Zibo XiangRun Environment Engineering Co., Ltd.News
Molecular sieve supplier
Molecular sieve adsorbents are crystalline alumino-silicates, known as zeolite. Their unique structure allows the water of crystallization to be removed, leaving a porous crystalline structure. These pores or "cages" have a high affinity to re-adsorb water or other polar molecules. Aided by strong ionic forces (electrostatic fields) due to the presence of cations such as sodium, calcium and potassium and by the absolutely enormous internal surface area of close to 1'000 m2/g, molecular sieves will adsorb a considerable amount of water or other fluids. If the fluid to be adsorbed is a polar compound, it can be adsorbed with high loading, even at very low concentrations of the fluid. Molecular sieves will therefore remove many gas or liquid impurities to very low levels (ppm or less).
Another feature of molecular sieve adsorbents is their ability to separate gases or liquids by molecular size or polarity. The pore or "cage" openings are of the same size as many molecules. e.g. in the case of hydrocarbon paraffins, the normal, straight chained molecules can fit into the pores and be adsorbed, while the branched chain molecules cannot enter the pores and pass through the molecular sieve bed un-adsorbed.
There are molecular sieve 3a, molecular sieve 4a, molecular sieve 5a, molecular sieve 13x, ASU molecular sieve, PSA molecular sieve, XH molecular sieve in Zibo Xiangrun Environment Engineering Co.,Ltd.
| Model | Pore diameter (Ångström) | Bulk density (g/ml) | Adsorbed water (% w/w) | Attrition or abrasion, W (% w/w) | Usage |
|---|---|---|---|---|---|
| 3Å | 3 | 0.60–0.68 | 19–20 | 0.3–0.6 | Desiccation of petroleum cracking gas and alkenes, selective adsorption of H2O in insulated glass (IG) and polyurethane |
| 4Å | 4 | 0.60–0.65 | 20–21 | 0.3–0.6 | Adsorption of water in sodium aluminosilicate which is FDA approved (see below) used as molecular sieve in medical containers to keep contents dry and as food additive having E-number E-554 (anti-caking agent); Preferred for static dehydration in closed liquid or gas systems, e.g., in packaging of drugs, electric components and perishable chemicals; water scavenging in printing and plastics systems and drying saturated hydrocarbon streams. Adsorbed species include SO2, CO2, H2S, C2H4, C2H6, and C3H6. Generally considered a universal drying agent in polar and nonpolar media;[11] separation of natural gas and alkenes, adsorption of water in non-nitrogen sensitive polyurethane |
| 5Å-DW | 5 | 0.45–0.50 | 21–22 | 0.3–0.6 | Degreasing and pour point depression of aviation kerosene and diesel, and alkenes separation |
| 5Å small oxygen-enriched | 5 | 0.4–0.8 | ≥23 | Specially designed for medical or healthy oxygen generator[citation needed] | |
| 5Å | 5 | 0.60–0.65 | 20–21 | 0.3–0.5 | Desiccation and purification of air; dehydration and desulphurization of natural gas and liquid petroleum gas; oxygen and hydrogen production by pressure swing adsorption process |
| 10X | 8 | 0.50–0.60 | 23–24 | 0.3–0.6 | High-efficient sorption, be used in desiccation, decarburization, desulphurization of gas and liquids and separation of aromatic hydrocarbon |
| 13X | 10 | 0.55–0.65 | 23–24 | 0.3–0.5 | Desiccation, desulphurization and purification of petroleum gas and natural gas |
| 13X-AS | 10 | 0.55–0.65 | 23–24 | 0.3–0.5 | Decarburization and desiccation in the air separation industry, separation of nitrogen from oxygen in oxygen concentrators |
| Cu-13X | 10 | 0.50–0.60 | 23–24 | 0.3–0.5 | Sweetening (removal of thiols) of aviation fuel and corresponding liquid hydrocarbons |
