Urgently need to know why the hydrogenation reactor needs to be taken out when switching to a medium-pressure gas cycle for hydrogen production
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Urgently need to know why the hydrogenation reactor needs to be taken out when switching to a medium-pressure gas cycle for hydrogen production
Medium-pressure gas contains CO and CO2; CO will react with the nickel in the carbonyl hydrogenation catalyst, causing its deactivation
Since the circulating gas contains CO and H2, these gases undergo methanation reactions in the hydrogenation reactor, releasing a large amount of heat that can damage the catalysts in the hydrogenation reactor.
We switch to the large-loop mode only after the replacement is approved, so there is no need to remove the hydrogenation reactor
There’s no need to rush; it’s fine to wait until there is no temperature rise in the hydrogenation reactor before stopping the circulation. If the circulation is stopped right after making the change, it won’t be possible to ensure that all components of the feed gas have reacted completely, which could affect the conversion catalyst. :)
It’s mainly a problem with CO and CO2, I guess
Carbon monoxide and carbon dioxide in the medium-pressure gas react with hydrogen in a methanation reaction to produce methane and water, releasing a large amount of heat in the process. Hydrodesulfurization catalysts all use y-Al2O3 as a carrier. In recent years, industrial hydrodesulfurization catalysts using TiO2 and TiO2-Al2O3 as carriers have come into use; these catalysts exhibit higher activity and selectivity than the former ones, and can tolerate a CO+CO2 content of no more than 10%. Hope this helps you
If the recycled gas doesn’t enter the converter after the modification, how could it affect the conversion rate?
This post was last edited by Green Lotus on 2018-11-22 at 15:34. What is the temperature in the gas shift cycle during hydrogenation reactions? Will methanation occur? Is the reaction temperature sufficient? Also, does the hydrogenation reactor mentioned by the original poster refer to the hydrogenation reactor used for desulfurization?