Molecular Sieve - Grade 3A - Bead Size 1.00 to 1.50 mm diameter

Description

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Molecular Sieve 3A
Premium quality -
Bead size 1.0 to 1.5 mm Diameter
A molecular sieve is a material with pores (very small holes) of uniform size. These pore diameters are similar in size to small molecules, and thus large molecules cannot enter or be adsorbed, while smaller molecules can. As a mixture of molecules migrate through the stationary bed of porous, semi-solid substance referred to as a sieve (or matrix), the components of highest molecular weight (which are unable to pass into the molecular pores) leave the bed first, followed by successively smaller molecules. 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). According to IUPAC notation, microporous materials have pore diameters of less than 2 nm (20 Å) and macroporous materials have pore diameters of greater than 50 nm (500 Å); the mesoporous category thus lies in the middle with pore diameters between 2 and 50 nm (20–500 Å).
Applications
Molecular sieves are often utilized in the petroleum industry, especially for drying gas streams. For example, in the liquid natural gas (LNG) industry, the water content of the gas needs to be reduced to less than 1 ppmv to prevent blockages caused by ice.
In the laboratory, molecular sieves are used to dry solvent. "Sieves" have proven to be superior to traditional drying techniques, which often employ aggressive desiccants.
Under the term zeolites, molecular sieves are used for a wide range of catalytic applications. They catalyze isomerisation, alkylation, and epoxidation, and are used in large scale industrial processes, including hydrocracking and fluid catalytic cracking.
They are also used in the filtration of air supplies for breathing apparatus, for example those used by scuba divers and firefighters. In such applications, air is supplied by an air compressor and is passed through a cartridge filter which, depending on the application, is filled with molecular sieve and/or activated carbon, finally being used to charge breathing air tanks.[9] Such filtration can remove particulates and compressor exhaust products from the breathing air supply.
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.[12] In contrast, silica gel can be regenerated by heating it in a regular oven to 120 °C (250 °F) for two hours. However, some types of silica gel will "pop" when exposed to enough water. This is caused by breakage of the silica spheres when contacting the water.
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Molecular Sieve
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COUNTRY
DELIVERY TIME
Working Days
5 - 10
11 - 15
16 - 20
21- 25
26 - 29
>30
>40
>50
European Union
Rate (Item Arrived)
70%
62.1%
29.6%
10.5%
4.7%
REFUND
REFUND
REFUND
United Kingdom
Rate (Item Arrived)
68.5%
63.1%
29.1%
11.0%
4.4%
REFUND
REFUND
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United States
Rate (Item Arrived)
12.4%
21.0%
44.3%
60.2%
37.1%
10.0%
3.0%
REFUND
Israel
Rate (Item Arrived)
10.5%
28.7%
43.8%
10.1%
7.0%
2.0%
REFUND
REFUND
Australia
Rate (Item Arrived)
11.1%
22.0%
30.2%
50.9%
65.0%
16.0%
5.0%
REFUND
Philippines
Rate (Item Arrived)
0.6%
10.1%
22.5%
72.6%
57.9%
14.0%
6.0%
REFUND
Japan
Rate (Item Arrived)
3.5%
25%
28.0%
12.9%
9.1%
4.8%
REFUND
REFUND
Canada
Rate (Item Arrived)
2.2%
7.3%
11.0%
17,2%
25.7%
50.6%
21.0%
REFUND
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