimal dew point (–80 °C) was established during repeated adsorption-desorption cycles.
About the Authors
R. A. ZotovRussian Federation
L. A. Isupova
Russian Federation
V. V. Danilevich
Russian Federation
A. A. Babina
Russian Federation
A. N. Sinel’nikov
Russian Federation
E. P. Meshcheryakov
Russian Federation
I. A. Kurzina
Russian Federation
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Review
For citations:
Zotov R.A., Isupova L.A., Danilevich V.V., Babina A.A., Sinel’nikov A.N., Meshcheryakov E.P., Kurzina I.A. Dynamic Capacity of Desiccants Based on Modified Alumina at High Pressure. Kataliz v promyshlennosti. 2016;16(5):6-13. (In Russ.) https://doi.org/10.18412/1816-0387-2016-5-6-13