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.
Farlex Partner Medical Dictionary © Farlex 2012

molecular sieve

A material (e.g., oxides: silicate, aluminate, zeolite crystals with pores) which is capable of separating molecules based on size.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Validation of analysers used for monitoring H2O at the outlet of molecular sieve dryer vessels is important because under normal operating conditions no H2O will be present for extended periods of time.
The chemical activity of two kinds of molecular sieve, AlPO4-5 molecular sieve and SBA-15 molecular sieve was tested in the specific reactor between 2-mercapto-[1, 3, 4] thiadiazde ( 1.32 g 10mmol ) and unsaturated acid oleic acid at 45 AdegC for 1 hour.
After doping with Ce, the acid density of the molecular sieve decreased.
The 4 A molecular sieves and formaldehyde were used as a removable solid template and weak reductant in the process, respectively The virtue of this method is that we can avoid the use of nonvolatile surfactants and polymers.
Among the SAPO molecular sieves, the SAPO-34 catalyst has high selectivity for light olefins production due to its shape selectivity during the methanol to light olefins (MTO) and DTO reactions; numerous studies have been conducted to improve the lifetime of this catalyst [9-22].
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.
Monomers must be purified and dried by molecular sieves.
Summary: The Zeolite Molecular Sieves Market is projected to have the highest growth during the forecast period.
Grace will increase the price of silica-based and molecular sieve products sold through its Grace Materials Technologies business segment by 7% as contracts allow.

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