What is the function of the deoxidation tower in a continuous reforming unit?
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I would like to ask everyone: What is the function of the naphtha deoxygenation tower in the raw material pretreatment section of continuous reforming? The gas that was removed?
Function: There is no issue with dissolved oxygen in naphtha transported through pipelines; however, naphtha in tank trucks and storage tanks comes into contact with oxygen. The naphtha that enters the facility contains a significant amount of dissolved oxygen. At high temperatures, this dissolved oxygen combines with the unstable hydrocarbons in the naphtha to form sediments, which leads to coking in the pre-hydrogenation system and an increase in pressure drop in the pre-hydrogenation reactors. When scaling and carbon deposition become severe, material flow can be disrupted, reducing the contact area with the catalyst and thereby decreasing the extent of hydrogenation, which affects product quality. Gases emitted: dissolved oxygen, unsaturated hydrocarbons, water vapor
Classic! Where is it? Previously, there was a process of fractional distillation first, followed by hydrogenation. First, C5 is removed, and then pre-hydrogenation takes place; this tower serves to remove oxygen. It is said that coking occurs less during pre-hydrogenation.
I won’t tell you where it is :lol
A similar process is applicable to many units in oil refining production; for example, the water used in the amine desulfurization process must be deoxygenated water, and furfural is refined to prevent the presence of oxygen. All raw materials coming from the storage tanks must pass through vacuum degassing towers. If purchased naphtha is used, such as from Dalian Fujia, the pre-hydrogenation heat exchangers have to be shut down for coking every six months. If it were the previous degassing tower, things might be better, but the gums already present in the postal items will still produce coke.
Jinling Branch, Aromatic Operations Department II, Reforming
Thank you for the reminder from above; I still have an introduction to this device
The reforming unit at Luoyang Design Institute also follows a process of deoxygenation followed by pre-hydrogenation; its main purpose is to remove dissolved oxygen, as well as certain light components and non-condensable gases. I have come across similar units before; some of them are called vaporizers, and I’m not sure if their function is the same as that of this unit
Hydrorefining doesn’t even have a deoxygenation tower – is pre-hydrogenation in reforming necessary?
I heard that the top of the deoxygenation tower at Dalian Fujia used to be prone to scaling. Does anyone know the specifics?