Chemical Additives

Molecular Sieve

We are a manufacturer based in China, specializing in high-quality Molecular Sieve for industrial clients worldwide. Technical support and custom formulation available.

Category：Chemical Additives | Brand：MT

Factory Direct 7-30 Days Lead Time MOQ: 100KG Global Export

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Introduction

Properties and Applications

1. Definition & Structure

Molecular sieves are porous materials with uniform pore sizes, typically composed of aluminosilicates (e.g., zeolites).
They selectively adsorb small molecules while excluding larger ones based on size exclusion.

2. Key Characteristics

Property	Description
Pore Size Uniformity	Precise pore diameters (e.g., 3Å, 4Å, 5Å, 10Å) for selective adsorption.
High Surface Area	Provides extensive adsorption capacity.
Thermal Stability	Stable at high temperatures (up to 600–700°C).
Hydrophilicity	Strong affinity for water (used as desiccants).

3. Applications

Separation & Purification
- Gas/Liquid Separation:
  - Removal of H₂O (drying), CO₂, H₂S, and other impurities from natural gas, air, and solvents.
  - Separation of isomers (e.g., p-xylene from o– and m-xylene).
- Oxygen Concentrators: Nitrogen removal from air (e.g., LiX zeolite).
Catalysis
- Catalyst Support: Enhances dispersion of active metals (e.g., Pt, Pd).
- Acidic/Basic Catalysis: Zeolites (e.g., ZSM-5, Y-type) for cracking, alkylation, and isomerization.
Industrial Uses
- Drying Agents: Packed in desiccant columns for solvents and refrigerants.
- Petrochemicals: FCC (Fluid Catalytic Cracking) catalysts in oil refining.

4. Common Types

Type	Pore Size (Å)	Key Applications
3A	3	Drying polar liquids (ethanol, methanol).
4A	4	Air drying, CO₂ removal.
5A	5	N₂/O₂ separation, petroleum refining.
13X	10	CO₂ removal, gas purification.

5. Regeneration & Reusability

Thermal Regeneration: Heating at 250–350°C under vacuum or inert gas to remove adsorbed molecules.
Pressure Swing Adsorption (PSA): Cyclic adsorption-desorption for continuous processes.