Falling film evaporators - Import export

The falling film principle requires an even distribution of the feed liquid. To achieve this distrubution one or more distribution trays are located in the top head of the evaporator over the complete tube sheet. Our proven distribution system makes sure that the inner surface of each individual tube is properly wetted. The liquid film moves down the tubes by gravity force. Heat applied through the tube wall effects boiling-off the light fraction from the film. The picture shows a co-current operating evaporator with vapour and liquid leaving the bottom of the evaporator into the separator vessel.

Licorice root enters crushing machines after cleaning and drying by modern machines. The crushed roots are transferred to all-steel extractors and boiled in a specific process by steam to extract the root. The root extract is transferred to all-steel tanks and the impurities are completely separated from the extract in this level, and then the extract without impurities is passed through special filters again for more safety. Finally, in order to concentrate, the dilute extract enters the falling film vacuum evaporator and the thin film evaporator. Our trading company offers licorice liquid extract with concentrations of 40 to 70%.

The SMS thin film evaporator type HYVAP serves the increasing demand of the pharmaceutical industry for continuous concentration of heat sensitive, viscous and fouling products. Hygienic design for the pharmaceutical industry The HYVAP is a horizontal thin film evaporator that allows easy access and inspection of the interior and controlled and reliable CIP cleaning. The technology of the HYVAP combines the proven advantages of our conventional horizontal thin film evaporators DKH with the following new features: • Cantilever rotor design • Comfortable rotor extraction • No bearing in product space • Mechanical seal in hygienic design • Electro-polished surfaces • Sight glasses for inspection during operation The new HYVAP DZH offers the hygienic design that meets current GMP requirements. The evaporator sizes range from 0.1 m2 for laboratory to 2.0 m2 for industrial applications. LP steam as well as hot water can be applied as heating media.

For the thermal separation of a mixture a thin film is produced at the heated wall of a cylindrical or conical evaporator. A distribution ring on the rotor distributes the liquid evenly across the periphery. Then, the blades fitted at the rotor spread the liquid as a thin film of min. 0.5 mm over the heat transfer surface. The model concept for the flow in the thin film evaporator assumes that prior to each rotor blade a bow wave is formed. In the gap between the rotor blade and the heating surface, fluid is supplied from the bow wave of a highly turbulent area with intense heat and mass transport. This results in a good heat transfer performance even with viscous products. In addition, the formation of deposits is avoided and the intensive mixing also protects temperature-sensitive products from overheating.