Ethylene removal media are usually composed of pellets of porous solids
such as activated alumina, vermiculite, and silica gel that have been impregnated
with potassium permanganate (KMnO4). The alumina functions primarily
as the absorptive surface to trap the molecules of gas and is a carrier for
the permanganate. Potassium permanganate is a broad-spectrum oxidizing
agent that reacts with ethylene as well as with other contaminant gases.
When it reacts by oxidizing ethylene to ethylene glycol, a visible color
change occurs: fresh KMnO4 medium is purple in color but, after reacting
with ethylene, it turns brown. The color change occurs first on the pellet’s
surface and eventually penetrates the core, indicating the reactive capacity is
nearing exhaustion.
Ethylene removal media are usually composed of pellets of porous solidssuch as activated alumina, vermiculite, and silica gel that have been impregnatedwith potassium permanganate (KMnO4). The alumina functions primarilyas the absorptive surface to trap the molecules of gas and is a carrier forthe permanganate. Potassium permanganate is a broad-spectrum oxidizingagent that reacts with ethylene as well as with other contaminant gases.When it reacts by oxidizing ethylene to ethylene glycol, a visible colorchange occurs: fresh KMnO4 medium is purple in color but, after reactingwith ethylene, it turns brown. The color change occurs first on the pellet’ssurface and eventually penetrates the core, indicating the reactive capacity isnearing exhaustion.
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