Operation of the alkylation light-end removal tower
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I’m a newcomer to this field; could anyone kind enough explain why it’s possible to remove some of the moisture from the raw materials using a degassing tower, and why a reflux tank can also help remove some of that moisture? At the operating temperature and pressure of the light-end stripping tower, the boiling point of water should not be reached, so that the water can be vaporized. ? ?
The water content is minimal, resulting in a water-in-oil phenomenon! In other words, the water is carried to the top of the tower along with the material! The so-called azeotrope! In the recirculation tank, due to slow flow, water settles and accumulates, so it can be removed!
The output from the light-end stripping tower contains very little moisture; the vast majority of it goes upward. At a temperature of 102 degrees, the light-component gas coming from the bottom of the tower causes some of the water vapor in the liquefied gas to vaporize and be carried to the top of the tower where it condenses. This process repeats itself multiple times. In my opinion, it works on the same principle as the cyclic isobutane containing moisture that comes out of the isobutane stripping tower. However, in my opinion, the discharge from the light-end tower is the discharge from the bottom of the tower
This probably has little to do with the amount of processing
I asked our manager, and he told me that this water is internal water; I didn’t understand what that meant, which is why I turned to fellow users for help!
The bottom temperature is 102; it shouldn’t meet the conditions for surface water to vaporize
The bottom temperature is 102; it shouldn’t meet the conditions for surface water to vaporize
Isn’t this similar to the principle used when cooking: adding water, which vaporizes quickly and thereby pulls the oil that hasn’t reached boiling point along with it, which is why grease accumulates in the range hood? Hahaha
Internal water is what I mean by oil-in-water! The water is present in trace amounts and exists in molecular form within the material. As the material forms a gas-liquid phase inside the tower, the water, along with the lighter components, moves upward and vaporizes at the top of the tower! In the reflux tank, there is usually a baffle at the bottom; material is fed in at one end of the tank and discharged from the other, allowing sufficient time for sedimentation so that as much water as possible can be removed!
What’s the pressure? ? ? At this point, the boiling point of water cannot be taken into consideration; the amount of water is minimal, and it is carried upward by your light-component materials!