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Short Path Distillation
Short path distillation gets its name from the distance in which the vapor stream is condensed. In this case, the evaporator wall generates the vapors as the feed moves by gravity, while being agitated and distributed evenly, down the evaporator wall. The vapor stream travels a "short path" directly to the condenser which is located within the evaporator chamber. Since the vapor stream is immediated condensed, the short path distillation process precludes the vapor from forming vapor pressure. This allows ultimate pressures of 0.001 mbar to be attained. This also allows heat sensitive materials to undergo purification at much lower temperatures preventing degradation. It also allows for very high ambient equivalent temperatures to be achieved. Short path distillation in a plant setting is a continuous process.
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Working Principle
In a short path evaporator, the rotor cage assembly surrounds an internal condenser and revolves at moderate speeds. Feed enters above the distributor and is spread into a thin film on the inside surface of the shell. The wiper blades gently agitate the film. The product travels down the heated surface in a very short time while generating vapors. These vapors flow through the rotor and condense on the internally mounted condenser. This short vapor path minimizes pressure drop. The distilled product and the remaining bottoms are taken out through separate outlets.
Applications
Short path distillation units are used in High vacuum distillation of heat sensitive materials like vitamins, flavoring agents or pharmaceutical intermediates, Epoxy resins, plasticizers and stabilizer, fish oils, omega-3 fatty acids, fatty acid derivatives, glycerides, tocopherol and tocotrienols, fine Chemicals, silicone oils, and higher alcohols
SPDUs also find applications in Re-refining of spent lube oil Purification of natural and synthetic waxes Product recovery from distillation column residues
Capacity
To suit application
