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9
Functional Description
9.1
Distillation Apparatus for double distillation
LAUDA Puridest Bi Distillation Apparatus models PD 2 D, PD 4 D und PD 8 D work fully automatically. After switching
on the main switch oft he Distillation Apparatus, the green pilot lamp in the main switch (I) will light up.
The built-in solenoid valve will open. Water flows through the cooling coil of the glass condenser in the bi stage as well as
I
II
The water levels in the boilers are monitored by float switches (S2/S3), which switch on the heating element and protect
them from running dry. Additionally, the heating elements of both distillation stages are controlled by thermostatic low
water cut-offs (F1/F2), that protect the Distillation Apparatus from over-heating. Once the heating elements in the
mono boiler are beneath water level, they are switched on and bring the water to the boil. The produced steam rises up and
condenses on the cooling coil of the mono stage steel condenser. Mono distillate can be withdrawn through the borosili-
cate glass stop valve on the front of the unit. If the glass valve for withdrawal of mono distillate is closed, the mono-distilled
water is led into the boiler of the bi stage. Once the heating elements in the bi stage are below water level, the heating
elements are switched on. The mono distillate in the bi stage boiler is brought to the boil. The produced steam condenses in
the glass condenser of the bi stage and flows off as bi distillate through the outlet tube with dust cover that is screwed to
the condenser. The maximum water level in the bi stage boiler is limited by an overflow to the cooling water outlet. Opera-
tion mode of the heating elements in both stages is indicated by yellow pilot lamps (II and V). When the Bi Distillation
Apparatus is operated for the first time, the procedure until production of bi-distillate will take approx. 2 hours.
9.2
Bi Distillation Apparatus with separate water supply
Only factory installation into models PD 2 D to PD 8 D is possible.
The separate water supply serves to feed the mono stage boiler with pretreated water and the cooling coils with phospha-
tized or normal tap water. Tap water is fed to the boiler through a solenoid valve (Y2) with approx. 0.5 litres per minute.
Water that is not required flows off through the "outlet separate water supply". The condensers are fed with cooling water
through a second solenoid valve (Y1). The cooling water flows off through the cooling water outlet.
Owing to the separation of cooling and tap water, the water fed to the boiler is not pre-heated, the efficiency of the still is
therefore reduced by approx. 10-15 %.
9.3
Degassing
Carbon dioxide is released through the two exhaust tubes on the top of the unit.
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the cooling coil of the condenser in the mono stage, and fills
the mono stage boiler with tap water, regulated by a mechan-
ical water level regulator. The water level regulator deter-
mines the water level in the boiler. Water that is not used for
evaporation will flow off through the cooling water outlet
V
Puridest Bi Distillation Apparatus
09/2020
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