Isolation of valuable substances from a liquid

In many cases, the remaining solid is the valuable material that you want to isolate by evaporation and vacuum drying. Sometimes it's the other way around: The evaporating medium is then the valuable substance, which is condensed into a liquid by cooling.

In general, thermal drying in a vacuum mixer dryer only makes economic sense if the mixing goods have been mechanically dehumidified beforehand. Suction filters, chamber filter presses, vacuum membrane filters or centrifuges, for example, are used for mechanical dehumidification. Some liquids are both a solution and a suspension. They cannot be dehumidified mechanically and must be thickened by evaporation.