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| pertaining to an aromatic compound, which contains one or more benzene or equivalent heterocyclic rings: many such compounds have an agreeable odor |
| a compound of high molecular weight made by adding many smaller molecules or by condensation smaller molecules with the elimination of water or alcohol |
| molecular sieve | |
| —n | |
| chem a material that can absorb large amounts of certain compounds while not absorbing others and is thus suitable for use in separating mixtures | |
molecular sieve
a porous solid, usually a synthetic or a natural zeolite, that separates particles of molecular dimension. Zeolites are hydrated metal aluminosilicate compounds with well-defined crystalline structures. The silicate and aluminate groupings form three-dimensional crystal lattices surrounding cavities in which the metal ions and the water molecules are loosely held. Channels run through the entire crystal, interconnecting the cavities and terminating at the crystal surface. Upon heating, the zeolites lose their water content with little or no change in their crystal structure. The dehydrated zeolite can reversibly absorb water or other molecules that are small enough to pass through the channels or pores. The metal ions are also readily replaceable by other ionic units of similar charge and size
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