3A Molecular Sieve For Adsorbing Trace Moisture in Ethyl Acetate
3A molecular sieve is mainly used in dryers and air separation devices for petroleum cracking gas, refinery gas, oilfield gas and olefins. Such as the drying of ethylene, acetylene, propylene, butadiene, and the dehydration of alcohol and various solvents, as well as natural gas.
3A molecular sieve has a strong drying effect to obtain high-concentration isopropanol without affectting on the state of isopropanol (gaseous, liquid). Nearly a hundred experiments have confirmed that the molecular sieve has good regeneration performance, long service time, and simple operation.
3A molecular sieve can be combined with ordinary distillation tower to achieve the dehydration of isopropanol vapor and reduce consumption.
Technical Parameter:
| Model | 3A | |
| CAS Number | 308080-99-1 | |
| Nominal pore diameter | 3 angstroms | |
| Shape | Sphere | Pellet |
| Diameter (mm) | 3.0-5.0(4*8 mesh) | 3.2(1/8 inch) |
| Size ratio up to grade (%) | ≥98 | ≥96 |
| Bulk density (g/ml) | ≥0.70 | ≥0.68 |
| Wear ratio (%) | ≤0.20 | ≤0.40 |
| Crushing strength (N) | ≥85/piece | ≥50/piece |
| Static H2O adsorption (%) | ≥21 | ≥21 |
| Ethylene adsorption (‰) | ≤3.0 | ≤3.0 |
| Water content (%) | ≤1.5 | ≤1.5 |
| Typical Chemical Formula |
0.4K2O . 0.6Na2O . Al2O3 . 2SiO2 . 4.5 H2O (SiO2 : Al2O3 ≈2) |
|
Regeneration of molecular sieves
The adsorption of water molecules by molecular sieves is an exothermic process, which means that heat is released during the adsorption process. This process is reversible, and the adsorbed water molecules can be desorbed by heating, so that the molecular sieve can be regenerated and its adsorption capacity can be restored.
There are two basic methods for regeneration of molecular sieves:
1) Change the temperature. It removes adsorbed substances by heating molecular sieves. In industry, preheated regeneration gas is generally used to heat, purge the molecular sieve to 200-350°C, and take away the desorbed adsorbates.
2) Change the relative pressure. After the adsorbent reaches saturation with the adsorbed water, the pressure is quickly reduced to atmospheric pressure. At this time, the adsorbed water will desorb by itself and the adsorbent can be regenerated. This method requires no additional heat input.
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