WFF EVAPORATOR

A wiped film evaporator (WFE), is used ot separate and concentrate components from a liquid mixture using evaporation.

WORKING PRINCIPLE

The WFE (Wiped Film Evaporator) operates through a straightforward yet highly efficient process. The feed material is introduced at the top of the unit and evenly distributed along the inner shell surface by a rotating plate. Specially configured wipers continuously spread and renew the feed, forming a thin film that enhances heat transfer efficiency, even for highly viscous fluids.

As the low-boiling components evaporate, the vapor passes through an entrainment separator to minimize liquid droplet carryover. The purified vapor is then directed through a vapor line to an external condenser (if applicable) for liquefaction. In applications requiring minimal pressure drop, the evaporator's central section integrates a condenser, converting the unit into a short-path or molecular distillation system. Here, the vapor condenses on the external surface of the tube bundle and exits via a centralized condensate outlet.

Meanwhile, the high-boiling components flow along the shell wall and are discharged through the product outlet. The wipers play a critical role in ensuring smooth downward movement of the product. To maintain optimal operation, the concentrate must remain fluid at the processing temperature. Various rotor designs are available to accommodate different product viscosities, operating pressures, and process requirements.

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MAIN DESIGN FEATURES

Low rotational speed
No bottom bearing
Higher power to take care of feed fluctuations
Chevron rotor with interchangeable panels for ease of cleaning
Double groove gasket for high vacuum WFE
Conical bottom with auger
Top vapour outlet Large internal condenser
Swing / Hinge wiper blades
Open rotor (no entrainment separator)

ADVANTAGES

Evaporation at low operating temperature
Short residence time (few econds)
High heat transfer coefficients
Low pressure drop on vapor side
No degradation or loss of active ingredients
Self cleaning\wiping of the heat transfer surface
Suitable for viscous liquids
Continuous operation
Low maintenance
The scraper system pushes the liquid from a thin film through the rotation process, and hence it provides the appropriate evaporation efficiency and also reduces its operating time.
The high-precision pipe made from glass allows the liquid to create a unified thin film over the hot surface.
The Scraper system is built of SUS 316L and PTFE; all the other parts that come in contact with the liquid or gas are usually created from high borosilicate glass 3.3 and PTFE, as both the elements have an excellent corrosion resistance properties.
You can control the temperature and keep it to the absolute level. The Agitated Thin Film Evaporator can reach up to 260°c temperature.
A Self-cleaning roller Model, as well as the Scraper Model film-forming systems, are available with us.

INDUSTRY

Distillation, separation, concentration, stripping, deodorisation, degassing, reaction
Heat-sensitive, viscous, fouling and foaming products
Continuous processing
Pharmaceuticals: Purification of active pharmaceutical ingredients (APIs), concentration of heat-sensitive compounds, and removal of solvents from drug formulations.
Chemicals: Separation and purification of fine chemicals, resins, polymers, and specialty chemicals.
Food and Beverage: Concentration of flavors, fragrances, essential oils, and natural extracts.
Petrochemicals: Recovery of valuable hydrocarbons, removal of volatile impurities from oils, and purification of lubricants.
Biotechnology: Processing of bio-based materials, including the concentration of enzymes, proteins, and other biological products.

MODELS AND TECHNICAL SPECIFICATIONS

Model	Surface [m2]	Height [mm]	Inner Diameter [mm]
WFE-001	0.01	85	38
WFE-002	0.04	185	70
WFE-003	0.05	230	70
WFE-004	0.10	260	125
WFE-005	0.15	390	125
WFE-006	0.30	480	200
WFE-007	0.06	1,100	83
WFE-008	0.10	1.250	100
WFE-009	0.15	1.600	125
WFE-010	0.40	2.000	200
WFE-011	0.80	2.200	260
WFE-012	1.50	3,600	350
WFE-013	2.40	3.800	500
WFE-014	4.50	4.000	630
WFE-015	6.00	5,500	800
WFE-016	8.00	6.400	800
WFE-017	10.00	6,600	1,000
WFE-018	15.00	8.000	1,250
WFE-019	20.00	9,200	1,250
WFE-020	25.00	10.100	1,400
WFE-021	30.00	12,000	1,600
WFE-022	35.00	13.200	1,800
WFE-023	50.00	13,700	2,000
WFE-024	80.00	15,500	2,600