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Molecular Sieve 4A – Deep-Drying Adsorbent for Gas & Liquid Streams

Molecular Sieve

Molecular Sieve 4A is suitable for the drying of gases (e. g: natural gas, petrol gas) and liquids, with an aperture of about 4 angstroms.

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Product Description

Precision Sodium-Form Universal Adsorbent

Molecular Sieve 4A (Type A Sodium Form - NaA)

Name: Molecular Sieve 4A – Deep-Drying Adsorbent for Gas & Liquid Streams
SKU: 0

Engineered with a uniform 4-angstrom pore opening based on the sodium-form aluminosilicate crystal structure. It adsorbs molecules with critical diameters smaller than 4Å—such as water, carbon dioxide, sulfur dioxide, hydrogen sulfide, carbon monoxide, and ethylene—making it the foundational universal desiccant and purification medium for industrial gases and liquids.

Effective Pore Size

~ 4 Angstroms (4A)

Crush Strength

≥ 60 – 130 N/particle

H₂O Equilibrium Capacity

≥ 22.0 wt%

Attrition & Dusting Loss

≤ 0.10 wt% (High Durability)

Sodium Crystal Lattice & Broad-Spectrum Adsorption Mechanics

Type 4A molecular sieve features sodium ions ($Na^+$) positioned within its Type A crystal framework, opening up an effective pore aperture of approximately 4 angstroms.

Because of this versatile pore geometry, it captures high polar and small-molecule contaminants with exceptional affinity. While it admits molecules like moisture, $CO_2$, and $H_2S$, it successfully excludes larger cyclic compounds and branched-chain hydrocarbons, offering robust thermal stability and high water-adsorption capacity even at elevated temperatures.

Detailed Technical Specifications

Physical & Chemical Parameter	Standard Specification	Customization Options
Crystal Framework Type	Sodium-A Form (NaA Zeolite)	Optimized silica-alumina ratios
Standard Pellet Sizes	1.5–3.0 mm / 3.0–5.0 mm Spherical or Cylindrical	Custom mesh cuts and extrudate diameters
Equilibrium Water Capacity	≥ 22.0% (at 25°C, relative humidity = 50%)	Enhanced kinetic adsorption grades
Single Particle Crush Strength	≥ 60 N (1.5–3.0mm) / ≥ 130 N (3.0–5.0mm)	Heavy-duty high-pressure structural versions
Packed Bulk Density	0.70 – 0.78 g/cm³	Tailored for specialized tower vessel volumes
Attrition / Abrasion Loss	≤ 0.10 wt% max	Ultra-low dust tumbling ratings
Package Moisture (As Shipped)	≤ 1.5 wt%	Hermetically sealed steel drum packaging

Comprehensive Application Sectors

General Gas & Air Dehydration

Deep drying of compressed air, natural gas, refinery gases, inert gases (nitrogen, argon), and industrial gas streams down to sub-ppm moisture dew points.

Carbon Dioxide ($CO_2) & Acid Gas Removal

Simultaneous removal of trace moisture, carbon dioxide, and hydrogen sulfide from hydrocarbon gases to prevent pipeline corrosion and catalyst poisoning in downstream units.

Static Packaging & Pharmaceutical Desiccant

Utilized in static moisture-adsorption packets, electronic components packaging, and pharmaceutical containers to preserve shelf-life and prevent humidity degradation.

Refrigerant & Insulating Glass Drying

Employed in closed-loop refrigeration loops and insulated window glass (IG) spacer units to scavenge moisture and prevent internal window frosting.

Paint, Coating & Polyurethane Additive

Incorporated as an active powder binder in polyurethane paints, adhesives, and sealants to trap moisture and prevent carbon dioxide bubbling during curing.