SP Scientific VIRTIS 2K, Руководство оператора

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Rev 007, 10/11 25
© SP Scientific 2011
Chapter
6
Cold Trap Condenser
Overview
Under conditions of high vacuum, vapor pressure of the solvent collecting on the
condenser is much lower than that of the product. When vapor molecules leave the
product in a vacuum concentrator, they migrate toward low-pressure areas in the
condenser. Upon contact with the condenser, the vapors release their heat energy
and condense. Whether or not ice forms is dependent on the chemical properties of
the solvent. Efficient evaporation rates are dependent on maintaining this vapor
pressure differential.
These migrating vapors can be pulled directly into the vacuum pump if condensation
does not occur. BenchTop series freeze dryers can be utilized as a Cold Trap
Condenser Module to condense and collect vapors being driven out of a product in a
vacuum concentrator. Condensing the vapors prevents them from migrating to the
vacuum pump and causing damage.
Product Requirements
Before using a Cold Trap Condenser, consider the following:

Freezing and condensing points of solvents.

Overall volume.

Solvent properties, such as toxicity.
Note: This process is completely product dependent, so each application will vary in terms of
temperature requirements and process time.