Why is desulfurization difficult for hydrogenated coke with a high dry point?
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Due to inventory issues, it is necessary to increase the proportion of coke chips. However, when the amount of coke chips increases, the sulfur content in diesel rises; it was originally only 2 ppm, and after making some adjustments, there has been a tendency for this value to increase further. I’m worried that I won’t be able to keep it under control if I make more adjustments. I would like to ask everyone why it’s difficult to remove sulfur from coke chips when their dryness level is high.
Personal opinion: Coker diesel contains high levels of ammonia nitrogen, and ammonia nitrogen inhibits the hydrogenation reaction of diesel, which is why the desulfurization effect is poor.
Besides increasing the hydrogen-to-oil ratio and raising the reaction temperature, what other methods can be used to improve the desulfurization effect?
Dry gas contains a high proportion of heavy components, and the sulfur-containing aromatic compounds in these heavy components have complex structures, making desulfurization difficult