FAQ

A thin-film evaporator spreads a fluid into a thin, turbulent layer across a heated surface using high-speed rotating blades. This results in excellent heat transfer and rapid evaporation. Because the film is continuously renewed, materials spend very little time on the heated surface, which protects heat-sensitive compounds and improves product quality.

Unlike conventional distillation or kettle boiling, thin-film evaporation uses a continuously refreshed, ultra-thin liquid layer that evaporates quickly and uniformly. Short residence times, vacuum operation, and efficient heat transfer minimize thermal degradation and provide higher purity and higher yields. The self-cleaning motion of the wipers also reduces fouling and extends operating time between cleanings.

Thin-film evaporators reduce thermal exposure by maintaining very short residence times and allowing operation under vacuum. These conditions lower boiling temperatures and prevent degradation. As a result, pharmaceuticals, natural extracts, specialty chemicals, and other heat-sensitive materials maintain stability, color, potency, and overall quality.

Vertical evaporators rely on gravity-assisted flow and can work well for partial evaporation of lower-viscosity materials. Horizontal evaporators, like Artisan’s ROTOTHERM®, maintain a uniform wetting of the process material along entire length of the evaporator’s inside wall, that is largely independently of the throughput rate and evaporation rate. Because of this, horizontal evaporators provide better residence-time control, turn-down capability, and minimize the potential for dry spots or fouling. This makes horizontal evaporators preferred for high-viscosity products, slurries, and applications that require maximum recovery. Horizontal units are also effective at producing dry powders for many materials, and are easier to clean and have a lower cost of ownership as compared to vertical units.

Horizontal evaporators are preferred when processing viscous materials, slurries, materials prone to fouling, or for drying to powder. They also excel when maximizing yield is critical, high turn-down capability is desired, or when precise residence-time control is required. Their configuration enables more uniform film formation and more robust processing of challenging materials.

Short-path distillation is a specialized form of thin-film evaporation that incorporates an internal condenser positioned only a few centimeters from the heated evaporation surface. This effectively eliminates the pressure drop the vapor and allows for operation at very deep vacuum levels in the sub-millibar range, for evaporating high-molecular weight materials.

Continuous evaporation provides steady-state operation, consistent product quality, reduced energy consumption, and reduced equipment cost and footprint. It also minimizes downtime because cleaning cycles are less frequent. Unlike batch processing, continuous systems deliver more stable performance and allow tight control over evaporation rate, temperature, and product quality.

The rotating blades continuously keep the process material turbulent along the heated surface, and the material is continuously being rapidly replaced by the incoming feed.  This minimizes the potential for buildup and fouling, allowing for longer production runs, lower cleaning frequency, and helps maintain consistent heat transfer efficiency over time.

Yes. Thin-film systems excel in solvent recovery applications because they enable rapid evaporation with minimal thermal exposure. Users can recover valuable solvents and concentrate products efficiently, lowering processing costs and reducing environmental impact.

1. Thin-film evaporators are highly versatile and can handle:
   1. Heat-sensitive compounds
   2. High-viscosity materials
   3. Slurries and suspensions
   4. Materials with high boiling points
2. They are commonly used in fine/specialty chemicals, pharmaceuticals, oils, foods & beverages, cosmetics, polymers, and renewable energy sectors.

Pilot testing allows us and our customers to evaluate how their specific materials will behave in a ROTOTHERM® thin-film evaporator. Artisan provides detailed performance data, optimization guidance, and scale-up recommendations. This reduces risk, validates feasibility, and helps customers determine the ideal process parameters before investing in full-scale equipment.

Customers typically provide material safety data, physical properties, feed material composition, desired purity or concentration, and any known degradation behavior. This information helps Artisan engineers design the most effective test plan.

Artisan’s systems are engineered for reliable scalability, and our engineers are well- on our tried-and-true internal scale-up methods. Parameters such as operating temperature, operating pressure, heat transfer performance, and rotor blade speed are directly transferable from pilot to production units, ensuring consistent performance at larger volumes.

Artisan’s ROTOTHERM®, Evaporator/Stripper^TM, Short Path Stripper thin-film systems are designed for seamless, reliable scale-up. Data collected during pilot testing can be translated directly into commercial operation, allowing predictable performance as production capacity increases.

The ROTOTHERM® MINI can operate between –40°C and 204°C, at pressures from 1 to 760 torr, with rotor speeds up to 3000 RPM. These wide operating ranges support a large variety of evaporation, drying, and purification processes.

Yes. Artisan’s ROTOTHERM® horizontal thin-film evaporators are engineered to process viscous feeds, slurries, and solids-containing mixtures. Their robust design prevents fouling and maintains efficient heat transfer even with very challenging materials.

Industries include pharmaceuticals, food and beverage, fine and specialty chemicals, polymers, edible oils, cosmetics, renewable energy, and R&D laboratories. Thin-film technology is valued wherever purity, product quality, thermal sensitivity, and the benefits of continuous processing are critical.

Yes. Artisan designs and manufactures equipment with pharmaceutical-grade materials of construction and documentation requirements. Systems can be configured to support cGMP operations, validation needs, and strict hygiene and cleanability standards.

Absolutely. Thin-film evaporation is widely used for botanical extracts, food concentrates, oils, flavors, polymers, specialty additives, and bio-based feedstocks. Its gentle processing preserves quality and improves yield across diverse industries.

Lead times vary by system size and customization level but typically range from several weeks to several months. Pilot testing results and process requirements can also guide manufacturing timelines.

Yes. Artisan offers full installation support and on-site or remote operator training. The goal is to ensure customers understand operation, maintenance, and best practices for maximizing performance.

Artisan provides continued engineering support, spare parts availability, troubleshooting assistance, and process optimization guidance. Long-term customer success is a key priority.