Velp Scientifica
– UDK139 Operating Manual
10004762/B5
5
Introduction
Steam distillation is applied in the laboratory for the fractionation of water insoluble
liquids or solids according to Dalton's law of partial pressures in a gas mixture.
It is also used for stripping chemicals from mixtures or solutions after displacement of
the ionic equilibrium by adding acids or bases, as in the well known Kjeldahl's
method for total Nitrogen determination.
The Kjeldahl method remains the most used method for determining Nitrogen and
protein contents in foods and feeds (official methods).
This is simply due to its precision and reproducibility.
Since its initial design, many improvements have been introduced aimed at reducing
energy consumption, space requirements and sample quantities.
The UDK 139 Semi-automatic Distillation Unit
has a
color touch-screen
with
electronic control for simple and user-friendly programming of parameters such as
distillation time, the volume of reagents such as sodium hydroxide, water and the
regulation of steam production from 10 to 100% in order to carry out Semi-automatic
distillation.
By modifying the distillation time and steam output it is possible to carry out fast or
slow distillation according to the product being analyzed. For example, the distillation
time for the determination of the protein content according to the Kjeldahl method
can be reduced to three minutes. In other cases (e.g. volatile acids in food products),
the distillation time can be increased to 30 minutes or more.
Analysis times are reduced thanks to the
optimization of the applications
:
10 programs that can be customized directly by the user.
NOTE
: the software can be browsed directly from the touch-screen. Select the option
by hand, using a stylus or a mouse.
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