The production of high-purity ethanol (≥99.9%) is critical for industries such as pharmaceuticals, electronics, and new energy. 3A molecular sieve dehydration technology is a preferred industrial solution for large-scale anhydrous ethanol production due to its green, efficient, and low-energy-consumption advantages.
Common 3A molecular sieves (pore size ~3Å) can adsorb water (diameter ~2.6Å) but exclude ethanol molecules (diameter ~4.4Å), enabling efficient dehydration. High-quality 3A molecular sieves can adsorb 20–22% water (by weight), and can be regenerated by heating to 170–250°C, with a cycle life of over 5,000 uses.
Typical PSA (Pressure Swing Adsorption) Process for Ethanol Dehydration Using Molecular Sieves:
1. Pre-treatment: Crude ethanol (~95%) undergoes condensation and impurity removal before entering the molecular sieve adsorption column.
2. Adsorption Phase: Ethanol vapor passes through the 3A molecular sieve bed; water is adsorbed, and dry ethanol (≤100 ppm H₂O) is output.
3. Regeneration Phase: The system switches to a standby adsorption tower; the saturated tower is heated (170–250°C) and purged with nitrogen to remove moisture.
4. Cooling and Reuse: The regenerated molecular sieves are cooled to working temperature and reused in the next cycle.
JOOZEO’s 3A molecular sieves feature high adsorption capacity, excellent selectivity, outstanding mechanical strength, and chemical stability. They enable ethanol purity up to 99.9%, making them an ideal solution for efficient, stable, and environmentally friendly ethanol dehydration and purification.
Post time: Jul-11-2025