Wiped Film Evaporators (WFE): Precision Technology for Demanding Petrochemical Applications
1. Technology and Operating Principle
The Wiped Film Evaporator (WFE) is a highly efficient, short-path thermal separator. Its core design comprises a heated cylindrical jacket and a precision-rotor equipped with multiple wiper blades. The heating medium—typically steam, thermal oil, or hot water—circulates through the jacket. The rotor-mounted blades maintain an extremely narrow, adjustable clearance (commonly between 0.5 to 1.5 mm) from the inner heated surface.
The process feed, after initial preheating, is introduced tangentially at the top of the evaporator body. Driven by gravity and the mechanical action of the fast-rotating wipers, the liquid instantly spreads into a thin, turbulent film across the entire heated wall. This film descends rapidly while undergoing intense, controlled evaporation. The residual concentrated liquid (the bottoms product) is discharged from the lower outlet, while the generated vapor (distillate) is efficiently separated and exits from the top section. This configuration allows for exceptionally gentle processing of sensitive, viscous, or fouling materials, and in specific operational modes, can be configured to produce a dry solid product directly at the discharge point.
2. Engineered Performance and Defining Features
Our Wiped Film Evaporator (WFE) incorporates an advanced centrifugal slotted-rotor system, a state-of-the-art design that ensures the formation of a uniform, thin film even with minimal feed rates. The aggressive mechanical action of the rotor continuously scours the heated surface, preventing fouling and scaling. Compared to traditional fixed-gap evaporators, this technology can increase evaporation rates by 40-69%. The core performance benefits are:
Minimal Pressure Drop: Engineered with an optimized, large-diameter vapor path, the internal pressure closely matches that of the external condenser. This results in an exceptionally low pressure drop (as low as 5 mmHg), ensuring stable vacuum operation and significantly reducing energy consumption.
Low-Temperature Processing: Operation under high vacuum drastically lowers the boiling point of materials. This allows for gentle evaporation at significantly reduced temperatures, making it ideal for heat-sensitive compounds and preventing thermal degradation.
Ultra-Short Residence Time: The combination of a thin film and positive mechanical wiping ensures material residence time on the heated surface is typically between 5 to 10 seconds. This brief thermal exposure is critical for preserving the integrity of unstable or reactive substances.
High Evaporation Intensity: The design maximizes the effective temperature gradient. The wiping action minimizes liquid film thickness and boundary layer resistance, leading to superior heat transfer coefficients and remarkably high evaporation capacities.
Exceptional Process Flexibility: The WFE handles an extremely wide range of viscosities—from solvents to heavy residues—and can seamlessly process materials whose viscosity increases dramatically during concentration. This versatility suits diverse and challenging feedstocks.
Reliable & Consistent Operation: It delivers stable, predictable performance despite variations in feed composition or concentration, providing reliable results for both heat-sensitive and viscous materials.
Compact & Service-Friendly Design: Its modular and space-efficient footprint saves valuable floor space. The simplified mechanical design allows for easier inspection, maintenance, and cleaning, ensuring higher uptime and operational continuity.
3. Detailed Operational Mechanism
Preheated feed material is introduced radially at the top of the heated zone. A specialized distributor ensures even radial dispersion onto the evaporator’s inner wall, preventing feed splash into the vapor stream and suppressing flash evaporation at the inlet to control foaming.
A high-speed rotor equipped with precision wiper blades instantly spreads the feed into a thin, turbulent film and propels it downward in a spiral path. This continuous wiping action renews the film surface, generates high turbulence, prevents fouling, and maximizes heat transfer efficiency.
The volatile components vaporize almost instantly. The vapor rises through an integrated, property-specific centrifugal droplet separator that removes entrained liquid, returning it to the process while allowing clean vapor to pass to the condenser. The concentrated product is discharged from the bottom outlet.
4. Ideal Industrial Applications
The synergy of these advantages positions the WFE as the optimal solution for high-value separation in demanding sectors:
Petrochemical & Refining: Concentration and purification of lubricating oils, recovery of solvents, deasphalting, and processing of temperature-sensitive intermediates.
Pharmaceutical & Fine Chemicals: Gentle concentration of active pharmaceutical ingredients (APIs), purification of heat-labile compounds, and solvent recovery under mild conditions.
Food & Flavors: Evaporation of sensitive extracts, fruit juices, and essence recovery while preserving aroma, color, and nutritional value.
Polymers & Resins: Devotilization of monomers, concentration of prepolymers, and purification of viscous adhesives or coatings.
Environmental Technology: Treatment of industrial wastewater for volume reduction, recovery of valuable materials from effluents, and hazardous waste concentration.
With its unmatched efficiency, gentle processing, and operational robustness, the Wiped Film Evaporator is a critical asset for advancing productivity and product quality in the most challenging industrial applications.
| Parameters | Type 1 | Type 2 | Type 3 | Type 4 | Type 5 | Type 6 | Type 7 |
| Trans surface (㎡) | 1 | 2 | 4 | 6 | 10 | 12 | 20 |
| Vapor pressure (Mpa) | 0.3 | ||||||
| Vacuum (Mpa) | -0.08 | ||||||
| Evaporating capacity (kg/h) | 100 | 200 | 300 | 600 | 1000 | 1200 | 2000 |
| Steam consumption (kg/h) | 110 | 220 | 330 | 660 | 1100 | 1300 | 2200 |
| B.H.P (kW) | 1.5 | 3 | 4 | 5.5 | 11 | 11 | 15 |
| Agitator speed (rpm) | 0-160 | 0-150 | 0-176 | 0-136 | 0-110 | 0-110 | 0-110 |
| Height (mm) | 3100 | 4800 | 5680 | 6410 | 7200 | 7800 | 9850 |
Why Select Our WFE?
Our Wiped Film Evaporators deliver unmatched efficiency for critical separation tasks in petrochemical, refining, and high-value solvent recovery applications. Engineered with precision, they maximize throughput, minimize thermal degradation, and significantly reduce operational costs.
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Short Path Distillation Systems: Precision Separation for Sensitive Materials
An Introduction to Short Path Distillation Technology
Short Path Distillation (SPD) systems represent the pinnacle of molecular separation technology, specifically engineered for the gentle and efficient purification of thermally unstable, high-boiling-point, or viscous compounds. By operating under an intense vacuum and minimizing the vapor travel path to mere centimeters, this advanced process drastically reduces both operating temperatures and residence time. Our state-of-the-art Short Path Evaporators deliver exceptional separation efficiency and product purity, making them indispensable in high-value industries where product integrity is paramount.
The Operating Principle of Short Path Distillation
The core of the SPD process involves the precise, thin-film evaporation of the feed material on a heated surface. Under a high vacuum, the material’s boiling point is significantly lowered. The volatile components vaporize instantly and travel an extremely short, direct path—typically within the same housing—to an internal condenser cooled by cryogenic fluids or chilled media. Here, they immediately re-condense. This minimal transit distance, combined with rapid condensation, virtually eliminates the risk of thermal decomposition or molecular rearrangement. The result is a highly efficient separation that preserves the molecular structure of even the most delicate substances, with the distillate (light fraction) and residue (heavy fraction) collected separately in a single, continuous operation.
Key Features and Technical Specifications
Deep Vacuum Capability: Engineered to achieve and sustain operating pressures as low as 0.001 mbar, dramatically lowering the boiling point of substances and enabling the gentle separation of high-molecular-weight materials.
Minimized Vapor Path: Features an integrated design where the evaporator and condenser are in close proximity, ensuring vapors travel only a centimeter-scale distance. This is critical for preventing thermal degradation and recombination of sensitive molecules.
Optimized Thermal Design: Incorporates high-efficiency heating surfaces and precision temperature control systems to ensure uniform, controllable heat transfer for consistent evaporation rates and product quality.
Modular & Compact Footprint: Designed with a space-efficient, modular architecture that allows for flexible integration into both pilot plants and full-scale production facilities.
Premium Construction Materials: Manufactured using 316L stainless steel, high-grade borosilicate glass, and specialized alloys to ensure exceptional resistance to corrosion, thermal stress, and chemical attack, guaranteeing durability and process purity.
Advantages of Our Short Path Distillation Systems
Superior Product Integrity: The combined effect of low-temperature operation and ultra-short residence time virtually eliminates thermal stress, preserving the molecular structure and bioactivity of heat-labile compounds.
Exceptional Purity & Yield: Achieves precise separations with high recovery rates, producing distillates of exceptional purity that meet stringent specifications for pharmaceuticals, nutraceuticals, and fine chemicals.
Operational Economy: Significant energy savings are realized due to low operating temperatures, while the efficient design reduces cycle times, boosting overall process productivity.
Broad Process Versatility: A single system can be configured for multiple unit operations, including molecular distillation, degassing, deodorization, and thin-film evaporation, across a vast range of viscosities and feedstocks.
Seamless Scalability: Our technology is scalable with precision, offering consistent performance from laboratory R&D units through to continuous industrial production systems, ensuring a reliable tech-transfer path.
Core Industry Applications
Pharmaceuticals & Biotechnology: Purification of Active Pharmaceutical Ingredients (APIs), synthetic intermediates, peptides, and lipids under GMP-compatible conditions.
Essential Oils & Aromatics: Concentration and refinement of delicate botanical extracts, terpenes, and fragrance compounds without loss of aromatic profile or therapeutic value.
Specialty Chemicals: Separation of high-boiling-point isomers, purification of monomers, recovery of precious catalysts, and devolatilization of polymers.
Food & Flavor Science: Gentle concentration of natural flavors, vitamins (A, E, etc.), and removal of pesticides or solvents from sensitive food-grade products.
Cannabinoid & Botanical Refining: Critical for producing high-purity, full-spectrum cannabinoid distillates and isolates while preserving the authentic terpene profile.
Why Partner With Us?
Process-Led Expertise: We combine deep technical knowledge with practical application experience to provide solutions that work in your real-world environment.
Uncompromising Quality: Every system is built to exacting standards and rigorously tested to ensure reliability, safety, and long-term performance.
Comprehensive Support: Our partnership includes dedicated process engineering support, thorough training, and responsive after-sales service for the entire lifecycle of your equipment.
Tailored Engineering Solutions: We specialize in designing and customizing systems to fit your specific feed material, target purity, throughput, and integration requirements.
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Ready to elevate your purification capabilities with industry-leading Short Path Distillation technology? Contact our engineering team today for a detailed consultation, application review, or a customized quotation. We are committed to helping you optimize product quality, yield, and process efficiency.
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Falling Film Evaporators: Engineered for High-Efficiency Concentration
Technology Overview
Falling Film Evaporators (FFE) represent a pinnacle of thermal efficiency and gentle processing, specifically designed for the continuous evaporation and concentration of heat-sensitive, viscous, or foaming liquids. By leveraging gravity-driven thin-film flow and precise temperature control, these systems achieve maximum evaporation rates with minimal thermal exposure. Our advanced FFE units are engineered for robustness, scalability, and consistent performance, making them the preferred solution for industries demanding high product quality and operational reliability.
Operational Principle
The core of the process begins with the uniform distribution of preheated feed liquid across the top of a bundle of vertical tubes. Through specially designed distributors, the liquid forms a thin, continuous film that descends solely under the influence of gravity along the heated inner walls of the tubes.
Heating media—such as steam or hot water—circulates on the shell side, transferring energy through the tube walls. This causes rapid evaporation of the volatile components directly from the thin, turbulent film. The concurrent downward flow of vapor and liquid significantly enhances heat transfer efficiency while maintaining a low temperature gradient.
The resulting vapor-liquid mixture is then separated in a centrifugal or tangential separator located at the base; concentrated product is discharged, while vapor proceeds to a condenser or the next effect in a multi-stage setup. This design ensures exceptionally short product residence time, high heat transfer coefficients, and gentle handling of delicate materials.
Key Features and Technical Specifications
Superior Thermal Performance: Engineered with precision-designed heat exchange tubes and advanced distribution systems to maximize heat transfer coefficients, ensuring rapid, uniform evaporation and optimal energy utilization.
Minimized Thermal Stress: The gravity-driven, thin-film flow results in extremely short product residence times (typically seconds), drastically reducing thermal exposure to preserve the quality of heat-labile compounds.
Broad Process Compatibility: Capable of efficiently processing a wide spectrum of feed materials, from low-viscosity solvents to highly viscous concentrates, with smooth handling of varying concentrations.
Modular Scalability: Built on a modular platform that allows for seamless and cost-effective scaling from pilot-scale trials to high-capacity industrial production lines without sacrificing process efficiency.
Robust Construction: Fabricated from high-grade corrosion-resistant materials including 316L stainless steel, duplex steels, and titanium to ensure longevity and purity when handling aggressive chemical or sanitary-grade applications.
Advantages of Our Falling Film Evaporators
Exceptional Energy Economy: High heat transfer efficiency translates directly into lower steam consumption and reduced utility costs, delivering a rapid return on investment.
Gentle Product Handling: The combination of low operating temperature differentials and brief contact time makes it the ideal choice for temperature-sensitive products, preserving organoleptic properties, nutritional value, and molecular integrity.
Unmatched Versatility: A proven solution across diverse sectors for duties including concentration, crystallization, stripping, and deodorization, offering significant process flexibility.
Continuous, High-Throughput Operation: Designed for stable, uninterrupted production, maximizing plant uptime and output while maintaining consistent product specifications.
Streamlined Maintenance: A logical layout and accessible design simplify inspection, cleaning (CIP/SIP capable), and component service, minimizing operational downtime.
Primary Industry Applications
Food & Beverage: Concentration of fruit juices, dairy products, sweeteners, and coffee extracts while retaining essential flavors, colors, and vitamins.
Pharmaceutical & Biotechnology: Gentle concentration of APIs, enzymes, fermentation broths, and herbal extracts under controlled, sanitary conditions.
Chemical Processing: Evaporation and recovery of solvents, concentration of inorganic salts, acids, and polymers, and purification of process streams.
Biofuels & Renewable Chemicals: Concentration of bioethanol, glycerin, and lignin streams to increase purity and reduce downstream processing costs.
Environmental & Waste Management: Volume reduction of industrial wastewater, brine concentration, and ZLD (Zero Liquid Discharge) systems for responsible discharge or resource recovery.
Why Select Our Technology?
Application-Focused Engineering: We combine decades of process expertise with advanced simulation tools to design systems optimized for your specific material and production goals.
Quality Without Compromise: Every unit is manufactured under a strict quality management system, with rigorous testing to guarantee performance, safety, and compliance with international standards.
True Partnership: We engage as an extension of your team, offering customized solutions, comprehensive process guarantees, and lifecycle support to ensure your long-term operational success.
Innovation-Driven Design: We incorporate the latest advancements in distribution technology, automation, and energy recovery to deliver systems that set benchmarks in efficiency and reliability.
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Elevate your concentration process with a Falling Film Evaporator designed for peak performance and reliability. Reach out to our engineering specialists today for a detailed consultation, process review, or a custom-engineered proposal tailored to your capacity and quality requirements.
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