4A Molecular Sieve Desiccant Dehydration Agent for Ethanol & Ethylene
Introduction of 4A Molecular Sieve Desiccant:
The characteristics and uses of 4a molecular sieve, 4a molecular sieve is a microporous cubic lattice of synthetic aluminum silicate. It is called a "molecular sieve" because it absorbs or repels molecules of different substances depending on the size of the pores in the crystal. Materials whose molecular diameter is smaller than the pore size of the molecular sieve can enter the molecular sieve and be adsorbed.
Ion exchange performance - water softening function: Each oxygen atom in the 4A molecular sieve framework is shared by two adjacent tetrahedra. This structure forms a large crystal cavity that can be occupied by cations and water molecules. These cations and water molecules have greater mobility, allowing for cation exchange and reversible dehydration. 4A molecular sieve conducts ion exchange with aluminum ions on the framework, and each aluminum ion has a negative charge, which can bind not only sodium ions, but also other cations. Calcium and magnesium ions can enter the large crystal pores occupied by the original sodium ions and replace the sodium ions in the 4A molecular sieve, that is, the sodium ions in the 4A molecular sieve can undergo ion exchange and can be combined with Ca2 and Mg2 ions in hard water. The exchange achieves the purpose of softening the water quality.
|SiO2/ Al2O3||≈ 2|
|Normal Pore Opening||4 Angstroms (Å)|
|Regeneration temp. (°C)||200-315|
|Advantages||High Stability; High Strength; Large Water Absorption; Low Attrition; Deep Dehydration|
Specification of 4A Molecular Sieve Desiccant:
|Items||Unit||8*12 Mesh||4*6 Mesh|
|Bulk Density||g/ml ≥||0.70-0.82||0.65-0.80|
|Equilibrium Water Capacity @ 25℃||wt% ≥||20.5-22.5||20.5-22.5|
|Equilibrium Methanol Capacity||wt% ≥||15.0||15.0|
|Heat of Adsorption||BTU/lb of H2O||1800||1800|
|Crush Strength||Point Contact||N ≥||30-80||85-160|
|Attrition Rate||wt% ≤||0.1||0.1|
|Size Qualification||% ≥||98||98|
|Package Moisture||wt% ≤||1.5||1.5|
|The interval value of the indexes above are based on the grade of Molecular Sieve 4A|
Display of 4A Molecular Sieve Desiccant:
Storage of 4A Molecular Sieve Desiccant:
The molecular sieve shall be stored at room temperature, in which the relative humidity does not exceed 90%, and be not exposed to air, and prevented from water, acids, and alkalizes.
The Attention of 4A Molecular Sieve Desiccant:
1. The product cannot be exposed to the open air and should be stored in dry condition with an air-proof package.
2. The product should be regenerated after a certain period of adsorption. The appropriate regenerated temperature would be better below 350°C.