Is catalyst protection with nitrogen required after the hydrogenation unit is shut down?
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Is it necessary to use nitrogen protection for the catalyst in the reactor after the hydrogenation unit is shut down? If necessary, what are the requirements for the pressure of nitrogen? What pressure of nitrogen is required to protect the amine solution in the storage tank from oxidation?
The catalyst requires nitrogen protection to prevent air from entering and causing the ferrous sulfide to catch fire spontaneously.
Nitrogen protection is required to reduce the likelihood of the formation of hydrocarbon-oxygen compounds and iron sulfide. There are no strict requirements regarding pressure.
After the hydrogenation unit is shut down, the catalyst in the reactor needs to be protected with nitrogen; a pressure higher than atmospheric pressure is sufficient, as the main goal is to prevent air (oxygen) from entering the reactor. The principle for amine solutions is the same
It is best to use an inert gas for protection; this is beneficial for both the catalyst and the equipment, and it also facilitates startup. I’m not quite sure about the second question – what kind of amine?
To protect the catalyst, nitrogen shielding is necessary; only a positive pressure is required, with no special specifications
Nitrogen protection must be applied, with the nitrogen pressure not falling below atmospheric pressure.
After the hydrogenation unit is shut down, the catalyst in the reactor needs to be protected with nitrogen or dry ice to prevent the spontaneous combustion of ferrous sulfide. To prevent oxidation, the amine solution in the storage tank needs to be protected by nitrogen at a slight positive pressure.
1. Nitrogen protection is required; the catalyst can also be passivated, in which case gas protection is no longer necessary； 2. Amine solutions are highly susceptible to oxidation; therefore, the pressure of the protective gas should not be high – it is sufficient to have a pressure slightly higher than that of the atmospheric air (oxygen-containing gas).
Nitrogen protection is required to prevent oxygen from entering and causing spontaneous combustion of ferrous sulfide.
Protected under a slight positive nitrogen pressure
Inert gas shielding is necessary, mainly to prevent oxygen in the air from entering and causing the catalyst to catch fire. A slightly positive pressure is sufficient (above atmospheric pressure)~~~ When we carry out external regeneration, the transport bags are filled with a certain amount of nitrogen for protection.
It is necessary to use nitrogen for protection – firstly to safeguard the catalyst from the natural formation of ferrous sulfide, and secondly to prevent corrosion by polyoxysulfuric acids
Nitrogen protection is required; a slight positive pressure is sufficient. We usually use a pressure of 30 to 50 KPa. As for the amine tank, there must be a specified operating pressure as well!
After the hydrogenation unit is shut down, the catalyst in the reactor must be protected with nitrogen; generally, a slight positive pressure of 0.5 kilograms per square centimeter is sufficient.
The catalyst in the reactor must be protected with nitrogen to prevent system leaks; it is recommended to maintain a pressure of no less than 0.2 MPa. The amine solution, likewise, should be protected with nitrogen at a pressure of around 0.02 MPa
It can also be protected with hydrogen + H2S, for use during short-term shutdowns.
Generally, maintaining a slight positive pressure is sufficient; the main purpose is to prevent oxygen from entering the amine solution. The principle is the same. Our equipment’s lean liquid tank, rich liquid tank, raw oil tank, soft water tank, etc., are all equipped with proportional control systems to maintain a nitrogen pressure of 0.2 MPa as a protective measure. If the softened water cannot flow in, the pressure needs to be reduced; of course, a positive pressure must be maintained. To prevent amine-rich fluid from escaping, the pressure must be increased accordingly
Nitrogen protection is required; a slight positive pressure is sufficient. If there are two reactors, one needs to have its head removed while the other is protected.
Nitrogen protection is required to prevent oxygen from causing spontaneous combustion of ferrous sulfide, and the nitrogen pressure must not be lower than atmospheric pressure.
Nitrogen protection is required; a pressure higher than atmospheric pressure is sufficient, as this prevents air from entering the reactor and causing ferrous sulfide to form naturally! ! ! ! !