The influence of hydrogen-to-oil ratio on hydrofining
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Recently, the sulfur content in crude oil has increased, affecting the products; increasing the hydrogen-to-oil ratio further increases the sulfur content in the products. What is going on?
On the one hand, the catalyst has poor activity. On the other hand, the desulfurization efficiency of the catalyst has reached its limit; increasing the hydrogen-to-oil ratio shortens the contact time between the material and the catalyst, resulting in a decrease in the desulfurization rate. You might try reducing the air velocity or increasing the temperature to see
Increasing the hydrogen-to-oil ratio is not sufficient to react away the excess sulfur in the feed; I agree with the opinion above – reduce the processing volume or increase the temperature.
The analysis is very accurate; what should be done at this point is not to increase the hydrogen-to-oil ratio, but rather to reduce the processing volume and increase the effective residence time of the oil in the catalyst bed!
Increase the refining effect and raise the temperature of the bed layer in the refining section.
Raising the temperature should work, right?
Raise the temperature without reducing the volume – that’s the solution
By reducing the flow rate and increasing the temperature, the hydrogen-to-oil ratio has little effect in this case····
Has there been any change in the temperature rise of the reactor bed? If it remains unchanged compared to before, it indicates that the sulfur content in the feedstock is high. If the temperature rise of the bed decreases, it suggests that the catalyst’s activity has declined. According to the opinion mentioned above, it is possible to reduce the feed amount or increase the temperature; when increasing the temperature, pay close attention to changes in the bed temperature. If the outlet temperature becomes too high, it is possible to use more cold hydrogen.
An excessively high hydrogen-to-oil ratio, too fast space velocity, and a short residence time of the oil result in reduced reaction depth; it’s not true that the higher the hydrogen-to-oil ratio, the better!
The catalyst activity has decreased. Reduce the volume or increase the temperature. Generally, we choose to increase the temperature only in the later stages