How to reduce the sulfur content in hydrogenated naphtha
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For ordinary gasoline and diesel hydrogenation units, the designed sulfur content in gasoline is 1 ppm; however, the actual level during testing is 20 ppm. How can this sulfur content be reduced? I would appreciate any advice from experts
Consider increasing the temperature of the hydrogenation reactor appropriately； Also, check whether the sulfur content in the feed exceeds the design value
We added another pentane stripping tower behind the hydrogen sulfide stripping tower top. The content of refined naphtha has remained in the range of a few ppm
First, you need to determine whether all the sulfur in the oil is inorganic sulfur? If there is a considerable amount of organic sulfur, it indicates that the hydrogenation concentration is insufficient; in such cases, the reasons should be sought in aspects such as process operating conditions, catalyst activity, and the total sulfur content of the feedstock, after which the process conditions should be adjusted. If all of this sulfur is in the form of hydrogen sulfide, it indicates that the stripping of the hydrogenated product is insufficient, or that the gas-liquid separation is poor, resulting in insufficient removal of hydrogen sulfide dissolved in the oil. If there is some elemental sulfur present, it may be due to low hydrogen purity, an inappropriate hydrogen-to-oil ratio, or poor stripping operation in the stripper. Personal opinion.
They’re all experts; I think crude oil is the more likely option. Then consider the issues with the device itself.
In this regard, the reaction depth seems to be insufficient; it is necessary to increase the reactor temperature. Doctoral-level experiments can be conducted to investigate this. If adding sodium leadite causes a color change, it indicates the presence of inorganic sulfur. It is also necessary to increase the amount of stripping steam and reduce the stripping pressure. If adding sulfur powder results in a color change, then thiol compounds are present, and it is required to raise the temperature of the tower
1. Increased reaction depth 2. Increased steam at the bottom of the naphtha stripping tower