IKA RV 10 control Instrucciones De Manejo página 33

Useful information
Distillation is a thermal separating process for liquid compounds based on
substance-specific, pressure-dependent boiling points through evaporation
and subsequent condensation.
The boiling point temperature decreases with decreasing external pressure
which means that work is usually done under reduced pressure. In this
way the heating bath can be maintained at a constant temperature (e.g.
60 °C). Using the vacuum, the boiling point is set with a steam tempe-
rature of approx. 40 °C. The cooling water for the condensation cooler
should not be warmer than 20 °C (60-40-20 rule).
A chemical resistant membrane pump with a vacuum controller should be
used to create the vacuum. The pump is protected from solvent residue by
the addition of a Woulff bottle and/or a vacuum separator.
Working with a jet pump to create a vacuum can only be recommen-
ded to a limited extent as the solvents may contaminate the environment
when using these systems.
Speed, temperature, piston size and system pressure all affect the evapo-
rator air capacity.
The optimum capacity of the flow-through condenser is approx. 60%.
This corresponds to condensation on approx. 2/3 of the cooling coil. With
larger capacities there is the risk that the uncondensed solvent vapour
will be extracted.
In order to prevent this, the condenser loading safety monitoring system
can be activated. Before activating the safety monitoring, first carry out
several distillations, noting the value given under menu "Settings", menu
option "Drive", item "Maximum heat rejection rate". Now calculate the
heat rejection rate using the following formula:
Heat rejection rate threshold = maximum heat rejection rate * 1.3
Enter this value under menu "Settings", menu option "Distillation", item
"Heat rejection rate threshold". The device will now stop the measure-
ment and issue an error message if the threshold for the condenser is
exceeded. If the configuration of the condenser equipment or the dis-
tillation process is modified, then it may be necessary to re-evaluate the
maximum condenser loading.
The factory setting for this value is 900 W.
Vacuum equipment: The RV 10 control rotary evaporator is fitted as standard with a two-position vacuum controller and a pressure measuring chamber
with bleed valve.
The correct vacuum valve must be selected from the following list and installed according to the type of vacuum source used at the
customer site.
Vacuum source
Central vacuum system
Laboratory vacuum system
Single pump system
The device is equipped with a piston-operated safety mechanism. A va-
cuum may form in the glassware assembly if there is a power outage; this
will be vented when the system is switched on again. If the power cuts
out, the evaporator piston is automatically lifted out of the heating bath
by an integrated gas spring.
CAUTION! The maximum load (evaporator piston and contents) is 1.5
kg for a permissible safety lift with no power for glass apparatus with
diagonal or vertical condenser.
When using other types of condensers such as dry ice or intensive con-
densers as well as when using return distillation distributors with slip-on
condensers, it may be necessary to reduce the mass of the media to com-
pensate for the mass of this additional glassware. Thus, prior to distilla-
tion, check whether the lift goes up without power when laden with the
glass and distillation material.
In addition to offering a full range of manual and semi-automatic
evaporation operating modes, the RV 10 control rotary evaporator
can also be used for fully automatic, quantity-controlled evaporation
processes. Standard fittings for fully-automatic operation include a
two-position vacuum controller, a cooling water differential tempera-
ture measurement sensor, and a cooling water flow rate meter. The
device is designed for operation with a cooling water supply system
(e.g. laboratory thermostat), but can also be run off a water supply
line. Please refer to the Technical Data for information on cooling water
pressure, temperature constancy, and flow rate.
We recommend using the RV 10.5001 water regulator valve when opera-
ting directly off a water supply line.
This valve allows the cooling water flow rate to be adjusted and automa-
tically cuts off the cooling water supply on completion of the distillation
process.
The RV 10.5002 water filter can be used to prevent particles of dirt pas-
sing from the water supply line into the valve mechanism.
If pressure reduction is required, we recommend fitting the
RV 10.5003 pressure regulator valve in the pipe immediately downstream
of the pick-off point.
Automatic volume-dependent distillation: The apparatus must be brought
up to operating temperature. This is achieved by conducting a test dis-
tillation.
Please observe the specified values during automatic distillation (see
"Technical specifications").
Code
Large-scale vacuum source for
multiple consumers of different
types across a site;
generally a fixed-pipe installation.
Laboratory-based RV vacuum pump
with multiple similar consumers,
e.g. 2 rotary evaporators/1 pump.
One rotary evaporator with one pump/
desktop operation.
Pump is deactivated when target pressure
reached and reactivated automatically.
Valve
RV 10.4001
RV 10.4002
RV 10.4003
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