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Development of a two-way breathing respirator with polymeric absorption.

Authors
Brown-CE; Kalumuck-KM; Prabhukumar-S; Chahine-GL
Source
Dynaflow, Inc., Fulton, Maryland 1996 Mar; :1-59
Link
NIOSHTIC No.
00235023
Abstract
Efforts were made to predict the toxic gas removal capabilities of a respirator system which used alternating flow through a bed of absorbent polymeric materials. The polymer bed was composed of fine parallel channels. To identify parameters having significant impact on the absorptive capacity of the system, mass and heat transfer computations were performed. Partition coefficients and diffusivities of the toxic gas polymer pair for mass transfer were found to be of primary importance as were the diameter, length and spacing of the channels. Significant affects on performance were also noted for air flow velocity in the channels. Simulated breathing experiments with measured concentrations of gases were performed at typical breathing frequencies and showed that the oscillating flow system reached an equilibrium state for which no further increases in exiting concentration occurred. Partition coefficients varied from one polymer to another by orders of magnitude, and the polymers tested showed significant sensitivity to temperature. The temperature distribution in the oscillating flow respirator channel rapidly approached near linear variation from the entrance to exit with the exiting temperature being essentially body temperature and out breath temperature at the entrance being that of the ambient atmosphere. Oscillatory flow polymer respirators were shown to be competitive for gases at high percentages of saturation when compared to activated charcoal respirators. When used along with supplemental air, the respirators could greatly extend the life of the air supply.
Keywords
NIOSH-Grant; Respirators; Toxic-gases; Personal-protective-equipment; Respiratory-system-disorders; Breathing; Safety-equipment
Contact
Dynaflow Inc 7210 Pindell School RD Fulton, MD 20759
Publication Date
19960301
Document Type
Final Grant Report
Funding Amount
333748
Funding Type
Grant
Fiscal Year
1996
NTIS Accession No.
PB97-147136
NTIS Price
A05
Identifying No.
Grant-Number-R44-OH-03011
NIOSH Division
OEP
Source Name
Dynaflow, Inc., Fulton, Maryland
State
MD
Performing Organization
Dynaflow, Inc., Fulton, Maryland
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