Characteristics Of Pervaporation And Distillation

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According to Ahmad S.A. and Lone S.R. “Hybrid Process (Pervaporation-Distillation)”, Distillation is a separation technique, in which a feed mixture of different components is separated into two or more reaction products by collecting the overhead distillate, formed as vapor or a mix of vapor and liquid, and keeping the remaining liquid solution in the reaction container. To achieve this: firstly, the feed has to contain a liquid or a mix of vapor-liquid mixture at the start of the reaction. Secondly, These different components in the feed mixture require to have different volatilities, so they will separate in gas phases when the temperature has reached their boiling points. All in all, distillation is achieved by vaporization and condensation …show more content…
Naturally, PV display the following characteristics:
1. PV can also be used for the removal of certain components in equilibrium reactions.
2. Polymer membrane compaction, a frequent problem in high-pressure gas separation, is not encountered in pervaporation because the feed pressure is typically low.[8]
3. The permeate pressure has to be always lower than the saturation pressure of the permeant to achieve separation.[9]
4. Desorption of the component at the permeate side of the membrane. [10]
2.3 Operating Principles of distillation:
The basic principle of distillation is to bring a liquid into close contact with vapour so that the mass transfer between the two current phases can take place. The goal of each system to reach a state of equilibrium is based on the driving force for the mass transfer.[11]
When the vapour pressure matches the surrounding pressure that’s when a liquid begins to boil. The principle on which a liquid boils depends on its volatility. Liquids with high vapour pressures will boil at lower temperatures. Distillation is accomplished because of the differences in the volatility of the components in a liquid

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