Cyclic Hydrodesulfurization
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Dear friends, does the circulating hydrogen of the hydrotreating unit need to remove hydrogen sulfide and then increase the pressure to mix with new hydrogen? Whether the setting of the circulating hydrogen desulfurization tower is related to the raw material of the hydrotreating unit. Thank you!
It should be related to the raw materials. Whether the circulating hydrogen needs to undergo desulfurization treatment mainly depends on how high the concentration of hydrogen sulfide in the circulating hydrogen is. If the circulating hydrogen concentration of the device is too high for a long time, it will have an adverse effect on the desulfurization reaction in the hydrorefining reaction and will also cause high corrosion, especially when processing high-sulfur raw materials. However, the hydrogen sulfide content in circulating hydrogen cannot be too low. Too low will not only affect the catalyst, but also be detrimental to the denitrification reaction. In actual production, the hydrogen sulfide concentration in circulating hydrogen must be controlled to be greater than 130 mg per cubic meter. I think cyclic hydrogen desulfurization is a big trend and should be applied in production no matter what aspect.
Generally speaking, we* * The sulfur content of self-produced crude oil is relatively low, so refineries in the north do less circulating hydrogen desulfurization. On the contrary, coastal refineries that use Middle Eastern crude oil as the main processing raw material do more desulfurization.
In addition to the properties of raw materials, it is mainly related to the catalyst
It seems that my device will be installed in the desulfurization tower, and at the same time, the H2S content online analyzer will be used to control the circulating hydrogen concentration.