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During the distillation we want to collect pure solvent in one receiver
and have contaminants collected in separate receiver or left is the pot
flask (boiler). Normally an automatic valve or automatic fraction
collector is used to direct the distillate to the desired receiver
depending on if it is a contaminant or pure solvent. This decision
is usually made by observing the vapor temperature in the top (head) of
the distillation column. If the temperature corresponds to the pure
solvent then the valve can be activated to direct the solvent to the "pure
solvent" receiver. Alternatively, if the vapor temperature
corresponds to the contaminant, then the valve can be activated to send
the contaminant to the the "contaminant" receiver.
The M690 microprocessor
allows up
to 8 temperature fractions to be collected for each solvent recycling
protocol although 1 or 2 fractions is almost always sufficient. An
automatic two way valve is most commonly used to direct the distillate.
In some cases an automatic fraction collector with 4 or 8 places is used
to direct the distillate.
Each temperature fraction
has an "Open Cut" and a "Close Cut". The Open Cut is the temperature
at which the fraction will begin to be collected and the Close Cut is the
temperature at which the fraction will stop being collected. Up to 8
cuts or fractions can be taken for each solvent recycling protocol.
This allows maximum
flexibility in optimizing each solvent recycling protocol.
Equilibration Time
Heating Rate
Reflux Ratio
Auto Shut Down
Temperature
M690 Parameters
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