3A Molecular Sieve
3A molecular sieves should be used to dry dehydration solvents for electron microscopy. Most common solvents (acetone, ethanol, and methanol, etc.) need to be anhydrous for electron microscopy embedding work using epoxy resins, yet they have a tendency to pick up atmospheric water when bottles are opened. Molecular sieves are used to dehydrate the solvents used in the final stages of dehydration and embedding . Molecular sieves are typically zeolite compounds that strongly adsorb water and have carefully controlled pore sizes. While both the solvent and the water will adsorb strongly to the molecular sieve surfaces, the large surface area within the pores is only accessible to the smaller water molecules, so they are effectively removed from the solvent. From the table below it can be seen that water (1.93A) will enter that 3A pore size while acetone (3.08A) will largely be excluded. Water will be able to occupy the large surface area inside the pores and thus be removed. If the solvent could also enter the pores, it would compete with water for the surface area and there would be little or no removal of the water from the bulk solvent. Type 4A molecular sieve is not suitable for drying ethanol, methanol, or acetone since the pore size does not exclude these solvents. The Advanced Specialty Gas Equipment catalog lists Type 3A for drying ethanol and methanol.

Formual:0.4K2O·0.6Na2O·Al2O3·2.OSiO2·4.5H2O

Technical parameter:

Item unit target 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  ≥96  ≥96 Bulk density  g/ml  ≥0.60  ≥0.60  ≥0.64  ≥0.64 Wear ratio  %  ≤0.20  ≤0.25  ≤0.20  ≤0.20 Crushing strength  N  ≥45/cm  ≥60/cm  ≥45/p  ≥60/p Static adsorption  %  ≥20  ≥20  ≥20  ≥20 Packing water  %  ≤1.5  ≤1.5  ≤1.5  ≤1.5

*This is the typical parameter of this kind ,different applications require different parameter, please contact detail.         Reactivation method :                 Insufflate the sieve bed with vapor to exchange the organics out to avoid char formation at first ,then reactivate the molecular sieve with common method .For further detail ,please abide our latest instruction.         Typical applications:                 ●Dehydration of many kinds of liquids (say ethanol).                 ●Dehydration of air .                 ●Dehydration of refrigerant.                 ●Dehydration of natural gas or methane.                 ●Dehydration of cracked gas ,ethylene ,propylene or butadiene.         Packing:                 25kg carbon box ;55Gallon iron drum.         Attention:                 To avoid damp and pre-adsorption of organic before running ,or must to be reactivated.