ESTIMATION OF THE RESIDUAL ADSORPTION CAPACITY OF CHARCOAL FILTERS

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Authors
  1. Wheat, J.A.
  2. Hyde, J.C.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
A method has been developed for estimating the residual adsorption capacity of charcoal filters. Since the method is non-destructive and uses a low concentration of a non-toxic gas, it can be applied to installed collective protectors. It can also be used as a non-destructive, laboratory test method for protective mask canisters or other small charcoal filters. In laboratory experiments, beds of charcoal were challenged with Freon-113 and the time required for the exit concentration to reach 0.005% of the inlet concentration was determined. It was demonstrated that break time was related to the amount of material adsorbed on the charcoal and also to the length of time in service. Break time also depended upon flow rate, inlet concentration, temperature, relative humidity and bed depth. Equations were developed to relate the break time of beds of fresh charcoal with these five variables. To estimate the residual capacity of a filter, its measured break time would be compared with th
Report Number
663 —
Date of publication
15 Sep 1972
Number of Pages
39
DSTKIM No
72-06430
CANDIS No
16512
Format(s):
Hardcopy;Originator's fiche received by DSIS;Document Image stored on Optical Disk

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