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Directions in using CMS
Thank you for choosing the products made by our company!
China Carbon Molecular Sieve Co, Ltd has been at the leading edge of Carbon
Molecular Sieve Frontier in China since its establishment and CMS products have
been exported to a number of countries and regions in Asia, America and Europe.
The techniques for production of high quality CMS developed in our company have
been awarded a number of prizes for contributions in science and technology by
the National and the Provincial as well as the local administrations.
China Carbon Molecular Sieve Co, Ltd. will provide you and the new as well as
old clients in nitrogen-making with our first-class brand and service.
The carbon molecular sieve (CMS)is a kind of? nonpolarity? sorbent. It has the
performance to absorb oxygen in the air under changing pressure of normal
temperature and acquire rich nitrogen gas through Pressure Swing Adsorption
A. The Major Models of CMS
CMS-180 CMS-190 CMS-200 CMS-210 CMS-220
B. The Principle of producing nitrogen by CMS
A carbon molecular sieve belongs to the kind of carbon sorbent and it is the
carbon skeletal flamework, which is a disordered accumulation of carbon. The
capability of air separating is based on its skeletal framework. In dynamics,
CMS has different adsorptive rate for oxygen and nitrogen. Under balanced
condition , the adsorption by CMS towards O2 and N2 is very close, however, the
speed O2 molecule passing through the framework is faster than N2 molecule, this
principle is the bases of CMS N2 generation. Before the adsorption, oxygen and
other impurities are adsorbed by the CMS, allowing unabsorbed nitrogen to pass
through the bed.
C. Nitrogen generator by CMS
This apparatus is often called Air Separation Nitrogen Plants. The process uses
the principle of Pressure Swing Adsorption(PSA).Pressure-swing adsorption
nitrogen-making is realized through the features that CMS has, of selective
adsorption and the difference adsorption capacity under different pressure.
Oxygen molecular are withheld by carbon molecular sieve because its spreading
speed is much quicker than nitrogen molecular in the carbon molecular sieve'
minute hole structure when the pressure is raising, while the adsorption to
nitrogen molecular are relieved by the oxygen gas. It makes carbon molecular
sieve regenerate, forms circulatory operation, and realizes nitrogen-making
The PSA process includes; Pressure adding, Nitrogen producing, Pressure
balancing; Pressure reducing, Nitrogen releasing; then repeat these procedures
again,...and the circulation process was formed by these procedures .According
to the style of regeneration, the process can be concluded into regelaeration in
vacuum process (VPSA)and regeneration in normal pressure process.
According to the demands of clients, the nitrogen generation plant based on the
PSA-process can consist into; the air pressing and purifying system, pressure
swing and adsorption system, programmable valve controller system(the VPSA
process even in need of the vacuum pump),and Nitrogen supply system.
D. The principle in controlling nitrogen generation by CMS
1.Air compressing and purifying process.
It is very necessary to let purified air into the adsorption tower, because if
mote and organic gas entered the adsorptiorn tower, they will jam the skeletal
framework, later it will lower the effects of generating.
The means to purify air; a. To keep the inlet of air compressing machine far
away from dust, oil frog as well as organic gas; b. The raw material air, which
pumped into the CMS adsorption tower, should first get through filter and
cooler, also the purifying system filled with sorbent, later it will undergo a
2.The N2 purity and production capacity.
When generation nitrogen by CMS, the N2 concentration and production capacity
can be adjusted according to the needs of users. In a certain time and under a
certain pressure, when reducing the production, the purity would rise;
Otherwise, it would fall. User can adjust according to their practical needs.
3.The time period for pressure balancing.
In the process of generation, when one tower ends its adsorption, the compressed
air can be immitted both from top and bottom into the other adsorption towers
which had been regenerated, and then the two towers reach the same pressure,
this process is called the pressure balancing between the two adsorption towers.
If choosing a proper time for pressure balancing, it cannot only reclaim the
energy, but also reducing the impingement CMS received, as a result, the purpose
of prolonging the longevity of CMS is reached. With the reference to the speed
of valve switching, the time for pressure balancing should be 1 to 3s.
4.N2 producing time period.
According to the fact that CMS have different rate in adsorption of N2 and O2.as
it can saturate in a short time when adsorbing O2,while at the same time the
amount of N2 adsorbed is small. The relatively short time period of nitrogen
generation can also adds the frequency of valve switching, SO the performance of
the valve is also very important. The normal time period of adsorption is 30 to
120s.Small-sized high purity N2 generator is recommended to have short period of
generation time, while large-sized low purity generation long.
CMS has both the effect of dynamics and the effects of adsorption by
depressurization. The capacity of adsorption raises when the pressure put on to
the CMS is high, so adsorption by adding pressure is favorable, but the pressure
adding demands higher model of air compressor.
Concerning adsorption pressure, the requirements in the process of normal
pressure regeneration and vacuum generation is different. After considering an
these conditions, the adsorption pressure under normal pressure is suggested to
choose 5 to 8kg/cm2, vacuum 3 to 5kg/cm2.
As a sorbent, the relatively lower tempemture is good for the exertion of CMS.
If possible, it is favorable for the nitrogen generator to lower the temperature
E. The package and usage of the product.
1.The products undergo strict check and measure in line with the standards of
our company, so as to insure the quality of the product.
2.The products are airproofed in plastic barrels; the performance of hermetic
package is reliable, open when padding into the generation towers, proof from
3.The padding should be tight, please make them tight and firm with proper
method, don't pug it with a stick directly.