Thin Film Evaporator (TFE)
Thin Film Evaporator (TFE)
Mechotech engineers and manufactures the Thin Film Evaporator (TFE) as turnkey process equipment for the fast, gentle concentration of heat-sensitive liquids. The feed is spread as a thin, continuously renewed film on a heated vessel wall, so evaporation is rapid and the time the product spends on the heated surface is short. Mechotech lists the thin-film evaporator on its equipment slide alongside the falling-film evaporator, multiple-effect evaporator, spray dryer, freeze dryer and molecular distillation unit, and its Forced Circulation Evaporator page says thin-film and wiped-film evaporators use mechanical wiping for viscous, heat-sensitive liquids. The unit is designed around the client’s feed, throughput and target concentration, then fabricated, installed and commissioned by Mechotech as a single scope.
The Thin Film Evaporator is built in SS 316L (or a process-appropriate grade) around a heated vessel wall on which the feed is spread as a thin, continuously renewed film, with a vapour outlet to a condenser and a concentrate discharge, as Mechotech’s illustration shows with a drive motor at the top of the evaporator column. Electropolished product-contact surfaces, CIP connections and PLC-based control support operation under vacuum or at atmospheric pressure, depending on the heat sensitivity of the product. How the film is renewed, mechanically or otherwise, and the heating medium are confirmed in design. Capacity is configured to the customer’s requirement, and the unit is delivered with full documentation to support GMP qualification.
Technical Specifications
| Evaporator Type | Thin Film Evaporator (TFE) — heated-wall thin-film evaporator |
|---|---|
| Working Principle | Feed is spread as a thin, continuously renewed film on a heated wall for rapid evaporation with short residence time |
| Film Renewal | Mechanically assisted film renewal is described for thin-film and wiped-film evaporators on Mechotech’s Forced Circulation Evaporator page; the mechanism for a given unit is confirmed in design |
| Suited Feed Character | Heat-sensitive liquids (per this page); viscous heat-sensitive liquids (per Mechotech’s Forced Circulation Evaporator page) |
| Operating Mode | Vacuum operation (typical for heat-sensitive feeds) or atmospheric, configurable |
| Heating Medium | Configured to the process (steam, thermic fluid or other) |
| Product-contact Material | SS 316L (or process-appropriate grade), electropolished |
| Condensing System | Condenser, with vacuum system where vacuum operation is used (configurable) |
| Automation | PLC-based control (configurable to SCADA) |
| Cleaning | CIP-capable product-contact circuit |
| Capacity | Configured to requirement — pilot to commercial evaporation duty |
| Compliance | GMP hygienic design; full documentation for qualification |
Plant Capacities
| Scale | Typical Duty | Configuration |
|---|---|---|
| Pilot | Process validation on heat-sensitive feeds | Small evaporating surface |
| Production | Plant-scale concentration | Evaporating surface sized to the duty |
| Large production | Higher-throughput concentration | Larger surface or multiple units |
Evaporating area, drive and condenser duty are sized to the feed’s viscosity, heat sensitivity and evaporation duty; no fixed areas or throughputs are quoted on this page.
Manufacturing Process
Feed Introduction
The feed is pumped to the evaporator and distributed onto the heated wall.
Thin-Film Formation
The feed is spread into a thin, continuously renewed film on the heated vessel wall.
Evaporation
The film evaporates rapidly, with a short time on the heated surface; under vacuum the boiling point is lowered to protect heat-sensitive product.
Vapour Handling
Vapour leaves through the vapour outlet to the condenser, where it is condensed; a vacuum system maintains the pressure where vacuum is used.
Concentrate Discharge
The concentrate is discharged from the base of the evaporator to storage or the next process step.
CIP & Changeover
The evaporator and connecting lines are cleaned in place between batches or product changeovers.
Major Plant Equipment
- Thin-film evaporator with heated wall (SS 316L, electropolished)
- Drive motor (film renewal)
- Feed pump and feed distribution
- Vapour outlet and condenser
- Vacuum system (where used)
- Concentrate discharge and receiver
- CIP connections
- PLC-based control panel
Plant Output
Applications
- Concentration of heat-sensitive botanical and herbal extracts
- Pharmaceutical and nutraceutical intermediate concentration
- Food and flavour liquid concentration
- Viscous heat-sensitive liquids (per Mechotech’s Forced Circulation Evaporator page)
Key Features
Short Residence Time
A thin, continuously renewed film on a heated wall keeps the time the product spends on the hot surface short.
Gentle Concentration under Vacuum
Vacuum operation lowers the boiling point, which protects heat-sensitive feeds.
Mechanically Assisted Film Renewal
Mechotech’s sibling pages describe mechanical wiping for thin-film and wiped-film evaporators; the mechanism for a given unit is confirmed in design.
SS 316L, CIP-Capable, PLC Control
Electropolished SS 316L product-contact surfaces, CIP connections and PLC control support hygienic, repeatable operation.
Scalable Capacity
The evaporator is configured to requirement from pilot scale upward, with modular expansion.
Frequently Asked Questions
Does Mechotech supply the complete Thin Film Evaporator?
What capacities are available for the Thin Film Evaporator?
Which industries use the Thin Film Evaporator?
What is a thin film evaporator?
How does the Thin Film Evaporator differ from the Wiped Film Evaporator?
How does it differ from the Falling Film and Rising Film evaporators?
Does it run under vacuum?
What information is needed to specify a thin film evaporator?
Which related evaporation pages does Mechotech list?
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