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- Contact Person : Ms. Yin Ping
- Company Name : Beihai Kaite Chemical Packing Co., Ltd.
- Tel : 86-779-3202670
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Molecular Sieve
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Molecular sieves are crystalline metal aluminosilicates having a threedimensionalinterconnecting network of silica and alumina tetrahedra. Natural water of hydrationis removed from this network by heating to produce uniform cavities whichselectively adsorb molecules of a specific size.A 4 to 8-mesh sieve is normally used in gasphase applications, while the 8 to 12-meshtype is common in liquidphase applications. The powder forms of the 3A, 4A,5A and10X, 13X sieves are suitable for specialized applications.Long known for their drying capacity (even to 90°C), molecular sieves have recentlydemonstrated utility in synthetic organic procedures, frequently allowingisolation of desired products from condensation reactions that are governed bygenerally unfavorable equilibria. These synthetic zeolites have been shown to removewater, alcohols (including methanol and ethanol), and HCl from such systemsas ketimine and enamine syntheses, ester condensations, and the conversion of unsaturatedaldehydes to polyenals. Specifications: 1) 3A (0.6 K2O: 0.40 Na2O: 1 Al2O3: 2.0±0.1SiO2: x H2O)Major applications: commercial dehydration of unsaturated hydrocarbon streams, includingcracked gas, propylene, butadiene, acetylene; drying polar liquids suchas methanol and ethanol; adsorption of molecules such as NH3 and H2Ofrom a N2/H2 flow; considered as a general-purposedrying agent in polar and nonpolar media 2) 4A (1 Na2O: 1 Al2O3: 2.0±0.1 SiO2:x H2O)Major applications: preferred for static dehydration in closed liquid or gas systems,such as in packaging of drugs, electric components and perishable chemicals;water scavenging in printing and plastics systems and drying saturated hydrocarbonstreams; adsorbed species include SO2, CO2, H2S,C2H4, C2H6, and C3H6;generally considered as a universal drying agent in polar and nonpolarmedia 3) 5A (0.80 CaO: 0.20 Na2O: 1 Al2O3: 2.0±0.1SiO2: x H2O)Major applications: separation of normal paraffins frombranched-chain and cyclichydrocarbons; removal of H2S, CO2 and mercaptans from naturalgas; molecules adsorbed include nC4H10, nC4H9OH,C3H8 to C22H46, anddichlorodifluoro-methane (Freon 12®) 4) 13X (1 Na2O: 1 Al2O3: 2.8±0.2 SiO2:xH2O)Major applications: commercial gas drying, air plantfeed purification (simultaneousH2O and CO2 removal) and liquid hydrocarbon/natural gassweetening (H2S and mercaptan removal)
Molecular Sieve
