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What are Evaporators?

11/8/2013 7:56:01 AM | by Anonymous


Evaporators are types of tool that are used to separate a single solvent from a mixture of other materials. These solutions or mixtures are usually broken down into pure compounds so that the evaporators are able to evaporate the unwanted solvents. Most of the times, evaporators are used to extract water from a mixture such as salt water. However, the evaporation process can also be used to extract the solid from the mixture as well. Evaporators are commonly used in the science industry, specifically the chemical and food production or testing industries.

Evaporators are able to convert solutions to become more concentrated or purified. Evaporators are also programmed to limit the volume of the finished product and to remove any impurities in the food production industry. This allows for the food products to be safer when it comes to consumption or storage. The costs of transport and the cost of processing these products are also indirectly cut down as the evaporators save weight and bulk by evaporating the liquids that exist in the product away.

The process of evaporation and drying may seem quite similar, but they are quite different. This is because after the evaporation process, there is still some liquids present in the product. Whereas drying completely removes all forms of liquid from the product. There are many different kinds of evaporators that can be used. For example, there is the air evaporator which uses heat and air to evaporate the liquid molecules to leave the mixture and enter the surrounding atmosphere. There is also the vacuum evaporator which uses forced liquid removal by simulating a highly pressurized environment that physically separates the solvent from the mixture. A refrigerator evaporator also uses the same method by using a process called crystallization.

One of the most common types of evaporators that are used widely in many industries is the falling film evaporator. These evaporators are used to evaporate substances that are sensitive the changing temperatures. Some applications of this particular evaporator are used in the chemical, food, pharmaceutical and dairy industries. In falling film evaporators, the mixture is put into heating tubes. These heating tubes apply hot temperatures to the mixture. After that, steam is applied to the surface to cool the mixture. This causes the concentrated liquid to condense. A separator is then used to separate the concentrate from the mixture.

Falling film evaporators are good as its design allows for liquid to flow at an even rate down the heating tubes. This means that the evaporation process will go very smoothly and all the concentrate is extracted from the mixture. However, if the falling film evaporators are not properly moist, something known as dry patches will form and disrupt the evaporation process.

In the milking industries, these falling film industries are used to produce skimmed milk or concentrated milk without damaging the quality of the milk. Vegetable and fruit juices also use evaporators to extract the juice concentrates; it is harder to evaporate these substances however. This is because the flavor of the juice may be lost after the evaporation process. The evaporation process also leaves behind small bits of the fruit that may get stuck on the heating tubes and disrupt the flow of the mixture. To counter this problem, the mixture is flowed at higher speeds so that the bits do not stick on the tubes.

The overall efficiency of any evaporators varies on factors such as the substance being evaporated. The thickness of the substance also plays an important part as if the liquid is too thick then it may solidify and clog up the tubes of an evaporator. Thus it is important to program and design the evaporator correctly so that it is able to accommodate the different type of mixtures going through it.

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