Regarding the stripping tower
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Hello everyone! While browsing the forum, I came across a post discussing stripping towers. My understanding of stripping towers might be incorrect, which made things more confusing as I read it; therefore, I’m here to ask for advice: People say that a stripping tower uses an inert gas to reduce the vapor pressure of solutes in the liquid phase, thereby removing those solutes. Device for recycling solvents. I used to think that a distillation column in which there is no condenser at the top, the feed is introduced directly at the top of the column, and the volatile components are removed from the top in gaseous form – such a special type of distillation column is called a stripping column. I’m so confused now; I don’t know what a stripping tower actually is What are the special requirements for the feed and discharge of a stripping tower, as well as for the structure of the tower? Also, in distillation units, sometimes towers without condensers are used for solvent recovery (I used to call them stripping towers). Why? That is, in what situations would a tower without a condenser be used? I hope fellow sailors will kindly offer their advice so that I can figure out all these issues! Thank you all! This post was last edited by huazig on 2009-3-12 11:24.]
Concept Blowing and stripping methods are used to remove dissolved gases and certain volatile substances from water. Gas (carrier gas) is introduced into water to ensure thorough contact between them, allowing the gases and volatile substances dissolved in the water to pass through the gas-liquid interface and transfer into the gas phase, thereby achieving the removal of pollutants. Air or water vapor is commonly used as the carrier gas; the former is known as stripping, while the latter is known as gas lifting. Principle The basic principle of stripping is gas-liquid phase equilibrium and mass transfer rate theory. For dilute solutions, at a constant temperature, when phase equilibrium is reached between the gas and liquid phases, the partial pressure of the dissolved gas in the gas phase is proportional to its concentration in the liquid phase – this is Henry’s law. P=Ex, where P is the equilibrium partial pressure of the solute gas in the gas phase, in Pa ； x —— equilibrium concentration of the solute gas in the liquid phase, molar fraction ； E — proportionality constant, known as the Henry’s law constant, in Pa.
I would like to ask Meng Fanyun: Can a distillation column that does not use a condenser, as those used in distillation units, also be called a stripping tower? In what situations is this type of tower generally used? Thank you
Generally, for ordinary distillation columns, the section above the feed tray is used; that is, columns that consist only of a distillation section without a stripping section are also considered air-stripped columns. However, the question raised is about how reflux, heat exchange, and purification can take place in a distillation column without a condenser. . .
The gas tower should be filled with an inert gas; generally, water vapor is used in such towers. There are two functions of this: 1. To reduce the partial pressure of the gases inside the tower, and 2. To provide heat.
Agree with the comment above. The company has stripping towers; some equipment can be recognized just by seeing them – theory comes from practice