BUSS-SMS-CANZLER GMBH

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.

Systems & Modules SMS designs, manufactures and supplies complete systems & modules for evaporation, drying and membrane applications. Our scope of supply includes: Consulting / Feasibility Studies Pilot Test Process Design Plant Engineering Project Management Procurement / Manufacturing / Delivery Erection / Installation Start-Up / Commissioning After-Sales Service Skid-Mounted Modules For more than 40 years SMS has been supplying skid-mounted units for the benifit of our customers. The skids are fully assembled, including piping, wiring and testing in the SMS Workshop or in our partners´ workshop. The modular design significantly reduces the required amount of work for assembly and start-up which minimizes the downtime of the existing plant equipment and - as a result - just minor effects occur on the current production.

Filmtruder and Viscon processors are specialized in the concentration, purification and devolatilization of products with viscosities up to 10,000 Pa (s) and are characterized by the following properties: Agitated thin film processing Unequaled surface renewal, resulting in the lowest residual volatile content Typically no stripping agents required Large free vapour volume compared to product hold-up, allowing very high volatile removal in one stage A successful thin film processing system consists of the right processor design integrated with properly engineered subsystems. SMS can provide a complete system, including installation and start-up services, or full engineering and design documentation to allow you to add the necessary subsystems for our thin film processor.

The vertical thin film dryer consists of a cylindrical, vertically arranged body with heating jacket and a rotor inside. The rotor is equipped with rows of pendulum blades all over the length of the dryer. The hinged blades spread the wet feed product in a thin product layer over the heated wall and mix the product layer material intensively. Therefore the volatile components evaporate continuously from the product layer with high evaporation rates. The hinged blades are designed with a minimum gap to prevent fouling of the heating surface by product, but are never in contact with the heated wall. The product enters the dryer at its top. The evaporation starts after heating to the boiling point. In the slurry zone first solids are formed and with advancing evaporation of the volatiles and continued shearing by the hinged blades the paste breaks up to powder. The final solid product is discharged by gravity at the bottom of the dryer via a suitable air lock.

The Large Volume Processor program consists of horizontally arranged, heated reactors with twin (co- or counterrotating) shaft which provide intensive mixing and kneading. The highly versatile large volume processors Reasil and Reacom are characterised by the following advantages: Very large volumes The highest viscosity melts (up to 15,000 Pas) and solids can be processed efficiently Low shear processing Long residence times are achieved economically Mixing, devolatilization, reaction and phase change (from melt to solid) can take place in the same machine. A successful devolatilization or reaction system consists of the right processor design integrated with properly engineered subsystems. SMS can provide a complete system, including installation and start-up services, or full engineering and design documentation to allow you to add the necessary subsystems for our high volume processors.

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.

The wet product fed through the inlet nozzle is picked up by the rotor blades, applied on the hot wall and simultaneously conveyed towards the outlet nozzle at the opposite end of the body. The generated vapours are streaming counter-currently to the product flow and are leaving the dryer close to the feed nozzle. Evaporating and conveying capacity are adapted by the right rotor blade arrangement. Entrained particles from the dry zone are removed in the wet zone. Moisture levels of less than 1 % can be achieved. The residence time of the product is typically between 5 and 15 minutes. The outstanding heat transfer rate for hot solid products enables cooling of large amounts of solids in a compact machine compared to usually used cooling screws and without cooling air.In product melting like the melting of urea, the particles are heated up and molten inside the dryer. The melt can be mixed with other liquid and solid additives to improve the properties of the final products.

SMS offers sludge drying systems with horizontal thin film dryers for treatment of sludge from municipal as well as from industrial waste water treatment plants. Variations of this sludge treatment process are: Pre-drying up to 35 to 50 % dry solid content before incineration in fluidized bed incinerators 65 to 75 % dry solid content before combined incineration with garbage, composting or landfill Full drying up to 85 to 95 % before thermal utilization as bio-fuel for cement kilns, coal fired power stations, pyrolysis, gasification or other conversion processes before composting and agricultural usage as fertilizer and for soil reclamation In all these drying processes the thin film dryer is the first choice.

Short path distillation is a thermal separation technology operating at process pressures in the range of 1 to 0,001 mbar. It lowers the boiling temperature and is an excellent method for gentle thermal treatment of heat sensitive, high boiling products. The short path evaporator consist basically of a cylindrical body with a heating jacket, a rotor and an internal condenser. The rotor creates a mechanically agitated, thin product film on the heating surface inside of the body. By means of gravity the product flows down in a spiral path, whereby the volatile portion of the product evaporates. The vapour passes by the shortest route and with practically no pressure drop to the internal condenser. The non-volatile portion reaches the lower part of the evaporator and is discharged through the bottom product outlet. The residual vapours and inert gases flow through the vacuum nozzle to the vacuum system.

The Combined Fluidization Technology dryer (CFT dryer) offers an economic process for sticky products. CFT dryers combine the advantages of convective fluidized bed drying with contact drying. The CFT works with a hot mechanically fluidized bed. The feed material is distributed into this bed. It is fluidized by a rotating paddle system. Inside the fluidized bed the wet product is evenly distributed throughout the dry product. The volatiles evaporate instantly in contact with the hot particles, i.e. new solids are created at the location of evaporation. CFT dryers allow the handling of products, which cannot be handled in other types of contact dryers. Highly viscous, pasty, sticky, crust-forming states do not exist.