| Shape: | Pellet |
|---|---|
| Drying Method: | Static Drying |
| Kind: | Adsorbent |
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Title: High-Performance Molecular Sieves for Advanced Adsorption and Separation
Introduction:
Molecular sieves are highly versatile, synthetic aluminosilicate materials known for their exceptional ability to separate molecules based on size and polarity. They feature a microporous structure with uniform pores of precise diameters, functioning like microscopic filters. Their high surface area and strong affinity for water and various gases make them indispensable in industries requiring extremely dry environments or pure gas streams.
Key Characteristics:
Selective Adsorption: Their uniform pore size allows them to selectively adsorb molecules smaller than the pore diameter while excluding larger ones. This is fundamental to their separation capabilities.
High Adsorption Capacity: Even at very low relative pressures and high temperatures, molecular sieves maintain a significantly higher adsorption capacity for water and other polar molecules compared to other desiccants like silica gel or activated alumina.
Regenerability: A key economic and environmental advantage is that molecular sieves can be fully regenerated and reused multiple times through heating (thermal swing adsorption) or pressure reduction (pressure swing adsorption) without significant degradation in performance.
Inertness & Stability: They are chemically inert, non-toxic, and possess high mechanical strength and thermal stability, making them suitable for demanding industrial processes.
Common Types & Primary Applications:
Type 3A: Used for drying cracked gas (e.g., ethylene), ethanol dehydration, and drying polar liquids.
Type 4A: A general-purpose desiccant for drying gases, liquids, and refrigerants. It is also used in static dehydration in closed systems (e.g., insulated glass windows).
Type 5A: Ideal for separating normal paraffins from branched-chain and cyclic hydrocarbons in the petroleum industry. Also used for purifying air (CO2 and moisture removal) and in PSA oxygen generators.
Type 13X: Has the largest pore opening. Used for general gas drying, hydrogen sulfide and carbon dioxide (CO2) removal from gas, and air separation prepurification (removing H2O and CO2).
Carbon Molecular Sieves (CMS): Used primarily in Pressure Swing Adsorption (PSA) systems for nitrogen generation from air, based on the differential diffusion rates of oxygen and nitrogen.
Typical Physical and Chemical Properties:
| Parameter / Type | 3A | 4A | 5A | 13X | Unit |
|---|---|---|---|---|---|
| Nominal Pore Size | 3 Å | 4 Å | 5 Å | 10 Å | Angstroms (Å) |
| Bulk Density | 0.64-0.70 | 0.64-0.70 | 0.64-0.70 | 0.57-0.63 | g/ml |
| Crush Strength | > 40 | > 40 | > 40 | > 30 | N/bead |
| Static H2O Adsorption | ≥ 20.5 | ≥ 22.0 | ≥ 21.5 | ≥ 25.0 | wt% |
| CO2 Adsorption | - | - | ≥ 17.0 | ≥ 17.0 | wt% |
| Loss on Ignition (LOI) | ≤ 1.5 | ≤ 1.5 | ≤ 1.5 | ≤ 1.5 | wt% |
| Form | Beads / Pellets | Beads / Pellets | Beads / Pellets | Beads / Pellets | - |
| Pellet Size (Common) | 1.6-2.5 mm | 1.6-2.5 mm | 1.6-2.5 mm | 1.6-2.5 mm | mm |
| Bead Size (Common) | 2.0-2.8 mm | 2.0-2.8 mm | 2.0-2.8 mm | 2.0-2.8 mm | mm |
| pH Value | 10.0 - 11.0 | 10.0 - 11.0 | 10.0 - 11.0 | 10.0 - 11.0 | - |
| Regeneration Temp. | 150 - 300 | 150 - 300 | 150 - 300 | 150 - 300 | °C |
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