What are the different types of evaporators?

  • Rotary Evaporator
  • Falling-film evaporator
  • Rising Film Evaporator – Long-tube vertical evaporator
  • Single effect external circulation evaporator
  • Thin Effect Evaporator
  • Open kettle or pan
  • Forced-circulation evaporator
  • Agitated film evaporator
  • Open pan solar evaporator
  • Horizontal-tube natural circulation evaporator
  • Vertical-tube natural circulation evaporator

How an Evaporator Works?

The working principle of the evaporator is to use the method of evaporation to vaporize and remove part of the solvent after heating the solution, thereby increasing the concentration of the solution, that is, the process of concentration of the solution. The equipment that performs the evaporation operation is called an evaporator. The basic parts of an evaporator usually consists of a heat exchanger, a vacuum pump, a vapor separator and a condenser.

What is difference between evaporator and condenser?


Evaporator absorbs heat; condenser discharges heat


The evaporator is mainly composed of a heating chamber and an evaporation chamber. The heating chamber provides the liquid with the heat required for evaporation, so that the liquid is boiled and vaporized; the evaporation chamber is the part that separates the gas and the liquid.

The condenser is a component of the refrigeration system; it is also a component of the entire evaporator system.


The evaporator uses the principle of heating to heat the solution containing different substances to boiling, so that part of the solvent is vaporized and removed.

The condenser is mainly used to discharge heat, it can convert gas or vapor into liquid. During the evaporation process, the device that converts the vapor into a liquid state is called a condenser.

Rotary Evaporator

A rotary evaporator, also known as rotovap, is a common and esential equipment for concentration, crystalization, drying, separation andsolvent recovery in pharmaceutical, chemical and bio-pharmaceutical fields and other fields.
A rotary evaporator usualy consists of several parts, including a motor unit, a vacuum system, a water or oil bath for heating, a rotating flask, areceiving flask, condenser pipes and other components.
The basic working process can be described below. The rotating flask is heated thermostatically and can rotate at a constant speed. Then thematerial forms a large area of thin flm on the inner surface of the flask. The solvent vapor is recycled in the colecting bottle ater being cooled byhigh-efficiency glass condenser, which greatly improves the evaporation efficiency.
A rotary evaporator is especially suitable for the concentration and purification of biological products which are easy to decompose and denatureat high temperature. lt features better security, higher evaporation efficiency, and more convenient operation.

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Falling Film Evaporator

A falling film evaporator is an esential evaporation equipment which is applicable for the evaporation and concentration of the foaming material
A falling film evaporator system mainly consists of several parts. The first part is the evaporator (the heat exchanger), which is used to heat andevaporate liquid materials. The second part is the separator, mainly used to separate the concentrated liquid and the secondary steam generatedafter heating. The third part is the preheater, which is used to preeat liquid materials entering the steam and cool the secondary steam in orderto recycle and utlize it. The fourth part is the condenser, whose function is to condense the secondary steam so that it can be recycled andutilized. The fifth part is the condensate tank, which is connected to the pump at the outlet and capable of discharging condensate liquidautomatically.
As the high efficient evaporation equipment, t’ s widely used in a great number of fields, such as the pharmaceutical, food, chemical, light fieldsand other fields for the evaporation and concentration of water and oraanic solvents. And it’s especially suitable for the evaporation andconcentration of thermal sensitive materials.
it can operate continuously under the conditions of vacuum and low temperature, featuring the high evaporation eficiency, energy conservationand low operating cost. As well, materials can be ensured not to change easily during the evaporation.

Rising Film Evaporator - Long-tube Vertical Evaporator

Rising film evaporator is also know as vertical long tube evaporator, rising tube evaporator.
Rising film evaporators are suitable for dilute solutions with low concentration and heat-sensitive materials.
The solution is preheated to the boiling point,added from the bottom of the heating chamber and strongly vaporized in the heating tube. Thegenerated vapor drives the iquid to rise n the form of a film along the pipe wal. The liquid flm continues to evaporate as it rises, The solutioncan reach the required concentration through the heating tube.

Single Effect External Circulation Evaporator

The single-effect external circulation evaporator completes most of the gas-liquid separation in the separation chamber
The single-effect extermal circulation evaporator is a device that uses negative pressure to heat the material to make the material liquid boilemove the vaporized part, and concentrate the material iquid. The equipment has a wide range of applications in many fields such asbiopharmaceuticals, health foods, daily chemicals, flavors and fragrances.

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