I have a question regarding the nitrogen stripping tower
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In gas lift, nitrogen is introduced into materials A and B to maintain a constant total pressure (vacuum extraction is required to keep the total pressure constant), thereby reducing the partial pressures of A and B; subsequently, the liquid phase diffuses into the gas phase. Then, by using vacuum to reduce the partial pressure of AB, can’t I also cause the liquid phase of AB to diffuse into the gas phase? What is the purpose of introducing nitrogen then?
It’s best to use a simple diagram when discussing such issues; it’s easier to understand things when looking at a picture. Is it about design? Or learning the principles of the process?
This post was last edited by bfdlwolf on 2020-7-14 at 10:43. Stripping is a physical process that uses a gas medium to disrupt the original gas-liquid equilibrium and establish a new one, thereby causing a certain component in the solution to be desorbed due to the decrease in partial pressure, and thus achieving the purpose of separating substances. For example, A is a liquid and B is a gas; B dissolves in A to reach a gas-liquid equilibrium, with the gas phase being dominated by B. When a stripping agent C is added to the gas phase, the partial pressures of both A and B in the gas phase decrease, thereby disrupting the gas-liquid equilibrium. Both A and B diffuse into the gas phase, but since B dominates the gas phase, a new equilibrium is established, resulting in a large amount of B diffusing into the gas phase and thus achieving gas-liquid separation. The degree of stripping can be controlled by adjusting the amount of the stripping medium.
The use of a nitrogen stripping tower enables multi-stage counter-current contact, resulting in a strong mass transfer drive for the removal of dissolved light components, and thus a more thorough removal effect. This effect cannot be achieved merely by reducing pressure without an inert gas to carry away the light components.
Got it, thank you. In other words, nitrogen acts in a way similar to bubbles, not only by reducing the partial pressure