What is molecular sieve dehydration?

Molecular sieve dehydration employs an adsorption process using synthetic zeolite, a crystalline, highly porous material. The process is based on the principle that zeolite’s affinity for water changes at different pressures.

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.

How much water can 3A molecular sieves absorb?

22%
Molecular sieve 3A has an absorption capacity of 22% by weight. To dry a liquid, add a slight excess of drying agent.

How much water can molecular sieves absorb?

Molecular sieve beads typically absorb up to ~40% of their weight in water, but become less efficient after about 20% absorption. So you need between 100 and 190 pounds of 3 Å molecular sieve beads per 100 gallons of EtOH.

What is natural gas dehydration?

Gas dehydration is the process of removing water vapor from a gas stream to lower the temperature at which water will condense from the stream; this temperature is called the “dew point” of the gas.

How do you regenerate 3A molecular sieves?

To regenerate the sieve you need to remove the adsorbed moisture and other materials. To regenerate 3A Molecular Sieve heat to 250ƒ. Keep 3A Molecular Sieve in an air tight container until ready for use to avoid unintended moisture adsorption.

How do I choose a molecular sieve?

Selecting molecular sieves Molecular sieves are available in different shape and sizes. But the spherical beads have advantage over other shapes as they offer lower pressure drop, are attrition resistant as they do not have any sharp edges, and have good strength, i.e. crush force required per unit area is higher.

How do you dry 3A molecular sieves?

Heat the drying agent at 250C for about 2 hours in a shallow layer (not over a few cm deep) with a cover that lets water escape (but retains much heat). Use tongs to transfer the cup with hot sieves to an glass dessicator with a porcelain support to allow cooling without much atmospheric water uptake.

What is the difference between 3A and 4A molecular sieves?

3A is the preferred Molecular Sieves adsorbent for the commercial dehydration of unsaturated hydrocarbon streams. 4A is the preferred Molecular Sieves adsorbent for the static dehydration in a closed gas or liquid drying system.

What is 5A molecular sieve?

Molecular sieve 5A, also called zeolite 5A or zeolith 5A, is one type of aluminosilicate crystal with average pores measuring of 5 angstrom (0.5 nm). Molecular with kinetic diameter smaller than 5 angstrom will be adsorbed by zeolite 5A, otherwise be excluded.

What are 3A molecular sieves used for?

BASF 3A Molecular Sieve is commonly used for drying of gases and polar liquids (methanol, ethanol) and easily polymerizable substances, such as unsaturated hydrocarbons (ethylene, propylene, acetylene and butadiene).

What is the function of the gas dehydration unit?

The purpose of a glycol dehydration unit is to remove water from natural gas and natural gas liquids. When produced from a reservoir, natural gas usually contains a large amount of water and is typically completely saturated or at the water dew point.