Pre-hydrogenation reaction temperature
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This post was last edited by fengdingwen on 2010-9-13 09:46. The semi-batch reforming pre-hydrogenation catalyst used in our company is FH-40C. The following are the design parameters: Reactor inlet temperature: 300–340°C; Reaction pressure (gauge): 4.0 MPa; Reaction space velocity (volume/hour): 6; Hydrogen-to-oil volume ratio: 150:1. The actual outlet temperature of the reactor is usually controlled at 290°C, with the bed temperature being 300°C at the inlet and up to 310°C at the outlet. Under these conditions, the differential pressure increases rapidly. Everyone could share their operating parameters for semi-continuous reforming pre-hydrogenation; let’s exchange ideas.
What raw materials? There’s probably coker gasoline. Dienes in coker gasoline can cause a rapid increase in bed pressure drop.
The pressure drop is generally not closely related to the operating conditions of the reactor. If the pressure difference increases rapidly, and this is due to a high content of olefins in the feedstock, it is possible to increase the hydrogen-to-oil ratio slightly in order to slow down the polymerization of olefins. If water is present in the feedstock, causing corrosion of the equipment, this can also lead to an increase in the reactor’s pressure drop; in such cases, it is necessary to strictly control the water content in the feedstock
Another possibility is solid particle impurities; in our facility, the use of vacuum distillation and atmospheric distillation processes along with coking residue oil results in a large amount of coke powder present in the crude oil, which really bothers us a lot……
You need to provide information on the raw materials used by your company in order to make a judgment!
Yes, it’s mainly a problem with the raw materials; the reaction conditions should be fine
If secondarily processed gasoline, such as coker gasoline, is blended in, dienes can easily cause an increase in pressure difference; meanwhile, coke powder from coking units can easily enter the system, which can also lead to an increase in the pressure difference across the bed layer!
Is no filter installed on the pre-hydrogenation feed?
Very fine coke powder is difficult to block; it will definitely pass through the filter and enter the reactor bed!