Rising Film Evaporator

A Rising Film Evaporator is a vertical type evaporator where the liquid feed enters from the bottom and rises through heated tubes. As the liquid heats, vapor forms and pushes it upward, creating a thin film along the tube walls. This process ensures rapid heat transfer, short residence time, and efficient evaporation, making it ideal for heat-sensitive products.

Widely used in food, pharmaceutical, chemical, and dairy industries, rising film evaporators offer high thermal efficiency, continuous operation, and reduced energy consumption. At Harsha Engineers, we design durable, stainless-steel rising film evaporators tailored to specific industrial needs, ensuring reliable performance, easy maintenance, and superior product quality.

Design Type: Vertical shell & tube heat exchanger with vapor–liquid separator
Material of Construction:
- Mild Steel (MS)
- Stainless Steel (SS304, SS316, SS316L)
- Special alloys (on request)
Tube Diameter: 25 mm to 50 mm (customizable as per process requirement)
Tube Length: 1 m to 8 m (depending on evaporation duty)
Heat Transfer Area: 1 m² to 1000 m² (scalable)
Heating Medium: Steam, hot oil, or thermic fluid
Operating Pressure: From vacuum conditions up to 10 bar (as per design)
Operating Temperature: Up to 200°C (based on material and process fluid)
Evaporation Capacity: 50 LPH to 50,000 LPH (customized as per industry need)
Liquid Feed: Low-viscosity and moderately foaming liquids
Vapor Separator: High-efficiency design for clean product separation
Mounting Type: Skid-mounted or stand-alone units
Utilities Required: Steam, cooling water/condensers, vacuum pump (if under vacuum operation)
Cleaning Method: CIP (Clean-in-Place) or manual cleaning options available

The liquid feed enters a Rising Film Evaporator from the bottom of vertical tubes. The liquid begins to boil when heat is applied to the tube walls, and the resulting vapor pushes the liquid upward. As a result of this action, a thin layer of liquid forms along the inner tube’s walls, ensuring effective heat transfer and high surface area contact. This evaporator is ideal for delicate items like juices, milk, pharmaceuticals, and herbal extracts due to the short residence time and reduced risk of thermal degradation.

Food & Dairy Industry – milk concentration, fruit juice processing, sugar solutions.
Herbal/active ingredient extraction and concentration in pharmaceuticals.
Chemical Industry – solvent recovery, acid concentration, polymer processing.
Herbal & Natural Extracts – concentration of flavors, aromas, and essential oils.

Processing delicate goods with care without sacrificing quality.
High heat transfer efficiency with reduced energy usage.
Compact design with continuous operation.
Simple upkeep and a long service life.
Design that can be scaled to fit both large and small businesses.

Conclusion

For industries that require gentle but efficient evaporation, the Rising Film Evaporator is a robust and energy-efficient option. Harsha Engineers offers systems that guarantee maximum productivity, product safety, and long-term performance with advanced engineering, durable construction, and customizable options.