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Reflux is the liquid condensed from the
rising vapor which returns to the pot flask.
The
Reflux ratio is the ratio between the boil
up rate and the take-off rate. Or in other words, it is the ratio
between the amount of reflux that goes back down the distillation column
and the amount of reflux that is collected in the receiver (distillate).
If 5 parts of the reflux go back down the distillation column and 1 part
is collected as distillate then the reflux ratio is 5:1. In the case
where all the reflux is collected as distillate the reflux ratio would be
0:1. If no distillate is collected then a reflux ratio is not
assigned. Instead we call this "total reflux" or equilibration.
The higher the reflux ratio, the more vapor/liquid contact can occur in
the distillation column. So higher reflux ratios usually mean higher
purity of the distillate. It also means that the collection rate for
the distillate will be slower.
The M690 microprocessor allows a
different reflux ratio to be set for each temperature fraction being
collected. This allows solvent recycling protocols to be optimized
for each waste solvent type.
Other parameters:
Equilibration Time
Heating Rate
Open Cut
Close Cut
Auto Shut Down
Temperature
M690 Parameters
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