How do you use molecular sieve 3A?
Place the container of hot, regenerated sieves on the porcelain plate of a glass desicator and place under vacuum while they cool. Put dry sieves into bottles with polyethelene cap liners to keep dry until needed. Type 3A molecular sieves will reduce water in an air stream to 0.001 mg/liter air.
How do you regenerate molecular sieve 3A?
Regeneration. Methods for regeneration of molecular sieves include pressure change (as in oxygen concentrators), heating and purging with a carrier gas (as when used in ethanol dehydration), or heating under high vacuum. Regeneration temperatures range from 175 °C to 315 °C depending on molecular sieve type.
How much water can 3A molecular sieves absorb?
The 3A refers to the size of the molecule it can absorb. In this case, less than 3 angstrom. Molecular sieve 3A has an absorption capacity of 22% by weight. To dry a liquid, add a slight excess of drying agent.
How do you dry 3A molecular sieves?
Air dry the molecular sieve from empty solvent bottles in a fume hood draft until they appear dry before heating at elevated temperatures. While the sieves bind much water, they also hold some solvent and you don’t want to heat the pellets very hot with a lot of solvent present.
How do you activate molecular sieves 3A?
Before a scientist can use molecular sieves as a drying agent, she must “activate” them by removing all traces of water and other volatile compounds. Normally, this involves heating the sieves to 300 to 320 degrees Celsius (572 to 608 degrees Fahrenheit) for about 15 hours.
What is molecular sieve 3A?
mSORB 3A molecular sieve is a multiple purpose, highly porous, high capacity alkali metal alumino-silicate in the spherical form. It is the potassium form of the Type A crystal structure with pore diameters of approximately 3Å.
What is Zeolite formula?
Zeolites are microporous, three dimensional crystalline solid of aluminium silicate. The chemical formula of zeolites is Na2Al2Si2O8. xH2O. Zeolites have small openings of fixed size in them which allow small molecules to pass through them easily but larger molecules cannot pass through them.
Can you reuse molecular sieves?
Molecular sieves may be reused by allowing them to air- dry in a fume hood for a few days to remove all the surface acetone. Once acetone was no longer detected (smelled), the molecular sieves were transferred to an oven-safe container (metal or Pyrex) (fig. 7) and placed into a 250°C oven for 24 hours.
How much molecular sieves should I use?
Q：How can it be used? A：The drying capacity of molecular sieves is theoretically about 20 ~ 25% of its own weight. Add molecular sieves of about 3 to 4 times of the calculated amount of the organic solvent, and leave it for about 24 hours with occasional stirring.
What is the chemical formula for 3A molecular sieve?
3A Molecular Sieve. mSORB® molecular sieve beads are the potassium form of the Type A crystal structure with a pore opening of approximately 3 Angstroms in diameter. The beads exhibit high mass transfer efficiency, high crush strength and durability. Chemical Formula: K 12 [(AlO 2) 12(SiO 2) 12] · nH 2O.
How big is a zeolite 3A molecular sieve?
3A Molecular Sieve Molecular sieve 3A, also called zeolite 3A or zeolith 3A, is one type of aluminosilicate crystal with average pores measuring of 3 angstrom (0.3 nm). Molecular with kinetic diameter larger than 3 angstrom will be adsorbed by zeolite 3A, otherwise be excluded.
How big is a super sack molecular sieve?
Drums: 150 kg / 330 lb. Super Sacks: Fill weight to order specification. Molecular sieve is also know as a zeolite. A zeolite is a conformation of hydrated aluminosilicates of sodium, potassium, calcium, or other cations.
How is the diameter of a molecular sieve measured?
Some molecular sieves are used in chromatography, a separation technique that sorts molecules based on their size. Other molecular sieves are used as desiccants (some examples include activated charcoal and silica gel ). The diameter of a molecular sieve is measured in ångströms (Å) or nanometres (nm).