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>> John wrote: >> >> If the cannister is a circular tube filled with "large surface >> area" absorbent material with the CO2 rich gas entering on >> say the bottom you'll see spent material on the bottom, >> than an active scrubber "ring" moving upwards and then >> above the currently active region, the unspent scrubber material. > > Rich wrote: > >Actually, I think it's more of a zone than a ring. I'm not sure how >broad this zone would be, and I imagine it depends on the canister >design, but I imagin it could span the entire height of the canister. Our scrubber is a tube made of plexiglass. Flow is linear and the shape is a stack. Hence we can see the indicator dye change colors. We can also feel the reaction heat. It does "appear" that there is a disk shaped reaction front that moves up the scrubber bed as the scrubber is used. Upstream of the disk the scrubber material is cold down stream of the disk the scrubber material is hot. Hence it looks like John is correct. I'm guessing that the Cis Lunar has a radial flow stack scrubber that would prevent observing this phenomena ( care to comment Rich :). I recall reading of a similar observation in disk scrubbers ( ie Mark 15/16s ) where a uniform front of indicator dye has changed colors. I would guess that the reaction is concentration dependend so that through some thickness T1/2 half the CO2 is removed. Through the next T1/2 half the remaining CO2 is removed ( which is 1/4 of the original amount ). If the thickness T1/2 is small enough then there is some narrow band of scrubber material over which "most" of the reaction occurs. By the time the gas exits the scrubber it has almost no CO2 and hence little reaction occurs. Barrie
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