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Application of Wheeler–Jonas equation and relative breakthrough time (RBT) in activated carbon beds of respirator gas filters

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Abstract

In the use of activated carbon beds as adsorbents for various types of organic vapors in respirator gas filters, the estimation methods of breakthrough curves and breakthrough time and their applicable range of weight of the beds have been of significant concern. In this study, we prepared several types of activated carbon beds having weights of 35, 80, and 258 g that were preconditioned by equilibration with moisture at different relative humidities (RH = 40 – 70%) and a constant temperature of 293 K. Then, we measured breakthrough curves of several types of organic vapors of the beds at these RHs and temperature and investigated estimation using a theoretical formula, Wheeler–Jonas equation, and relative breakthrough time (RBT) using cyclohexane as a standard. The Wheeler–Jonas equation showed good agreement with breakthrough curves in this study, and the measured RBTs showed good agreement with the reference data by Tanaka et al., with a small number of exceptions. As a result, we confirmed that the Wheeler–Jonas equation and RBT are effectively applicable to organic vapor breakthrough data of activated carbon beds having weight even in the region of > 35 g.

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Funding

This study was funded by National Institute of Occupational Safety and Health, Japan Organization of Occupational Health and Safety (Fundamental Research N–F31–02).

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Correspondence to Hironobu Abiko.

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The authors declare that they have no conflict of interest or competing interest in this study.

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ESM 3

Schematic overview of organic vapor breakthrough in activated carbon bed and the breakthrough curve. (DOCX 63.3 kb)

ESM 4

Dependence of the correlation coefficient of the fit of our breakthrough curves by the Wheeler–Jonas equation on activated carbon bed mass in the region RH < 50% at 293 K. (DOCX 21.1 kb)

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Abiko, H., Furuse, M. & Takano, T. Application of Wheeler–Jonas equation and relative breakthrough time (RBT) in activated carbon beds of respirator gas filters. Air Qual Atmos Health 13, 1057–1063 (2020). https://doi.org/10.1007/s11869-020-00857-z

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