Baslton Vapor Adsorption Cartridges
Vapor Adsorption Cartridges
Type CI Vapor Adsorption Cartridges contain a bed of adsorbent granules in the annular space between two Microfibre Filter Tubes, with permanently bonded end caps. Utilizing a wide choice of adsorbents, the Type CI cartridges selectively remove vapors from air and other gases. Flow direction is inside-to-outside through the cartridge, and the outer Microfibre Filter cartridge serves as an integral final filter to prevent carryover of adsorbent particles.
For low flow applications, Disposable Adsorption Units (DAU) provide a means of utilizing the same choice of adsorbents used in the Type CI cartridges in a completely disposable package.
Because the absorbed vapor remains trapped in the solid bed, the Type CI cartridge has a fixed upper limit of total weight of vapor which can be captured. It is usually not feasible to regenerate the cartridge when it has reached its adsorption limit. Type CI cartridges should be used only when small quantities of vapor are to be removed.
|Adsorbents used in Type CI Cartridges |
|Adsorbent ||Grade No. ||Use For|
Compressor oil vapors, C5 and heavier hydrocarbons, aromatics,oxygenated hydrocarbons, chlorinated organics, freons, carbon disulfide.
Most C4 and lighter hydrocarbons, etylene, propylene, acetylene, ethylene Type 13X oxide, ammonia, mercaptans, sulfur hexafluoride, triethylamine, and smaller amines.
Mixed Sodium and Hydroxides
All acidic gasses, including sulfur trioxide, sulfur dioxide, nitrogen dioxide, Calcium carbon dioxide, hydrogen sulfide, hydrogen chloride, phosphorus trichloride, boron triflouride.
Considerations in Using Adsorbent Cartridges
The following factors should be considered when selecting a vapor adsorbent cartridge:
1. Solid adsorbents are effective only for vapors. Since liquids will damage or inactivate most solid adsorbents, the Type CI cartridge or DAU must be preceded by an efficient coalescing filter.
2. In contrast with Microfibre Filters, which operate at their initial efficiency throughout their life, adsorbent cartridges have a limited holding capacity. When the adsorption capacity is reached, no further adsorption occurs. The limiting capacity, or “breakthrough” point, is not sharply defined, and the exit vapor concentration will increase rapidly as saturation is approached. To avoid unwanted vapor contaminants downstream, it is necessary to change the adsorbent cartridge well before it has reached its ultimate adsorption capacity.
3 .Adsorption is reversible, if operating conditions change, a vapor may desorb rather than adsorb. For example, if a temporary surge in vapor impurity concentration causes a relatively high concentration to be absorbed on the solid, a subsequent decrease in inlet vapor composition will result in desorption of vapor from the solid to the gas stream.
4. The efficiency of a given adsorbent for a given vapor depends upon the specific operating conditions. Therefore, again in contrast to filtration, it is not possible to assign a single efficiency rating to an adsorbent. While it is not possible to predict or guarantee an adsorption efficiency for any specific set of conditions, it is possible to enhance the conditions beneficial to adsorption and avoid conditions which interfere with adsorption. Conditions which aid adsorption are: low temperature, high pressure, low flow rate, and absence of competing vapors (particularly water vapor).