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.
Ferrocene and its derivatives are antiknock agents used in fuel
Organic compounds such as certain pharmaceutical intermediates, food additives, dyestuff, etc.
- 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
- Narrow residence time distributions (plug flow)
- Wide and flexible range of average residence times
- Reliable process scale-up from pilot to industrial units