Fractional sublimation
The Fractional sublimation is a separation method of chemistry , which uses the separation of solid mixtures differences in the sublimation of the substances.
The sublimation is carried changes in temperature or the pressure ( vacuum caused) within a sublimation apparatus.
This fact is exploited in the chemical-technical process of fractionated sublimation. The mixture of substances to be separated is heated under reduced pressure in the first chamber. Sometimes an inert gas is introduced to promote the transport of substances. The temperature in the second or third chamber is lower than in the first chamber, so that the sublimate fractions can be obtained there as a solid . The process can also be used several times in succession in order to increase the purity of the substances obtained.
The process is in chemical engineering, not only for the production of chemically pure substances or preparation used by waste, but also as a chemical analysis method used.
See also
Individual evidence
- ^ Walter Wittenberger: Chemische Laboratoriumstechnik , Springer-Verlag, Vienna, New York, 7th edition, 1973, pp. 187-189, ISBN 3-211-81116-8 .