Pretreated hydrogen cycle purity
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In reformation pre-hydrogenation, the olefin content is much higher due to cut-in; why is there so much methane in the recycle hydrogen? The hydrogen purity is 84% and the methane content is 12% – is a hydrocracking reaction taking place?
Among the impurities in recycled hydrogen, methane undoubtedly constitutes the largest proportion, as it is the lightest hydrocarbon and the component that is least readily separated from recycled hydrogen through compression.
There is a lack of data on supplementary hydrogen; it is possible that the presence of too many long-chain molecules leads to more cracking reactions in the final reactor, resulting in a high methane content in the supplementary hydrogen. In pre-hydrogenation, there are not as many cracking reactions