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Aren’t the naphtha components compressed into the diesel and kerosene components? Our fractionation tower has two side withdrawals. Besides, should the reactor temperature be adjusted evenly in each bed? Should the temperature in the post-refining section be kept higher to facilitate the removal of mercaptans? I think the inlet and outlet temperatures of each bed should be equal or similar? Please give me more advice.
I feel that the poster's question is a bit confusing. For hydrogenation reactors, the most ideal operating state is isothermal operation, which means that the temperature rise of each bed is the same and the entrance and exit temperatures of each bed are the same. However, this cannot be achieved in actual operation. In post-refining operations, mercaptanization is the easiest desulfurization reaction to perform. Generally, it can be removed at 300~350 degrees. There is no need to deliberately maintain a higher temperature. The cracking reaction bed temperature should be adjusted in time according to the properties of the oil and the actual reaction depth. Reducing the reaction depth has nothing to do with pressing the components in the naphtha into the tail oil. Reducing the reaction depth just increases the heavy components in the produced oil. In addition, why should the naphtha component be pressed into the tail oil? The incorporation of the naphtha component into the kerosene component may be due to changes in the production plan, requiring more kerosene to be produced. When too much naphtha is pressed into jet fuel and diesel components, the flash point of these products cannot be guaranteed. If naphtha is pressed into the tail oil, the tail oil pump will be easily evacuated.