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Molecular Sieve: High-Efficiency Adsorbent for Gas & Liquid Purification
Product introduction
Molecular sieves represent a class of highly effective adsorbents for gas and liquid processing. Their activated, uniform crystalline structure enables efficient removal of trace impurities from gaseous and liquid streams across industrial systems. Additionally, molecular sieves facilitate size-selective separation of gases and liquids based on molecular kinetic diameter.
A critical technical application is the anhydrous distillation of ethanol beyond its azeotropic point (95.6vol% ethanol–water mixture). Conventional distillation cannot break this azeotropic threshold; however, synthetic molecular sieves enable efficient ethanol dehydration via advanced adsorption technology to achieve ultra-dry ethanol specifications.
Technical Principle of Ethanol Dehydration Using Molecular Sieves
Ethanol dehydration via molecular sieves meets stringent purity requirements for industrial and food-grade applications. Type 3A molecular sieves are the optimal adsorbent for ethanol drying due to their precise pore size (3 Å), which selectively adsorbs water molecules while excluding ethanol.
In the dehydration process, hydrous ethanol vapor is fed through a fixed molecular sieve adsorption bed. As vapor passes through the bed, water molecules are preferentially adsorbed into the microporous structure of the activated sieve in the primary adsorption stage. Adsorption proceeds continuously until the water content in the vapor stream is reduced to the target specification or the molecular sieve reaches adsorption saturation.
Water mass transfer from hydrous ethanol vapor to the activated molecular sieve occurs within a defined mass transfer zone, where water concentration decreases progressively from the bed inlet to the outlet. This modular system employs a dual-bed configuration: one bed operates in adsorption/dehydration mode, while the second undergoes thermal regeneration to desorb adsorbed water and restore adsorption capacity. Bed switching between adsorption and regeneration is precisely controlled via automated valve systems and process instrumentation.
The anhydrous ethanol product purified by molecular sieve dehydration meets fuel-grade specifications and is suitable for automotive fuel applications and other high-purity industrial uses.
Dalian Chuangge Technology Co., Ltd
Richard Han
Doris Zhou
Headquater: 9th Floor, Century Classic Building, No.10, Xinghai Square, Shahekou District, Dalian City, Liaoning Province
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