Dalal Engineering Private Limited

A Falling Film Evaporator is used for concentration and evaporation of relatively low viscosity liquids. Steam, hot water or hot oil is used as the heating media and the process is carried out under atmospheric or vacuum condition. The Evaporator is used for volume reduction where dilute products are concentrated to a medium concentration.
                                               The process is continuous. The liquid to be concentrated is fed from the top and a distributor ensures proper feed distribution in each of the tubes. The distributor also ensures that all tubes are wetted and that the liquid flows in a film. The liquid and vapour both travel vertically downward. Due to a relatively thin film, the heat transfer coefficient is better than that obtained in reactors and simple shell and tube evaporators. If further concentration is required, the concentrated product can then be fed to the Wiped Film Evaporator.

Avail from us a precision engineered range of wiped film evaporators.

Introduction
Agitated thin film dryers are used for continuous drying of heat sensitive products with total solvent recovery. This is ideal for drying pharmaceuticals, bulk drugs and intermediates, organic and inorganic salts.

Working Principle
The drying in a agitated thin film dryer is a continuous operation under vacuum. Operating pressures can be as low as 1 mbar and operating temperatures can be as high as 350oC. Drying time depends on material being dried, amount of solvent to be removed, desired final moisture content, permissible jacket temperature etc.

Salient Features
Feed can be processed without pretreatment or dilution.
Full solvent recovery of organic solvents.
Thermal efficiency exceeds 90%.
Fine powder of uniform consistency eliminates pulverizes downstream.
Indirect heating and drying in absence of air is effective for heat, light and oxygen sensitive products.