What problems does the nitrogen content in circulating hydrogen reflect?
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There is a set of data below: Nitrogen content in prehydrogenation cycle hydrogen: 0. 69% ； Nitrogen content in reforming cycle hydrogen: 0. 2% ； Nitrogen content in hydrogen in diesel hydrogenation cycle: 0. 8% Nitrogen content in hydrogen in jet fuel hydrogenation cycle: 0. 26% Nitrogen content in cracking cycle hydrogen: ⒈67% ； Nitrogen content in hydrogen in residual oil hydrogenation cycle: ⒈72% ； What problems can be reflected from the nitrogen content in circulating hydrogen?
We rarely pay attention to this problem. From the data, it seems to be related to the nitrogen content in the raw materials, such as residual oil, which is the highest.
It mainly reflects the nitrogen content in the raw material, the reaction denitrification ability, and whether the reaction water injection volume can meet the requirements for dissolving ammonium salt.
We have never analyzed the nitrogen content in hydrogen. Is the analysis result nitrogen element or nitrogen compound? If it is nitrogen element, it should be related to the protection of nitrogen in the raw material. If it is nitrogen compound, the hydrogenation depth may not be enough.
My understanding is: The nitrogen in the raw material becomes NH3 after hydrogenation, and the NH3 is immediately mixed with the hydrogen. Although the water injection in the air cooling area can remove part of the NH3, some of it cannot be removed and remains in the circulating hydrogen. It can be seen from the poster's data that the heavier the feed oil, the higher the nitrogen content in the circulating hydrogen. The distribution of N in various crude oil fractions is that the heavier the fraction, the higher the N content. The higher the N content, the more NH3 produced by hydrogenation, so the N content in the circulating hydrogen is high. I don't know if my understanding is correct. I welcome everyone's criticism and correction.
It may be that the inert gas brought in by the new hydrogen accumulates in the reaction system and some inorganic nitrogen compounds (ammonium) are generated by the denitrification reaction of the reaction system. Please analyze the content of the inert gas (main nitrogen) in the new hydrogen.
Oh, thanks for the advice, senior! !