What are the effects of increased feed viscosity in a hydrogenation unit?

The properties of the raw materials change, which affects the depth of the reaction and has a significant impact on the catalyst bed

It tends to coking, blocking equipment such as high-pressure air coolers, right?

An increase in the viscosity of the feedstock raises the resistance within the reaction system, causing the material to coking more easily in the heating furnace and reactor; in severe cases, this can affect the lifespan of the catalyst.

An increase in viscosity raises the load on the pump; an increase in current increases the load on the catalyst, accelerating carbon deposition. If the operating parameters are not adjusted in a timely manner, the quality of the product will be affected

What are the effects of increased feed viscosity in a hydrogenation unit? ⒈The load on the feed pump increases ； ⒉It can easily cause a high pressure drop in the feed heat exchanger ； ⒊The catalyst tends to coking ； ⒋To ensure the product quality is satisfactory, it is necessary to increase the reaction temperature and the amount of fresh hydrogen.

It causes an increase in the filter pressure drop, as well as an increase in the current drawn by the pump motor. It also leads to channeling within the reactor, resulting in uneven distribution of the feed material within the reactor and an increased radial temperature difference across the bed. It also affects the fractionation section, with a significant difference in temperature rise across the individual beds

So, what measures can be taken to reduce the viscosity of the raw materials, thereby preventing the aforementioned adverse effects?

The dosage of the reaction scale inhibitor can be increased appropriately.

It mainly accelerates coking in the catalyst bed, affects the catalyst’s lifespan, and shortens the startup time

An increase in the viscosity of the feed material raises the resistance within the reaction system, making it easier for the material to coking in the heating furnace and reactor. In such cases, adjustments can be made at the upstream stage to minimize any significant impact on the downstream system.

An increase in the viscosity of the raw material leads to the following issues: 1. It causes large fluctuations in the liquid level of the raw material buffer tank. 2. The pump’s power consumption increases. 3. The pressure difference before and after the heat exchanger for the raw materials and the produced oil increases. 4. The reactor bed level rises significantly. 5. One reverse, two reverses, temperature drops. 6. The load on the reaction feed heater increases. 7. The high-pressure gas separation effect is poor, resulting in an increase in temperature after air cooling. 8. The separation of oil and water at low temperatures is not effective. 9. The poor oil-water separation efficiency at low temperatures causes the mixture to reach the hydrogen sulfide removal tower, leading to an increase in pressure in that tower and pressure fluctuations. My skills are limited, so this is all I can come up with. I hope experts can offer more guidance.

⒈The load on the feed pump increases； ⒉It can easily cause a high pressure drop in the feed heat exchanger ； ⒊The catalyst tends to coking, affecting its lifespan ； ⒋To ensure the product quality is satisfactory, it is necessary to increase the reaction temperature and the amount of fresh hydrogen. 5. The service life of the raw material filtration system is reduced, and it is prone to clogging

I’m not quite sure why it leads to a reverse reaction, a second reverse reaction, and a drop in temperature.

1. The energy consumption of pumps and furnaces increases. 2. The service life of the catalyst is reduced. 3. It is necessary to increase the amount of recycled hydrogen to facilitate fluid flow; otherwise, coking in the furnace tubes will occur. 4. The product does not meet the standards, and it is necessary to readjust the temperatures of various fractions