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Lab Reagents

Adsorbents, Ion Exchangers & Molecular Sieves

Alumina, silica, ion-exchange resins, activated carbon and molecular sieves for chromatography, drying, purification and catalyst support work.
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Adsorbents and exchangers do the quiet work of purification. This sub-category supplies chromatographic alumina, silica gel, molecular sieves, activated carbon and ion-exchange resins in a range of particle sizes and activities. Alumina alone appears in several forms, including Aluminium oxide G (neutral for TLC), Aluminium oxide (α-phase) 99.9%, and Aluminium oxide granules 1-3 mm at 99.99% for catalyst supports and high-temperature use.

Selection rests on the separation task. Column chromatography needs a defined mesh and Brockmann activity. Drying solvents calls for molecular sieves with the right pore size, such as 3A for alcohols and 4A for most aprotic solvents. Ion-exchange work depends on resin type, capacity and the ionic form supplied.

Products are packed in moisture-proof containers because activity drops as they adsorb water from the air. Larger bags and drums are available for process users. Each lot ships with a COA, and our chemical grades guide explains the terms used on labels.

Adsorbents, Ion Exchangers & Molecular Sieves: questions buyers ask

Which molecular sieve pore size should I use to dry a solvent?
Choose a pore size that admits water but excludes the solvent. 3A sieves suit methanol, ethanol and acetonitrile because these molecules are too large to enter. 4A sieves work for most aprotic solvents such as THF, toluene and dichloromethane. Activate sieves by heating under vacuum before use for the lowest water levels.
What is the difference between acidic, neutral and basic alumina?
The surface pH of alumina affects which compounds it retains or degrades. Neutral alumina is the general choice for sensitive compounds. Basic alumina is good for amines and for removing acidic impurities. Acidic alumina helps separate acids and some neutral compounds. Activity grade, set by water content, also controls retention.
How can I regenerate an ion-exchange resin?
Cation resins are regenerated with a dilute strong acid to return them to the hydrogen form, or with brine for the sodium form. Anion resins use sodium hydroxide. Rinse with deionised water until the effluent is neutral. Capacity drops slowly over many cycles, so record performance and replace the resin when it falls off.

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