What is bubble entrainment? What are its disadvantages?

The liquid flows horizontally across the tray; after coming into contact with the gas, it flows down to the lower tray through the downcomer. When the liquid flows into the downcomer, it often contains a large number of bubbles. It stays in the downcomer long enough for the foam to separate into gas and clear liquid, with the gas rising back to the upper tray. If the liquid load increases, the flow velocity of the liquid in the downcomer rises and its residence time becomes very short; as a result, the bubbles entrained in the liquid do not have enough time to separate before being carried to the next tray. This phenomenon is known as \"bubble entrainment\". Severe bubble entrainment reduces the separation efficiency of the tray, so it is not allowed. The measure to prevent bubble entrainment is to control the reflux flow properly.

Bubble entrainment will cause an increase in the pressure drop across the entire column, resulting in a poorer separation of light and heavy components.

The liquid flows horizontally across the tray; after coming into contact with the gas, it flows down to the lower tray through the downcomer. When the liquid flows into the downcomer, it often contains a large number of bubbles. It stays in the downcomer long enough for the foam to separate into gas and clear liquid, with the gas rising back to the upper tray. If the liquid load increases, the flow velocity of the liquid in the downcomer rises and its residence time becomes very short; as a result, the bubbles entrained in the liquid do not have enough time to separate before being carried to the next tray. This phenomenon is known as \"bubble entrainment\". Severe bubble entrainment reduces the separation efficiency of the tray, so it is not allowed. The measure to prevent bubble entrainment is to control the reflux flow properly.

In simpler terms, the light components appear in bubble form and are carried by the flowing liquid phase through the downcomer to the lower trays of the tower

Check below, this question has been asked before! 【Daily Question】What is bubble entrainment, and what are its hazards? http://bbs.hcbbs.com/thread-1403737-1-1.html (Source: Haichuan Chemical Industry Forum) The liquid flows horizontally across the tray; after coming into contact with the gas, it flows down to the lower tray through the downcomer. When the liquid flows into the downcomer, it often contains a large number of bubbles. It stays in the downcomer long enough for the foam to separate into gas and clear liquid, with the gas rising back to the upper tray. If the liquid load increases, the flow velocity of the liquid in the downcomer rises and its residence time becomes very short; as a result, the bubbles entrained in the liquid do not have enough time to separate before being carried to the next tray. This phenomenon is known as \"bubble entrainment\". What are its disadvantages? Answer: Severe bubble entrainment also reduces the separation efficiency of the tray, so it is not allowed either. The main measure to prevent bubble entrainment is to control the reflux mother liquor.