Re: New Bee Question
- Thanks Morgan and all of you that responded to my question.
Your answers and some additional information I found on the net puts
the cooling process in perspective. I did not realize when the
reflux action takes place it cools the packing which controls the
temperature and equilibrium within in the column. Thanks for the
Sorry Guys for the long e-mail leading up to Morgan's answer. I
thought it would help with my question. Having a mechanical
background I am prone to mentally dissembling a process and
reassembling it back into its most simplistic aspects. It's my way
of insuring problems are kept to a minimum. Many Thanks to all of you
for bearing with us New Bees, you provide a much needed service. I
promise to try to keep future question shorter. Maybe one day I will
be able to return the favor and help with a few answers rather than
--- In firstname.lastname@example.org, "bbornais" <bbornais@...>
> I agree...
> Cooling Management Sucks!
> --- In email@example.com, "morganfield1"
> <morganfield1@> wrote:
> > Hi Chuck,
> > I may be way off base here, but it sounds to me that what you
> > there is a CM (coolant management) valved reflux still. Questions:reflux
> > A; Does this still have a Liebig condensor?
> > B; If so, do the coolant lines run from the cross tubes to this
> > liebig condensor?
> > C; Are there seperate valves controlling water flow to the
> > tubes and the condensor?
> > Here's my take. If this is indeed a CM still, the amount of
> > controlled by coolant flow, so far so good. When you put the
> > into full reflux, the temp will stablize and hold. As you allow
> > vapor to pass thru the column, not all of the condenset is
> > back into the column, therefore it is not cooling the packing (asparagraphs.
> > much) and the temp will rise slightly. You can increase the
> > flow to the crosstubes, but you will slow down product flow, and
> > temp will rise again. These stills can be very fussy, I had a cm
> > it was a PITA. HTH
> > Tip one, Morgan
> > --- In firstname.lastname@example.org, "chevisn7" <chevisn7@>
> > wrote:
> > >
> > > Here is an excert I am reading from the operation of a Vale
> > > Still. One part of the explination makes no sense. My question
> > at
> > > the end of the excert.
> > >
> > >>
> > > My question relates to the wording in the following
> > > Allow your temperature to stabilize at the temperature of youryour
> > > desired product.
> > >
> > > Your temperature should remain constant for the duration of
> > > distillation. If necessary, adjust the flow of cooling water toensure
> > both
> > > maintain this temperature and ensure that the distillate being
> > drawn
> > > from your condenser is cool to slightly warm. If the distillate
> > > hot you should increase the flow of your cooling water to
> > thatat
> > > it is properly condensed.
> > >
> > > Here is my question. How do you maintain a constant tempeture
> > thethe
> > > top of your column. The thermometer is located at the top of
> > > vapor column directly above the scrubbers and the probe extendsis
> > a
> > > level of the cross over tube. The condenser is located in the
> > > side of the colum above the reflux valves. It would seem if you
> > > increased the flow of water in the condenser coil you would
> > increase
> > > the condensation of the vapor but it would not have any effect
> > the
> > > tempeture of the vapor colum. How then would you stabilize the
> > > tempeture of the vapor column? My guess would be to reduce the
> > > source but that could create eratic temps that would be hard to
> > > control. Someone with knowledge of this still design please
> > > how the tempeture of the vapor at the top of the vapor column
> > > controled.
> > > Thanks
> > > Chuck
> > >