The contrast between nitrogen generator membrane separation and carbon molecular sieve.

Comparison of nitrogen generator membrane separation and carbon molecular sieve Nitrogen generator as one of the commonly used equipments in the laboratory, as a nitrogen gas supply source, a wide range of uses.
, it plays an important role in the normal operation of mass spectrometography and gas chromatography.
, how do you choose the right nitrogen generator? Membrane separation technology and variable pressure adsorption technology are the two main nitrogen production technologies of nitrogen generators today.
two nitrogen-making technologies have their own characteristics and advantages.
membrane separation technology compressed air through the hollow fiber membrane, because different gas molecule diameter is different, when the air passes through the membrane, the molecular diameter of oxygen, carbon dioxide and water vapor will pass through the hollow fiber membrane pipe small holes, and then discharged into the atmosphere.
the membrane outlet, large molecule diameter nitrogen molecules and inert gas argon are collected and transported to the application equipment.
this nitrogen separation extraction technology is simple and effective, without any moving parts.
variable pressure adsorption technology variable pressure adsorption nitrogen filling material is carbon molecule sieve, is a porous loose rod carbon particles, when compressed air through the carbon molecule sieve, also according to the diameter of the gas molecule, carbon molecule sieve will absorb water vapor and oxygen, but nitrogen will not be adsorbed, and thus separated.
the process of absorbing variable pressure adsorption includes the adsorption decompression-re-birth phase.
the production of nitrogen by using variable pressure adsorption technology and membrane separation technology, each has its own advantages.
, one separation technique has an advantage over the other for certain application devices.
which technology is better and more appropriate depends on the application and flow rate requirements and cannot be generally discussed.
, it should be emphasized that neither nitrogen film nor carbon molecular sieve are consumables and do not need to be replaced regularly.
In contrast to the two technologies: 1. Small size and weight of nitrogen film size, light weight, compact structure, lighter and smaller, and even the generator can be placed under the standard test bench, these are the perfect choice for laboratories with limited space.
2. Noise membrane separation technology does not produce any noise, which means that the membrane separation nitrogen generator can be placed next to the application instrument, quietly working, without the need to place the generator in another room, thereby reducing the additional costs of pipe extension, but also avoid the risk of pipe leakage.
3. Purity nitrogen in different analytical instruments play a different role, so the need for purity is also different, nitrogen mainly as atomized gas and protective gas, purity 95% can fully meet the demand.
idealized state, the large purity that variable pressure adsorption can achieve is better than membrane separation technology.
But the nitrogen purity produced by variable pressure adsorption has a great relationship with the intake amount, pressure, gas source quality, if the air source is unclean or the air pressure is not enough, that purity will be greatly reduced, can not simply think that variable pressure adsorption purity must be high.
4. Dew point, water content determines the water content of nitrogen dew point, in addition to separation technology, intake quality and filtration system is also very important.
For variable-pressure adsorption of carbon molecular sieve, if the front end is not properly treated, not only the water removal capacity is reduced, but also will pollute the carbon molecule sieve, over time carbon molecular sieve will lose the ability to absorb.
for membrane separation, if there is a better front-end treatment and dewatering design, the same can be effective dewatering, reduce dew point.
5. The load film separation and variable pressure adsorption of air compressor have different demands on air volume.
for membrane separation, the higher the purity, the more air required, the greater the air compressor load.
For variable pressure adsorption, there will be a blow-back phenomenon, so the amount of gas used is much higher than the theoretical value, can not simply according to the ratio of empty nitrogen to get the actual amount of air, the corresponding air compressor load is also greater than the ideal situation.
6. Maintenance membrane separation technology moves fewer parts, so maintenance is simple.
Once the generator is in problem, the small and light nitrogen membrane takes up a small footprint, making the maintenance of the generator and the replacement of spare parts very convenient, while also reducing maintenance and repair costs, saving time.
the operation of additional nitrogen film does not require the management and control of many electronic components, so more electronic components can be used to monitor the core technical parameters, ensuring the stability of the generator.
pressure adsorption relative to moving parts, electronic controls are more, so maintenance and maintenance is more cumbersome.
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