Evaporative equipment
We offer three types of evaporation systems: rotary evaporators, nitrogen evaporators, and freeze dryers.
Rotary evaporators are suitable for processing routine, large-volume solutions;
Nitrogen evaporators are ideal for small-volume, high-throughput sample processing;
Freeze dryers are used when maximum preservation of heat-sensitive and bioactive compounds is required.
The motor drives the distillation flask to rotate continuously. This rotation eliminates the need for boiling chips and prevents bumping. At the same time, the rotating motion spreads the liquid along the inner wall of the flask, forming a thin liquid film. This significantly increases the evaporation surface area and accelerates the evaporation rate.
Vacuum System
The vacuum system determines the degree to which the boiling point can be reduced, directly affecting the efficiency and safety of distilling heat-sensitive substances. The lower the ultimate pressure, the wider the range of solvent boiling points that can be handled.
For common low- to medium-boiling solvents (such as water, ethanol, and acetone), a vacuum level of 0.095 MPa is generally sufficient.
For high-boiling solvents (such as DMF and DMSO) or extremely temperature-sensitive compounds, a higher vacuum level (e.g. 0.098 MPa or higher) is recommended. This enables faster evaporation at lower temperatures and helps minimize thermal degradation.
Condensing System
A larger condenser surface area (e.g. 1500 cm²) provides better performance for handling high evaporation rates or low-boiling solvents.
Double-layer coil condenser: Composed of two concentric coiled glass tubes, forming a single annular cooling-water jacket.
Triple-layer coil condenser: Composed of three concentric coiled glass tubes, forming two coaxial annular cooling-water jackets.
Switchable single- and double-tube condensers: Offer a wider range of applications and greater flexibility.
Temperature Control System
Water bath: General-purpose, suitable for temperatures up to 95 °C.
Oil bath: Recommended for processing high-boiling solvents (>100 °C) or when higher operating temperatures are required.
Temperature control accuracy: ±1 °C.
A nitrogen evaporator uses a stream of inert gas (typically nitrogen) directed over the surface of the sample to disrupt the vapor–liquid equilibrium at the liquid surface. Combined with heating from a water bath or dry bath, it enables localized and directional acceleration of solvent evaporation, achieving rapid concentration or volume reduction.
Liquid handling: Compatible with test tubes of different heights and specifications
Classification (by scale and sample capacity)
Benchtop freeze dryers
Vertical freeze dryers
Large-scale freeze dryers
Benchtop freeze dryers
Vertical freeze dryers
Large-scale freeze dryers
Functions of Nitrogen Gas
Accelerates solvent evaporation and improves concentration efficiency
Displaces oxygen, enabling “oxygen-free concentration”
Freeze-Drying Temperature
Conventional samples: −50 °C to −55 °C meets most application requirements
Heat-sensitive biological samples: ≤ −65 °C is recommended to better preserve biological activity
Vacuum Level
The freeze dryers we provide achieve a vacuum level of ≤ 10 Pa
Some models offer an ultimate vacuum of ≤ 1.33 Pa
