Simultaneous distillation–extraction: preparative recovery of volatiles under mild conditions in batch or continuous operations
✍ Scribed by P. Pollien; A. Ott; L. B. Fay; L. Maignial; A. Chaintreau
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 213 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0882-5734
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✦ Synopsis
In a previous publication, a preparative apparatus was developed and optimized for simultaneous distillation±extraction (SDE) based on a theoretical model. In this paper, its performances were tested under various working conditions using a model mixture of ¯avourings. Separations were achieved at boiling water temperature as well as under mild conditions, which reduce artefact formation (room temperature, reduced pressure). High recoveries were obtained for batch experiments, but the boiler can also be fed from an external tank for continuous operations. This permits consideration of the preparative isolation of volatiles on a laboratory scale for subsequent fractionation and analysis, as well as industrial scale operations. Examples are given for real food ¯avours: one-step preparation and isolation of a reaction ¯avour, isolation of yoghurt and coee ¯avourings, recovery of natural benzaldehyde from wastewater. In addition, the use of a food-grade solvent to achieve SDE isolation yields an `edible' extract which can be reincorporated into a food without elimination of the solvent.