Niro supplies two types of extractors: Continuous and Batch-wise.
In true continuous extractors solids are transported by helicoidal screws placed in a tilted trough with heating panels. The hot extraction liquid flows downwards through the solids, thereby absorbing the product media.
The conventional continuous extractors use a system of batch-operated percolator columns. The solids are fed into the vertical placed percolator tubes and hot extraction liquid flows downwards. Extraction takes place under pressure.
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The Battery FIC™ - The conventional continuous extractor uses a system of vertical batch-operated percolator columns
The conventional continuous extractors use a system of vertical batch-operated percolator columns. The circular layout of the columns provides a more compact design.
The most up-to-date processing recognizes the importance of:
- Optimum raw material handling and preparation, including pre-moisture - right up to the filling of the columns
- Selective introduction of extraction medium at two different stages
- Separation of extracted solids in two extracts (split or double)
- Minimum residence time of extracted solids by maintaining high extract flow times
The Countercurrent CONTEX™ - Features true continuous counter-current extraction
The Niro CONTEX™ features true continuous counter-current extraction: The solids (in a suitable form) are fed by gravity or metered by volume to the lower end of the process-vessel and are transported upwards through the extractor by two counter-rotating mirrored helicoidal screws with a controlled slip. The solids pass in the form of two overlapping cylinders, rotating at approximately half the rate of the screws.
The fresh extraction liquid enters at the top and flows via inclination-controlled gravity down as a submerged stream in the bottom half of the cross-sectional area through the slowly rotating solid in true, well-controlled countercurrent with plug-flow in both phases. The speed of the screws is adjusted to give the necessary residence time for the solid. The flow of liquid is adjusted independently to provide optimal concentration of the extract.
The extract leaves the lower end through special self-cleaning filters and a level-control reservoir. The extracted solid is slightly squeezed at the top and continuously discharged.
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