Linde Aktiengesellschaft

Wolfgang Baldus

Wilhelm Lehmer

An inspissate of a solution having a solvent which can be crystallized out by cooling is passed into contact with an internally cooled surface through which a coolant is circulated. Relative vibration is established between the solution to be cooled and the surface with at least the vibration of the surface being interrupted periodically or aperiodically. The solution and the surface can be vibrated separately in alternating periods.

Intermittent vibration in fractional crystallization

Cold is generated, according to the invention, by compressing a refrigerant and expanding the refrigerant isentropically in a nozzle. Advantageously at least a part of the expanded refrigerant is passed in indirect heat exchanging relationship with the portion of the refrigerant prior to expansion. An expansion machine can be used to work-expand a portion of the compressed refrigerant with the expanded gas returned to the compressor. The balance of the compressed stream is expanded in the nozzle.

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Pullach, Germany

Wolfgang Baldus