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4A Molecular Sieve
 

Molecular Sieve type 4A is an alkali alumino silicate; it is the sodium form of the Type A crystal structure. 4A molecular sieve has an effective pore opening of about 4 angstroms (0.4nm).  Type 4A molecular sieve will adsorb most molecules with a kinetic diameter of less than 4 angstroms and exclude those larger. Such adsorbable molecules include simple gas molecules such as oxygen, nitrogen, carbon dioxyde and straight chain hydrocarbons. Branched chain hydrocarbons and aromatics are excluded.

Technical Parameter

Item

Unit

Technical data

Shape

 

Pellet

Sphere

Diameter

mm

1.5-1.7

3.0-3.3

1.7-2.5

3.0-5.0

Size ratio up to grade

%

≥98

≥98

≥98

≥98

Bulk density

g/ml

≥0.66

≥0.66

≥0.70

≥0.70

Wear ratio

%

≤0.20

≤0.40

≤0.20

≤0.20

Crushing strength

N

≥30/cm

≥45/cm

≥30/p

≥70/p

Static water adsorption

%

≥21

≥21

≥21

≥21

Static methanol adsorption

%

≥15

≥15

≥15

≥15

Water content, as shipped

%

≤1.5

≤1.5

≤1.5

≤1.5

 

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