3A Molecular Sieve for Specific Applications, Various Mesh Sizes and Packaging Options

Product Description

Molecular Sieves

Zeolite molecular sieves are crystalline aluminosilicate materials with uniform micropores, functioning as molecular sieves via size exclusion, as catalysts via internal acidic sites, and as tunable media via ion exchange — combining separation, catalysis, and ion exchange in one framework.

Product Description

4A Molecular Sieves: Key Principles

4A molecular sieve is sodium type A alkali metal aluminosilicate. It appears as white spherical or strip-shaped pellets, with a fixed effective pore size of 0.4 nm (4 Angstrom) and a silica-alumina ratio of 2.
Structure & Function
Synthetic aluminosilicates (zeolites) with uniform micropores arranged in a cubic lattice.
Selective adsorption based on molecular size: Smaller molecules enter pores and are trapped, while larger ones are excluded—hence the "sieve" analogy.
Pore Size Classification
Type 3A (3 A), 4A (4 A), 5A (5 A), and 13X (10 A) are common, each targeting specific molecules (e.g., 3A for water, 4A for CO2).
Mechanism
Adsorption occurs via van der Waals forces and electrostatic interactions within pores.
Regenerable by heating (~200–350°C) to release trapped molecules.
Applications
Gas/Liquid Drying: E.g., dehydrating ethanol or natural gas.
Separation: Isomer purification (e.g., separating n-paraffins from branched chains).
Catalysis: Used as supports in petrochemical reactions.

Core Adsorption Characteristics

 Physical and Chemical Stability

Unique Ion Exchange Property

-Strong polar adsorption with priority to water absorption
Its pore channel has strong internal electric polarity. It exhibits far higher selective adsorption capacity for water molecules than other gases, realizing deep drying and reducing the gas dew point below -60℃. It is the most commonly used desiccant for deep dehydration.
-Large adsorption capacity
Under normal temperature and 75% humidity condition, its static water absorption rate can reach more than 22%. It absorbs water rapidly with stable saturated adsorption capacity.

-Excellent thermal stability: It can withstand calcination at up to 700℃. Its structure will not be damaged easily during high-temperature activation and regeneration, and can be recycled hundreds of times.
- Stable chemical property: Insoluble in water and most organic solvents; resistant to weak acid and weak alkali, and performs excellently in neutral environments; non-corrosive to equipment.
- High mechanical strength: The formed pellets feature high compressive strength. They are not easy to break and produce little dust during filling and fluidization, leading to low bed resistance.

It has sodium ion exchange capacity, which can replace calcium and magnesium ions in water. Therefore, it can be used as a softening auxiliary agent for phosphorus-free detergent, and adsorb heavy metal ions such as lead, copper and zinc. It can be regenerated with salt water after saturation.

Specification

Name	Unit	4A Molecular Sieve
shape	-	strip type		ball
diameter	mm	1.7-2.5	3.0-5.0	1.6	3.2
size ratio up to grade	%	≥98	≥98	≥96	≥96
bulk density	g/ml	≥0.72	≥0.70	≥0.66	≥0.66
wear ratio	%	≤0.20	≤0.20	≤0.20	≤0.20
crushing strength	N	≥35/p	≥85/p	≥35/p	≥70/p
static H2O adsorption	%	≥22	≥22	≥22	≥22
water content	%	≤1.0	≤1.0	≤1.0	≤1.0

Applications

1. Polarity & Adsorption Mechanism
Polar Cavity: The aluminosilicate framework creates an electrostatic field within pores due to unsatisfied charges (from Al³+ substitution in SiO4 tetrahedra).
Interactions:Polar Molecules (e.g., H2O, CO2, H2S): Bind via hydrogen bonding or dipole-cation attraction (e.g., H2O → K+ in 3A sieves).
Polarizable Molecules (e.g., CO2): Induced dipoles form transient bonds with lattice cations (e.g., Na+ in 13X sieves).
Selectivity: Smaller polar molecules (kinetic diameter ≤ pore size) are preferentially adsorbed over nonpolar ones (e.g., CH4).
2. Role in Desulfurization
Target Molecules:H2S (2.6 Å): Strongly adsorbed due to polarity and small size (fits even in 3A sieves).
COS (3.2 Å): Captured by larger-pore sieves (e.g., 4A or 5A).
Competitive Adsorption:H2O vs. H2S: Water typically dominates adsorption sites, requiring pre-drying of gas streams to optimize H2S removal.
CO2 Interference: CO2 (3.3 Å) competes with sulfur species in 4A/13X sieves; selective formulations (e.g., metal-doped sieves) mitigate this.

Company Profile

Pingxiang Rongjian Environmental Protection Chemical Packing Co., Ltd.

Innovative Solutions for Environmental & Industrial Applications
Headquarters: Xiangdong District Industrial Park, Pingxiang City, Jiangxi Province, China
 
Core Capabilities
 Advanced Manufacturing: Custom-designed towers and systems in ceramic, metal, and plastic materials.
Comprehensive Product Portfolio: 200+ specifications including:
• Ceramic/metal/plastic packing materials
• Molecular sieves & activated alumina
• Catalysts & petrochemical additives
• Activated carbon & eco-friendly filtration media
Turnkey Services: Full-scale pollution control and wastewater treatment projects.
Corporate Strengths
  ISO 9001 Certified - Guaranteed quality management system compliance.
 300+ Workforce - Including 100+ specialized engineers and technicians.
30-Acre Production Base - Integrated R&D and manufacturing facilities.
 
Awards & Innovations
 National Science & Technology Achievement Award
Provincial Gold Medal & Famous Brand Product
17 Patented Technologies - Protecting proprietary advancements.

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