The normal boiling temperature of water is 212 degrees (f) or 100
degrees (c) at sea level. Boiling Temperatures normally decrease as
altitude increases. If your results are -above- the normal sea level
number, then you are either below sea level or you have a -slight-
restriction in your column (from packing stuffed in too tight) that
is raising pressure. You may also have a thermometer that is
misreading or is in the wrong place for accurate readings. I would
investigate this last reason before making any major changes
You did not mention that your column was surging and moving around
violently and making ugly noises during your run, so I would not
assume that a seriously blocked column is the reason.
You can check your thermometer by placing it in a pot of boiling
water on your kitchen stove. See what number it says that water is
boiling at and adjust all of your other expected numbers
accordingly. for example if water boils at 218 then your ideal
ethanol product number should be 6 degrees higher also. Then make
sure that the correct portion of the thermometer is in the vapor
stream while things are in operation.
--- In email@example.com, "tfurey7" <tfurey7@y...> wrote:
> I have built a valved reflux still and I did a second water run
> night and I had the same results as the first run. The thermometer
> was reading 218 degrees F before I started getting a steady flow on
> my output line. I reduced the gas to maintain 212-213 degrees F and
> the flow just about stopped. Is this normal? I had the reflux valve
> completely closed and the output open all of the way.
> Question #2. How long should it take to distill 250ml?
> With the temperature up, the reflux valve closed and the output
> it took me about 10 min., is this normal?