Issues related to the catalytic dehydrogenation of long-chain alkanes
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In the catalytic dehydrogenation process of long-chain alkanes, why is it necessary to mix the feedstock with hydrogen and then heat it before feeding it into the reactor for catalytic dehydrogenation? As far as I know, catalytic hydrogenation is a reversible reaction, with hydrogen acting as one of the reaction products. When hydrogen is added, its partial pressure increases, which should hinder the progress of the forward reaction, right? Even if it must be added, why add it before heating? Doesn’t that require higher-grade materials for the heating equipment and pipes?
Hehe, you should look for a book on this topic; it’s not easy to explain in just a short time. Since I thought it was common sense, I didn’t delve into it further. It is mainly related to the reaction conversion rate and selectivity; for example, when there are only hydrocarbons present, a low amount of H2 at high temperatures results in a cracking level that is unacceptable
Thank you for the advice from above; I hope you can recommend some books on this topic.
What you mentioned is only the chemical equilibrium relationship; there is also thermodynamic equilibrium during the reaction process. Under certain temperature conditions, thermodynamic equilibrium has a greater impact on the reaction. Furthermore, the purposes of mixing hydrogen and pre-furnace hydrogen mixing are three: 1) to reduce coking in the furnace tubes and catalysts; 2) to achieve a more uniform distribution of the material within the reactor bed, which facilitates the reaction process. 3. An increase in circulating material facilitates the removal of the reaction heat from the reaction layer
Selective hydrogenation to increase the yield of monoolefins.