Determination of Organic Vapor Respirator Cartridge Variability in Terms of Degree of Activation of the Carbon and Cartridge Packing Density

Trout, D.; Breysse, P.N.; Hall, Thad E.; Corn, Morton; Risby, T.

doi:10.1202/0002-8894(1986)047<0491:doovrc>2.3.co;2

Cited by 2 publications

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“…The packing fraction of granular filters is difficult to measure; but that of a simple cubic array of spheres (by no means the most closely packed structure possible) is 0.52, whereas that of fibrous filters is typically only a few percent. Trout, Breysse, Hall, Corn, and Risby (1986) found packing fractions of commercially available granular carbon filters of the same model to vary by a factor of about 1.3. It is most important that packing be tight, otherwise settling of granules and channelling of air through the loosely packed parts of the filter may occur.…”

Section: P R E Ssu R E D R O P Of C a R B O N Filtersmentioning

confidence: 96%

Review: Activated Carbon Filters in Respiratory Protective Equipment

Brown

1995

International Journal of Occupational Safety and Ergonomics

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The review considers first the nature of airflow through granular carbon filters and the relationship between pressure drop and airflow rate. Equilibrium adsorption is then summarized, with particular emphasis on the volume filling of micropores, on which most of the theory of activated carbon performance is based. The dynamics of adsorption is studied, and the analytical solution of the fundamental dynamic adsorption equation is given, leading to the development of various equations used in practice for the description of breakthrough. The most fundamental dynamic parameter, the rate constant for adsorption, is discussed, and the effects of concentration, granule diameter, and air stream velocity are summarized. Extracts of a number of experimental observations with reference to specific adsorbates are given, followed by an account of the adsorption of mixtures of compounds. The effect of relative humidity is discussed. This is followed by an account of non-destructive tests, and the review ends with a summary and an indication of possible fruitful areas for research.

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Section: P R E Ssu R E D R O P Of C a R B O N Filtersmentioning

confidence: 96%

Review: Activated Carbon Filters in Respiratory Protective Equipment

Brown

1995

International Journal of Occupational Safety and Ergonomics

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“…A relatively small value of K is a reasonable indication of a high percentage of narrow micropores in the carbon. 30 Thus, the carbon PCB has a larger micropore volume.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption of methylene chloride vapor on activated carbons

Tsai

Chang

1994

J of Chemical Tech & Biotech

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A laboratory investigation on the adsorption of hazardous methylene chloride (METH) vapor on the commercial activated carbons BPL and PCB, which were made from bituminous coal and coconut shell, respectively, was conducted at 283, 293, 303, and 313K. The physical properties and surface functional groups of the two activated carbons were also measured and compared with each other. The experimental results indicate that the adsorption capacity of carbon PCB is slightly higher than that of carbon BPL. It was found that the Langmuir, Freundlich, and Dubinin-Radushkevich adsorption equations were well fitted by the measured adsorption data. The values of the parameters of the adsorption equations were determined for the two adsorbents. The physical properties (e.g. micropore volume) of the adsorbents are consistent with the parameters obtained from the adsorption results. A C k K M n nr P 4. pe PO 4 q m R T W WO P J i NOTATION Adsorption potential (J mol-') Adsorbate concentration (mol m-3) Adsorbate liquid density (g cm-3)

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Determination of Organic Vapor Respirator Cartridge Variability in Terms of Degree of Activation of the Carbon and Cartridge Packing Density

Cited by 2 publications

References 0 publications

Review: Activated Carbon Filters in Respiratory Protective Equipment

Review: Activated Carbon Filters in Respiratory Protective Equipment

Adsorption of methylene chloride vapor on activated carbons

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