Gas Phase Molecular Sieve Dehydration
Pressure Swing Adsorption
The Gas Phase molecular sieve dehydration unit design passes a wet alcohol (or solvent) stream in vapor state at a controlled pressure through a column filled with molecular sieve beads. As the vapors pass through the bed of molecular sieve beads, the beads draw the water into their internals by polar attraction, while leaving the remaining vapors dehydrated as they exit the column.
At a defined cycle time, the gas flow is diverted to a second mole sieve column to allow the process vapors to be continuously dehydrated, while the first mole sieve column is regenerated using pressure swing adsorption.
Reducing the pressure and/or by pulling a vacuum on the column, attains regeneration, while using a purge gas helps to strip the water out of the molecular sieve beads. Commonly used purge gasses are N2 or process solvent which has already been dehydrated by the column. Some designs use up to 30% of the process flow as a purge gas. However, Wintek is able to accomplish this using only 5-10%.
Wintek’s Patented Gas Phase MSDUs are high efficiency designs that:
- Provide 90-95% solvent recovery rates
- Consume less energy than competing technologies
- Require minimal operator intervention
- Handles a wide variation in feed concentrations (0-10% by mass)
- Provide high purity:
- Standard Dryness: 99.5% (5,000 ppm water)
- Extra Dry: 99.9% (1,000 ppm water)
- Ultra-Dry: 99.95% (500 ppm water)
- Process from ½ gpm to over 25 gpm of wet alcohols/solvents
- Deliver as packaged units, fully piped and also wired