molekulaarsõel

nimisõna

Erialasõnastikud

ID 715560 Viimati muudetud 29.04.2014

Valdkond analüütiline keemia

molekulaarsõel

molecular sieve

tamis moléculaire

molekyyliseula

a microporous structure composed of either crystalline aluminosilicates, chemically similar to clays and feldspars and belonging to a class of materials known as zeolites, or crystalline aluminophosphates derived from mixtures containing an organic amine or quaternary ammonium salt (whose) pore sizes range from 5 to 10 Å (and whose characteristic is its) ability to undergo dehydration with little or no change in crystalline structure
porous crystalline substances, especially aluminosilicates (see zeolite), that can be dehydrated with little change in crystal structure. As they form regularly spaced cavities, they provide a high surface area for the adsorption of smaller molecules.

molekulaarsõel

molecular sieve

Näited

Filter the solution through a glass fibre filter paper (4.5) and collect the whole filtrate in a 150 ml conical flask. Add 7,5 g molecular sieve (3.4), stopper and shake for five minutes.

Hea teada

[The molecular sieves] are used in many fields of technology: to dry gases and liquids, for selective molecular separations based on size and polar properties, as ion-exchangers, as catalysts, as chemical carriers, in gas chromatography, and in the petroleum industry to remove normal paraffins from distillates.

tamis moléculaire

molekyyliseula

ID 1125895 Viimati muudetud 02.12.2024

Valdkond metroloogiamõõduvahendid

molekulaarsõel

molecular sive

sõel, mida kasutatakse gaaside ja vedelike kuivatamiseks ning molekulide mõõtmiseks ja eraldamiseks nende mõõtmete ja kuju alusel

sieve that is use for drying gases and liquids and for separating molecules on the basis of their sizes and shapes

molekulaarsõel

Näited

Kui kaks molekuli on võrdsete mõõtmetega ja võivad pooridesse siseneda, siis põhineb molekulaarsõela abil nende eraldamine molekuli polaarsusel (laengu eraldamisel), kuna eelistatavalt adsorbeerub polaarsem molekul.

molecular sive

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