4A Molecular Sieve

Introduction

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 specification

Model 4A
Color Light gray
Nominal pore diameter 4 angstroms
Shape Sphere Pellet
Diameter (mm) 1.7-2.5 3.0-5.0 1.6 3.2
Size ratio up to grade (%) ≥98 ≥98 ≥96 ≥96
Bulk density (g/ml) ≥0.72 ≥0.70 ≥0.66 ≥0.66
Wear ratio (%) ≤0.20 ≤0.20 ≤0.20 ≤0.20
Crushing strength (N) ≥35/piece ≥85/piece ≥35/piece ≥70/piece
Static H2O adsorption (%) ≥22 ≥22 ≥22 ≥22
Static methanol adsorption(%) ≥15 ≥15 ≥15 ≥15
Water content (%) ≤1.0 ≤1.0 ≤1.0 ≤1.0
Typical Chemical Formula Na2O . Al2O3 . 2SiO2 . 4.5 H2O
SiO2 : Al2O3≈2
Typical Application a) Drying and removing of CO2 from natural gas, LPG, air, inert and atmospheric gases, etc.
b) Removal of hydrocarbons, ammonia and methanol from gas streams (ammonia syn gas treating)
c) Special types are used in the air break units of buses, trucks and locomotives.
d) Packed in small bags, it may be used simply as a packaging desiccant.

Regeneration

Molecular sieve Type 4A can be regenerated by either heating in the case of thermal swing processes; or by lowering the pressure in the case of pressure swing processes.
To remove moisture from a 4A molecular sieve, a temperature of 250-280°C is required. A properly regenerated molecular sieve can give moisture dew points below -100°C.
The outlet concentrations on a pressure swing process will depend on the gas present, and on the conditions of the process.

Size

4A – Zeolites are available in beads of 1-2 mm(10×18 mesh), 2-3 mm(8×12 mesh), 2.5-5 mm(4×8 mesh) and as powder, and in pellet 1.6mm, 3.2mm.

Comments

To avoid damp and pre-adsorption of organic before running, or must to be reactivated.

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