The Agitated Thin Film Evaporator consists of two major assemblies: a jacketed shell precision machined from the inside and a rotor assembly that revolves at high speeds while closely fitting the shell.

The feed enters the shell tangentially and gets spread along the periphery by the distributor. The rotor blade tips move with a close clearance with the wall and spread the feed evenly on the heated surface into a thin film and further agitate it.

The heating medium in the jacket supplies the necessary heat for evaporating the volatile component of the feed. The vapor flows counter current to the film and gets cleared in the entrainment separator before leaving through the vapor nozzle. The concentrated product leaves the evaporator bottom through the concentrate nozzle.

The Short Path Distillation Unit (SPDU) works on the same principle as the Agitated Thin Film Evaporator. However, in the SPDU, the rotor cage assembly houses an internal condenser.

The feed enters above the distributor and gets spread into a thin film on the inside surface of the shell. The rollers on the rotor cage gently agitate the film. The product travels down the heated surface in a very short time while generating vapors. This vapors flow across the rotor and condense in the internally mounted condenser. This short vapor path eliminates pressure drop. The distilled product and the balance bottoms are taken out though separate outlets.

In a vertical dryer, the rotor blades are hinged. The feed enters the shell tangentially and gets spread along the inside surface of the shell into a thin film. The hinged rotor blades keep the film under intense agitation preventing any scale formation. The feed progressively passes through different phases like liquid, slurry, paste, wet powder and finally powder of the desired dryness. The vapors flow countercurrent to the film. The powder gets collected in a powder receiver at the bottom.

Horizontal orientation is required when the feed is in the form of a thick slurry, paste or wet powder. The fixed clearance rotor with screw elements prevent scale formation and convey the material from the feed end to the powder discharge end in a continuous fashion.

A combination of vertical and horizontal dryer produces best results when the feed is dilute and a dry powder is required as an end result- eliminating several processing stages like crystallization, filtration or centrifugation.

Separation of heat sensitive products with close boiling points is possible using structured packing exhibiting higher efficiency & lower pressure drop. Use of falling film evaporator & agitated thin film evaporator as reboiler improves quality & yields while processing heat sensitive products.

A Falling Film Evaporator consists of a calandria and separator. Feed is fed from the top of the calandria, which flows down the walls of the tubes as a film. As the liquid film flows down, heating is given from the shell side and hence evaporation takes place inside the tubes. Concentrated liquid leaves from the bottom of calandria whereas vapor goes to the separator. Vapor leaves from the top of the separator.

In a forced circulation evaporator, the feed material is introduced into the loop consisting of the calandria connected to the separator and axial flow pump. The axial flow pump re-circulating the material keeps the velocities of the fluid in the calandria high and scaling and fouling are minimized. Also, there is hydrostatic head acting on the fluid, which is in contact with the heat transfer surface in the calandria thus raising its boiling point and preventing the formation of vapor in the tubes.

The continuous liquid-liquid extractor (Asymmetrical Rotating Disc Contactor) consists of a vertical stack of mixer/settler stages. Each section is provided with an agitator for mixing. The settling zone is protected from agitation. The counter current flow is achieved by introducing the heavy phase at the top and the light phase at the bottom of the column. One of the phases in continuous and the other phase is dispersed. As the two phases pass in the opposite directions, they are subjected to repeated mixing and settling at each stage.

The extraction of the desired component takes place in the mixing zone where the agitator promotes uniform droplet formation and dispersion. The repeated mixing and settling at each stage creates and extraction capability that is equivalent of several washings in a batch kettle.

The downstream use of continuous evaporators and recovery units substantially reduces the solvents loss and operating costs.