General description
Molecular sieves are crystalline metal aluminosilicates having a 3-dimensional interconnecting network of silica and alumina tetrahedra. Natural water of hydration is removed from this network by heating to produce uniform cavities which selectively adsorb molecules of a specific size. The 3A form is made by substituting potassium cations for the inherent sodium ions of the 4A structure, reducing the effective pore size to ~3Ã…, excluding diameter >3Ã…, e.g., ethane. The 4 to 8-mesh type is normally used in gas-phase applications. Molecular sieves are considered a universal drying agent in polar and nonpolar media.
Application
Molecular sieves have been used for the drying of dimethyl sulfoxide.
They may also be used in the following:
- Synthesis of ecteinascidin 743 (a potential marine-derived antitumor agent).
- Preparation of vanillyl nonanoate (a model capsinoid compound).
- Highly enantioselective Friedel-Crafts alkylation of indoles with nitroalkenes.
Molecular sieves, 3 Ã… may be used in the following processes:
- As a general-purpose drying agent in polar and nonpolar media.
- Commercial dehydration of unsaturated hydrocarbon streams, including cracked gas, propylene, butadiene, acetylene
- Drying polar liquids such as methanol and ethanol.
- Adsorption of molecules such as NH3 and H2O from a N2/H2 flow.
- UPC:
- 41105000
- Condition:
- New
- Weight:
- 1.00 Ounces
- HazmatClass:
- No
- WeightUOM:
- LB
- MPN:
- 208574-5KG
