Processes

Sublimation

Sublimation and de-sublimation processes are applied to certain substances which tend to decompose or polymerize at temperatures above their melting point. It is a process by which a product is transferred from its solid state directly to its gaseous state by adding thermal energy but without passing through a liquid phase. The reversal process is called de-sublimation. Typically, sublimation takes place at vacuum in the range of 1 to 100 mbar(a).

The most common application of sublimation and de-sublimation is the purification of substances. LIST has developed an economic process which allows the reliable, continuous sublimation and de-sublimation of products.

Properties

  • Effective self-cleaning to minimize dead zones, product accumulation and product degradation

  • Excellent kneading and mixing for better homogenization

  • Low shear processing

  • Effective heat transfer

  • High surface renewal efficiency

  • Large free vapour volume

  • Precise and uniform temperature control due to large heat transfer areas

  • Continuous processing

  • Wide and flexible range of average residence times

  • Wide and flexible range of average residence times

  • Reliable process scale-up from pilot to industrial units

Examples

Ferrocene
Ferrocene and its derivatives are antiknock agents used in fuel

Organic compounds
Organic compounds such as certain pharmaceutical intermediates, food additives, dyestuff, etc.

Do you have any questions?

Downloads

CPP Sublimation

The most common application of sublimation is separation of volatile solids and purification of substances. This paper explains the p-T diagram of a pure substance, and discusses existing processes and their operation.
Language: English / Year: 1995

Sublimation – ein nicht fluides thermisches Trennverfahren

Die Sublimation ist ein Verfahren der thermischen Stofftrennung und wird meist als Reinigungsverfahren angewendet, wobei die Knetsublimation unter Vakuum spezielle Vorteile bringt.
Language: German / Year: 1993

Sublimation – ein seltenes thermisches Trennverfahren

In diesem Beitrag wird das typische p-T-Diagramm einer reinen Komponente als Ausgangspunkt dargestellt. Danach werden die bisher bekannten Verfahren und Arbeitsweisen mit Nennung der bekanntesten Sublimationsapparate und die speziellen Vorteile der Knetsublimatoren erläutert.
Language: German / Year: 2002

Sublimation – ohne flüssige Zwischenphase

Die Sublimation gehört wie die Destillation, Rektifikation und die Trocknung zu den Verfahren der thermischen Stofftrennung. Sie wird meist als Reinigungsverfahren angewendet, wobei die Sublimation aus einer Trägergasphase als spezielles Verfahren einer stofflichen Gewinnung betrachtet werden kann. Nachfolgend werden die speziellen Vorteile von Knetsublimatoren erläutert.
Language: German / Year: 2001

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