Evaporators are used for concentration of liquids. In most of the cases evaporators are used to increase the solid contents of the liquid product prior to drying. Thin Film and Wiped Film evaporators are used to separate a mixture of liquids having different boiling points. It is also used to increase the concentration of liquids.
What is an Agitated thin film evaporator?
A very effective separation tool for liquid distillation or concentration is an agitated thin-film evaporator.
Its construction includes a rotor that forms a thin layer of the liquid being processed and a cylindrical evaporator body with a heated jacket.
The rotor stirs the liquid as it passes over the heated surface, guaranteeing uniform dispersion and averting clogging.
Using the right arrangement of blades, the liquid feed is spread out on the heated evaporator wall to create a consistent thin layer. Higher boiling point components flow down the wall and gather at the bottom, while volatile or lower boiling point components evaporate and are vacuumed out of the evaporator.
The vapors are separated and collected after passing through a condenser.
How does an Agitated thin film evaporator work?
Compared to other types of evaporators, Agitated thin film evaporator require less surface area and heat input because of their rapid and efficient heat transfer. A wide variety of heat-sensitive, high-boiling, and viscous feeds can be handled by thin-film evaporator because of their high vacuum distillation and short residence times.
The horse power requirements are quite low because of the low rotor speeds, which are between 100 and 150 rpm.
Short path distillation can be achieved by providing internal condensers to lessen the pressure drop between the evaporator and condenser.
Operating pressures up to O.1torr can be handled by the thin film evaporators, which are made to handle a variety of materials. In these evaporators, liquids with viscosities greater than 2,000 CPS can be handled.
Some advantages of using an agitated thin film evaporator?
Agitated thin-film evaporators are a popular option in many applications due to their many benefits.
Above all, their high heat transfer efficiency results in faster evaporation rates and reduced energy consumption compared to other types of evaporators.
The consistent dispersion of heat ensured by the agitated film reduces the possibility of localized overheating and the thermal degradation of materials that are sensitive to heat.
It is also appropriate for processing temperature-sensitive chemicals because of the short residence time in the evaporator, which minimizes thermal stress on the liquid.
Continuous operation is made possible by the continuous feed and discharge capabilities, which boost throughput and productivity.
Additionally, the small footprint of agitated thin-film evaporators conserves floor space and makes integration with current processing systems simple.
Construction of Agitated Thin Film Evaporator
The Agitated Thin Film Evaporator consists of a jacketed shell having a machined surface on the inner side.
The rotor assembly consisting of different configuration of blades depending upon the nature of product is mounted in the shell. Feed inlet is provided at the top side. Specially designed feed distributor is integral with the rotor at the top side.
The rotor is also fitted with an entrainment separator. Generally the vapour outlet is provided on the top side of the shell.
RAJ process provides a highly efficient and effective method for the evaporation of heat-sensitive materials, ensuring high product quality and minimal thermal degradation. RAJ process presents a reliable and innovative solution for industries seeking efficient and precise evaporation processes, leading to higher yields, cost savings, and enhanced product quality.
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