Molecular Sieve

Carbon molecular sieve is a porous carbon adsorption material with a precise microporous structure. It achieves selective adsorption ( (3).JPG

Carbon molecular sieve is a porous carbon adsorption material with a precise microporous structure. It achieves selective adsorption ( (4).JPG

Carbon molecular sieve is a porous carbon adsorption material with a precise microporous structure. It achieves selective adsorption ( (5).JPG

Carbon Molecular Sieve CMS-240

Carbon molecular sieve is a porous carbon adsorption material with a precise microporous structure. It achieves selective adsorption of different molecules by regulating the micropore size. It is widely used in the field of gas separation (such as nitrogen preparation).

product details

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Carbon Molecular Sieve Adsorption Separation Principle

Kinetic Differences

For gases with molecular diameters close to the pore size (such as O₂ and N₂), carbon molecular sieves strongly adsorb molecules with faster diffusion rates (such as O₂). For example, the molecular diameter of O₂ is approximately 0.346 nm, and that of N₂ is approximately 0.364 nm. Within the pores of carbon molecular sieves, the diffusion rate of O₂ is much higher than that of N₂. Therefore, within a short period of time, O₂ is preferentially adsorbed, while N₂, due to its slower diffusion, is enriched.

Pressure Dependence

Adsorption capacity increases with increasing pressure and decreases with decreasing pressure. This property makes it well-suited for pressure swing adsorption (PSA) processes—a continuous separation process using pressure-dependent adsorption and pressure-dependent desorption.

Non-polar preference

Carbon molecular sieve is a non-polar material. Its adsorption capacity for non-polar or weakly polar gases (such as O₂, N₂, CO) is stronger than that for polar molecules (such as H₂O, CO₂). However, polar impurities (such as water, CO₂) in the raw gas must be removed first to avoid micropore clogging.

technical parameter

Model	Adsorption pressure(Mpa)	Nitrogen purity(%)	Nitrogen yield(NM³/MT.H)	Air-To-Nitrogen Ratio
CMS-220	0.75-0.8	99	260	2.4
		99.5	220	3.1
		99.9	145	3.7
		99.99	100	4.8
		99.999	55	6.8
CMS-240	0.75-0.8	97	360	2.1
		98	320	2.2
		99	280	2.3
		99.5	240	3.0
		99.9	160	3.5
		99.99	110	4.6
		99.999	65	6.6
CMS-260	0.75-0.8	97	390	2.0
		98	350	2.1
		99	320	2.2
		99.5	260	2.9
		99.9	175	3.4
		99.99	120	4.6
		99.999	75	6.5
CMS-280	0.75-0.8	97	410	2.0
		98	365	2.1
		99	335	2.2
		99.5	280	2.8
		99.9	190	3.4
		99.99	135	4.5
		99.999	90	6.4
CMS-300	0.75-0.8	99	380	2.2
		99.5	300	2.7
		99.9	230	3.1
		99.99	140	4.6
		99.999	95	5.8
CMS-330	0.75-0.8	99	420	2.1
		99.5	330	2.6
		99.9	255	3.0
		99.99	160	4.6
		99.999	100	5.8
Particle diameter	0.9-1.1mm or custom-made	bulk density	630-680G/L	Test temperature ≤20 degrees Celsius
adsorption time	2 x 40-50 seconds (adjustable)	Compressive strength	≥50N/piece	Test temperature ≤20 degrees Celsius

The core application of carbon molecular

sieves is gas separation and purification, particularly in pressure swing adsorption (PSA) processes:

1. Nitrogen Generation (the core application)

● Principle: When air (containing O₂, N₂, Ar, etc.) enters the PSA tower, the carbon molecular sieve, under pressure, preferentially adsorbs O₂, which has a faster diffusion rate (due to its smaller molecular diameter). N₂, due to its slower diffusion, is able to pass through the adsorption bed and be output as product gas. During pressure reduction, the adsorbed O₂ is desorbed, and the molecular sieve is regenerated.

● Advantages: Compared to cryogenic air separation, PSA nitrogen generation offers lower investment, lower energy consumption, and flexible start-up and shutdown. It can produce nitrogen with a purity of 95–99.999%, meeting the needs of the chemical, food, and electronics industries.

● Applications: Chemical pipeline purging, preservation of foodstuffs, electronic packaging, and metal heat treatment..

Carbon molecular sieve is a porous carbon adsorption material with a precise microporous structure

2. Other Gas Separation

● Hydrogen Purification: Adsorbs impurities such as CO and CH₄ from syngas (containing H₂, CO, and CH₄) to purify H₂(H₂molecules have a diameter of 0.289 nm and diffuse rapidly, making them difficult to adsorb into micropores).

● Inert Gas Separation: For example, separating Ar from air (requires special pore size design as Ar and N₂molecules have similar diameters).

3. Environmental Protection and Industrial Auxiliary

● VOC Recovery: Adsorbs volatile organic compounds (such as benzene and toluene) from industrial waste gases, enabling resource recovery or achieving emission standards.

● Gas Drying Pretreatment: Serves as an auxiliary adsorbent to remove trace moisture from gases (requires use with a dehydrating agent to prevent water from clogging micropores).