molecular sieve


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mo·lec·u·lar sieve

a gellike material with pore sizes of such ranges as to exclude molecules above certain sizes; used in fractionating or purifying macromolecules.

molecular sieve

1 a crystalline chemical separation device with molecular size pores that adsorbs small but not large molecules.
2 a cross-linked polymer that forms a porous sieve used as a supporting medium for chromatographic separation of mixtures of solutes.

molecular sieve

A material (e.g., oxides: silicate, aluminate, zeolite crystals with pores) which is capable of separating molecules based on size.

molecular sieve

A type of sieve in which the molecular material present in the gel or crystal will adsorb molecules of a certain kind and let others pass.
See also: sieve
References in periodicals archive ?
Molecular sieves have an equilibrium capacity of up to 20% by weight water.
By 1954, largely through the championship of Bob Milton, Linde had announced it was entering the business of manufacturing and selling molecular sieve zeolites as a new class of industrial adsorbents, and in 1959 as hydrocarbon conversion catalysts--a remarkable example of discovery to commercialization of a new business venture in just five years.
To improve on nature's molecular sieves, many researchers are developing synthetic varieties whose properties they can tailor (SN: 6/23/01, p.
Indeed, a molecular sieve enclosed in a polymer cage with void space between the two phases appears to be the picture (shown in a schematic representation in Fig.
A previous recipient of The Design Council's Millenium Award, the company's range of Maxigas nitrogen gas generators uses a carbon molecular sieve to separate the oxygen from compressed air to provide high purity nitrogen alone.
A fractionation step and molecular sieve are used to get the solvent and monomer feed dry enough for the polymerization reaction.
The VFD minimizes the air flow to a point that water is desorbed from the molecular sieve but only minimal heat leaves the wheel during the regeneration process.
Dust-free silica gel, activated carbon, molecular sieve or a combination can be used as desiccant.
Among the issues to be discussed in the conference, mention can be made of: nanotechnology-based zeolites (nanozeolites), morphology and structure changes, environmental applications and requirements, catalyst, adsorption and molecular sieve and ion exchange.
Italian dryer manufacturer New Omap has added a wheel dryer to its range--with the molecular sieve permanently bonded into a rotor with a honeycomb type matrix.

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