What is the purpose of stopping hot hydrogen flow to carry oil?

Release the dissolved hydrogen in the oil as well as that in the reactor and pipelines! Prevent hydrogen embrittlement and hydrogen corrosion

1. Remove all the oil from the catalyst to prevent coking as the catalyst heats up during operation. 2. At high temperatures, release the hydrogen that has entered the pipelines to avoid hydrogen embrittlement

The oil in the reaction system cannot be purged; it can only be gradually carried to high pressure using hydrogen

Remove the oil from the reactor or pipes to prevent oil buildup in them, and also allow the hydrogen drawn into the reactor to be diluted gradually, thereby preventing hydrogen embrittlement

The purpose is to remove the residual oil remaining on the catalyst in the reactor

The oil can be completely removed in the hot state, thereby reducing the time required for replacement and maintenance； No liquid slugging will occur when the machine is started.

Its main function is to use hydrogen to remove the oil present in the system. The process of removing hydrogen mentioned above is an operation that needs to be carried out after hydrogen carries the oil away

You must be referring to isothermal hydrogen evolution! ?

Hot hydrogen oil transfer, as the name implies, involves transporting the oil from the reaction system to higher pressure levels in order to prepare for maintenance work after shutdown. After this process is completed, 16 hours of constant-temperature dehydrogenation are required to release the hydrogen that has penetrated into the reactor walls and pipelines.

It mainly prevents pipelines from getting blocked after the wax oil cools down

It’s about sweeping the oil out of the reactor. If there is wax oil, sweep more thoroughly

The purpose of hot hydrogen is! Protect the catalyst! Because after the catalyst has been used for a certain period of time! There is a small amount of coking in the catalyst! Carbon buildup! During the shutdown! This will accumulate on the surface of the catalyst over time! It shortens the catalyst lifespan! So when work stops! Use light oil to remove the coking on the catalyst! Carbon buildup! Heavy oil displacement! After the displacement is successful, high-temperature hot hydrogen is needed to remove the oil products! Protect catalyst life! It can improve catalyst activity to a certain extent!

Why high temperature? Can’t nitrogen be used? There’s also the risk of reduction by hydrogen and catalysts

Remove the oil from the catalyst to prevent hydrogen embrittlement in the pipelines

1. Remove all the oil from within the pipeline and the reactor catalyst. 2. The hydrogen dissolved in the reactor wall is slowly released.

In order to remove the residual oil remaining on the catalyst in the reactor

This post was last edited by Mangaa Mang on 2018-12-27 09:10. Function 1: To clean the oil from the pipelines and equipment in the reaction system. II: To fully release the oil that has entered the pores of the catalyst in the reactor, this facilitates the protection of the catalyst during shutdown for maintenance ； If the catalyst needs to be unloaded during shutdown for maintenance, safety is ensured both in terms of ensuring that there is no oil inside the catalyst at the time of unloading and in terms of the safety procedures for unloading. As for why hot hydrogen is used to carry the oil, it is because hydrogen allows for the use of the largest possible amount of gas, which results in a cleaner process. The higher temperature is necessary because oils have viscosity; the lower the temperature, the greater the viscosity and the worse the flow conditions, which hinders the effective removal of oil. On the other hand, if the temperature is too high, reactions may occur, and since hydrogenation reactions are exothermic, there is a high risk of safety issues such as overheating. Therefore, to carry oil with hot hydrogen, the appropriate temperature and hydrogen flow rate for carrying oil must be selected.