Advantages and disadvantages of top feeding and bottom feeding in reactors?
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Advantages and disadvantages of top feeding and bottom feeding in reactors?
I’ve never seen a fixed-bed reactor fed from the bottom
This post was last edited by libingtaoff8 on 2017-3-7 at 18:53. The feed location is chosen depending on the process: for fixed-bed reactors, feeding takes place from the top, while in bubbling and suspended-bed reactors it occurs from the bottom. The difference lies in the catalyst inlet – in bubbling-bed reactors, fresh catalyst is added from the top, while used catalyst is removed from the bottom; in suspended-bed reactors, catalyst enters together with the feed material and hydrogen from the bottom, after which oil, gas, and catalyst are separated, with the separated catalyst being returned to the bottom of the reactor. . .
Adding to what was said above: for the currently popular liquid-phase hydrogenation, these are the two feeding methods. They are two different processes: one is the DuPont process, and the other is a domestic technology. Each has its advantages and disadvantages.
In traditional trickle-bed reactions (cyclic hydrogen + oil products), the flow is generally from top to bottom. In liquid-phase hydrogenation, hydrogen is generally introduced from below and discharged from above, which ensures uniform mixing of hydrogen and uniform flow within the bed