3rd run with new 2" by 36" reflux with 25qt boiler. Each time after 3-4 hrs of holding steady at 79C the temp. starts to drop off going lower and lower till I have to jack up the heat (propane).
It's not a big problem, I just have to keep adjusting for the hour, but with other stills I've ran or been around the temp. starts to go up when it gets close to the end.
I use SS scrubbers at the bottom , raschig in the middle, and SS again at the top (because of the cooling tubes running through the colunm),1st time with all copper scrubbers, but same thing.
Temp. dropping
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