Community Research and Development Information Service - CORDIS

Purification of organic compounds by dry sweating in a rotating unit

A new technology to purify organic solid compounds by melt crystallization has been developed. Solid particles up to few millimetres in size are most suitable for the treatment. The technique can be easily implemented as a section of a chemical production plant. Both the cost of investment for the construction, and the energy consumption for the operation, are low in comparison to traditional technologies. It is based on the dry sweating unit operation, that is partial melting of the solid induced by the contact with a hot gas stream, and is typically applied to improve the purity grade from 95% to 99.5%. The molten fraction is lower than 15% and the impurities can be concentrated in the residue molten stream up to one order of magnitude. The energy consumption is 83 W per kg of treated solid.

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