The gasoline hydrogenation unit uses Axens’ PG+ technology from France; it has passed the Dr. Gasoline test – what’s the solution?
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Dear colleagues: Recently, the gasoline produced by our company through gasoline hydrogenation failed the Drayton test; we are currently investigating the reasons. Have any of you encountered such a situation? How was it solved? Solve
I don’t know how many processing steps you have; were large molecular thiols formed later on?
In the case of light gasoline, it’s possible that the extraction volume is too high, causing the high temperature at the top of the tower to carry the mercaptans along with it. Another issue is that the conversion in the first reactor is not good; it’s necessary to adjust the hydrogen supply and the reactor temperature
The product has a high thiol content; attention should be paid to the SHU reaction temperature, the amount of hydrogen used, the cutting points in the distillation column, the separation efficiency of the reflux tank, and the volume of acidic gases discharged from the stabilizer reflux tank, among other things
Using France’s Axens PG+ technology, the Gasoline Doctor test and water-soluble acidity and alkalinity tests seem to have failed in Shandong.
If there is desulfurization of thiols afterward, it means that the thiols haven’t been removed completely. It’s necessary to check whether the concentration of the alkali solution used for desulfurization is too low, or whether the oxidation and regeneration process in the alkali solution regeneration tower isn’t effective enough… I hope this can help you
It is also necessary to consider the final boiling point of the raw materials; if it is too high, it will affect the quality of the product
Several refineries in Shandong failed the tests, so desulfurization and deodorization systems were added.