00000nam 2200000zi 4500 9.941858 CaOODSP 20241017155152 m o d f cr bn||||||||| 240814e197209##oncd ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn--- DR52-17/6-1972E-PDF Wheat, James A., author. Estimation of the residual adsorption capacity of charcoal filters / by J.A. Wheat and J.C. Hyde. Ottawa : Defence Research Establishment Ottawa, September 1972. 1 online resource (v, 33 pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier DREO report ; 663 Digitized edition from print [produced by Defence Research and Development Canada]. "Project No. D-82-30-12." Includes bibliographical references (page 33). "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 the break time calculated for a bed of fresh charcoal. A graphical method of carrying out the calculation is given"--Abstract, page iii. Includes abstracts in English and French. Charcoal Absorption and adsorption Experiments. Filters and filtration Experiments. Charbon de bois Absorption et adsorption Expériences. Filtres Expériences. Defence Research Establishment Ottawa, issuing body. Canada. Defence Research Board, issuing body. DREO report ; no. 663. (CaOODSP)9.941661 PDF 1.18 MB https://publications.gc.ca/collections/collection_2024/rddc-drdc/DR52-17-6-1972-eng.pdf 72-375