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Experimental investigation on hygroscopic kinetics and regeneration behavior of silica gel-modified molecular sieve composite desiccant
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DOI：10.1007/s10934-026-01922-1.png)
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Abstract
En 中文
To address the stringent humidity control requirements of high-end manufacturing sectors such as lithium batteries and biopharmaceuticals, which demand dew point temperatures below -40 degrees C, this study investigates the moisture adsorption characteristics and regeneration mechanisms of silica-based composite 5A molecular sieve (SG-5A MS) under high-humidity inlet conditions through experimental and theoretical analysis. Utilizing scanning electron microscopy (SEM), nitrogen adsorption-desorption, and thermogravimetric analysis, combined with static adsorption, dynamic mass transfer, and cyclic regeneration experiments, the study systematically elucidates the influence of the material's microstructure on its deep dehumidification performance. Results demonstrate that SG-5A MS achieves an ultra-low dew point temperature output of -81.68 degrees C under high-humidity inlet conditions through synergistic interaction between silica gel and molecular sieve. Its dynamic adsorption rate reaches 30.6622%, significantly outperforming either silica gel or molecular sieve alone. After 10 regeneration cycles at 118 degrees C, it maintained high adsorption capacity, meeting industrial-grade humidity control requirements. The study investigated the relationships between pore structure, moisture absorption performance, and regeneration stability as variables changed. It proposed material selection and process optimization strategies suitable for deep dehumidification in high-humidity environments, providing theoretical support for designing low-dew-point rotary desiccant dehumidification systems in fields such as lithium battery electrode sheet production and pharmaceutical freeze-drying.
Keywords:
Silica gel-based 5A molecular sieve composite
Pore structure
Regeneration stability
Low dew point air
Journal
IF:
3.2
Papers:
154
Citations:
5.0K