Recirculation Filter Unit for the M28 Simplified Collective Protection Systems: Adsorption Equilibria of Candidate Nonwoven Microporous Media

摘要

Adsorption equilibria of nitrogen, hexane, and DMMP are provided on two nonwoven adsorbent materials recommended for use in the recirculation filter unit (RFU) for the M28 Collective Protection System. The objective of this report is to correlate adsorption equilibria of the three adsorbates and to provide a model to predict the adsorption capacity of the media for toxic chemical agents over an extended range of vapor concentrations. This information may be used to select the best adsorbent materials for the RFU as well as to establish production acceptance criteria consistent with field use requirements. Adsorption equilibria of nitrogen, hexane, and DMMP on POLYSORB (PS) and Purification Products (PP) adsorbent materials show that there is much less adsorption capacity per unit packing volume than typical granular bed activated carbons such as BPL. A Dubinin-Radustikevich (DR) potential plot of the combined nitrogen, hexane, and DMMP data shows that the total estimated micropore volume of the PS and PP adsorbent materials is 0.113 and 0.077 mL/g of material, respectively. On a volume basis, the PP material may provide about 2.8 times more adsorptive capacity than the PS material. The estimated adsorbed phase loading of HE mustard at 0.029 mg/m(3) at 25 degrees C is about 0.035 and 0.015 mL/g of material for the PS and PP materials, respectively.