A method was developed to measure purifier siloxane removal efficiencies from air under dry and humid conditions. This method measured hydrocarbons to 1 part-per-trillion (ppt) concentration levels with a Gas Chromatograph and Flame Ionization Detector (GC/FID). Several media types were examined: Activated Alumina (AA), Activated Carbon (AC), Bead-shaped Activated Carbon (BAC), a Proprietary Inorganic Material (PIM) and a Zeolite (ZEO). Under dry conditions, all five materials removed the siloxane challenge to below 1ppt. Under humid conditions the AC material had a removal efficiency of 286 ppt. The AA, BAC, PIM and ZEO removed the siloxane challenge to below 1 ppt under humid conditions. After media saturation was reached, the materials were regenerated and siloxane removal efficiencies were re-examined. Under humid conditions only the AA, PIM and ZEO materials were regenerable to below 1ppt efficiency levels.
A method was developed to measure hydrocarbons to 1 part-per-trillion (ppt) concentration levels with a gas chromatograph and flame ionization detector (GC/FID). This method was used to measure purifier siloxane removal efficiencies from air under dry and humid conditions. Several media types were examined: activated carbon (AC), bead-shaped activated carbon (BAC) and a proprietary inorganic material (PIM). Under dry conditions, all three materials removed the siloxane challenge to below 1ppt. The AC material had a removal efficiency of 286 ppt under humid conditions. The BAC and PIM removed the siloxane challenge to below 1 ppt under humid conditions. After media saturation was reached under humid conditions, the materials were regenerated and siloxane removal efficiencies were re-examined. Only the PIM material was regenerable to below 1ppt efficiency levels.
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