ATFD/ATFE (Agitated Thin Film Dryer / Evaporator)

An Agitated Thin Film Dryer / Evaporator (ATFD/ATFE), also known as Thin Film Evaporator (TFE) or Wiped Film Evaporator (WFE), consists of a jacketed shell precision machined from inside and a rotor having Flexible or Rigid blades that maintain a close clearance from the shell.

A feed distributor at entry point distributes the liquid in a thin film on the heated wall. The high speed rotor further spreads and intensely agitates the film as it flows down. The vapors produced rise upwards, counter-current to the liquid and, pass trough a cyclone separator mounted in the top section. Thanks to the large cross-sectional area, the pressure drop across the evaporator is low and operate in the vacuum range as low as possible.

Special Applications

• ZLD Plant of bulk drugs, intermediates, fine chemicals, glycols, used lubricating oils, fatty acids and their derivatives, rubber chemicals, amines and esters
• ATFE is used in pharmaceutical Industries for concentration of products.
• Processing of oleoresins, enzymes, plant extracts, milk products, juices and sugars
• Recovery of contaminated solvents & products from residues
• Purification of biodiesel and recovery of glycerin
• Recovery of products from residues
• Recovery of solvents from contaminants
• Pre-concentration before ATFD or SPDU
• Pre-concentration before ATFD or SPDU
• Textile
• Pharmaceutical
• Food

Features

• Residence time of a few seconds with a narrow spread, an important feature for heat sensitive products
• Scale formation on the heat transfer surface is reduced due to the intense agitation of the liquid film
• Scale formation on the heat transfer surface is reduced due to the intense agitation of the liquid film
• Low product holdup, ideal for hazardous applications
• Continuous operation
• Less maintenance
• Easy to start, operate and shut down
• Heat transfer area is high
• One shot concentration no re-circulation is required
• Can operate with flexible operating parameter