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Molecular Sieve Types: Comparing 3A, 4A, 5A, and 13X for Industrial Use
Jul 09, 2026
3A Molecular Sieve (Potassium Zeolite A)
The 3A type is created when potassium ions replace sodium ions in the standard crystal lattice. With a 3 Angstrom pore size, it excludes virtually all molecules except water.
- Why it matters: It is widely used in ethanol dehydration. Because it excludes ethanol molecules but captures water molecules, it can break the azeotropic point to yield high-purity fuel-grade ethanol.
4A Molecular Sieve (Sodium Zeolite A)
This is the base form of the Type A zeolite. It efficiently adsorbs water, carbon dioxide, and small quantities of hydrogen sulfide.
- Why it matters: It is the standard desiccant for closed-loop air systems, packaging, and air brakes in commercial vehicles.
5A Molecular Sieve (Calcium Zeolite A)
By replacing sodium ions with calcium ions, the pore size expands to 5 Angstroms.
- Why it matters: It is highly effective for Pressure Swing Adsorption systems used to purify hydrogen, as it allows pure hydrogen gas to pass through while capturing impurities like carbon monoxide and methane.
13X Molecular Sieve (Sodium Zeolite X)
Type 13X has a significantly larger pore structure (approximately 10 Angstroms) and a modified crystal frame.
- Why it matters: It features the highest theoretical capacity of the common molecular sieves and can remove hazardous trace impurities like mercaptans from natural gas streams.
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