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Evaporation is the process by which a liquid turns into a gas. It is also one of the three main steps in the global water cycle.

Evaporation, process by which an element or compound transitions from its liquid state to its gaseous state below the temperature at which it boils; in particular, the process by which liquid water enters the atmosphere as water vapour in the water cycle.

Study the evaporation process of water from earth's surface into the sky where water vapour forms clouds

Evaporation happens when the liquid turns into a gas. The process begins when the molecules of the liquid get energy in the form of heat. They then turn into a vapors after this gaining of energy.

One more important thing to understand is that this process happens only on the surface of the liquid and not throughout the whole body or volume. During evaporation, the pressure of the surrounding atmosphere is higher than that of the vapor. On the contrary, condensation is the opposite of this process.

  • Multiple-Effect Evaporators
  • Falling Film Evaporators
  • Vapor Compression Evaporators
  • Crystallizers
  • Vacuum Flash Coolers
  • Evaporation System Components

Multiple-Effect Evaporators

Introduction: Multiple Effect Evaporator (MEE) is a system used widely for many applications in industries to achieve evaporation and obtain desired concentration as output by using an efficient amount of heat source.

Multiple-Effect Evaporators

Concept: A Multiple Effect Evaporator (MEE) is equipment uses efficient heating source either steam, Hot Water or Thermic Fluid to evaporate water. In Evaporation system, water is boiled in a single vessel using the heat source which results in the concentrate outlet and also the vapours generated from the boiled water.

Whereas in multiple-effect evaporator the equipment consists of a sequence of vessels, The heat source is given only at the first effect and the feed/water is also fed to the first effect, when the feed gets boiled it produces the vapours these vapours are used as the heat source to the next effect which results in effective usage of heat source. The concentrate from the first effect is fed to the next effect to achieve further evaporation. The pressure in each effect is lower than the last due to which the boiling point of water decreases as pressure decreases.

The important consideration in the industry is the economy of the system. Here, Kg of the liquid evaporated per Kilogram of steam is used. Hence the Multiple Effect evaporator achieves the desired concentration with less consumption of the heat source.

Multiple-effect evaporators maximize steam economy as vapor generated from one effect is used to drive another. This type of multiple-effect system is perfect for continuous feed applications, as fluids are progressively reduced in each effect to final concentration discharge. The evaporator design, based on Proven technologies, is ideal for multiple-effect systems, as each effect can be optimized for both vapor and fluid functional conditions to achieve optimum evaporation. This ability, together with our complete system design, allows us to lead the market for efficiency and reliability.

  • Ability to maximize usage of input energy (steam economy)
  • Reduced energy required to run full system
  • Reduced condensing load with additional effects (less cooling water needed)
  • Liquor flow control
  • Convenient foul condensate collection and processing
  • Ability to do online cleaning of individual effects
  • Maximum thermal efficiency with concurrent flow option

The proven, technologies falling film evaporators offer major advantages over other technologies in the market, such as:

  1. Optimal filming – It offers a constant liquor redistributive feature, which ensures consistent film quality across heating surfaces.
  2. Accessible heating surfaces – Our parallel bodies design allows for convenient viewing of all surfaces for inspection and cleaning.
  3. Full steam control – Our flexible plate design allows us to optimize every effect in every system, this is achieved thorough geometry control to ensure optimal vapor velocities and pressure drops.
  4. Flexible System Arrangements – It gives us the ability to produce virtually various sizes design within limited footprints or heights.


Multiple Effect Evaporators are widely used in the following areas as per the requirement.

  1. Effluent Treatment: Industries like Chemical, Pharmaceutical, Textile, Dyeing, Breweries, Automobiles, Milk, Food industries etc, generates process effluents which are harmful to the environment. These effluents generally consist of water in huge amount and waste(contaminants). By evaporating the water from the effluent using MEE system results in the recycling of water.
  2. Desalination: Reject of RO (Reverse Osmosis) have a huge amount of water. With MEE the water can be recycled.
  3. Chemical Industry / Pharma Industry: For the production of product the desired concentration is required or desired material need to be separated. Using MEE system desired concentration is achieved.
  4. Milk Industry:Milk can be concentrated in the MEE system.
  5. Sugar Industry:Sugar cane juice can be concentrated with MEE system.
  6. Food industries:Tomato juice concentration, Sausages, Fruit juice concentration can be done in MEE system.

Advantages: Evaporation can be achieved with low consumption of heat source.

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