Bed in slurry bed hydrogenation”

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The middle and lower parts of the slurry-bed hydrogenation reactor are the bubbling zone, which is a type of fluidized bed, while the upper part is the foaming zone. What sets it apart from the catalytic cracking circulating fluidized bed is that the \"bed\" is not a gas-solid two-phase flow but rather a gas-liquid-solid three-phase system; catalysis takes place in both dense and dilute phases, while the slurry bed has a bubbling phase and a foaming phase, along with a high-viscosity slurry phase and a gas phase ； “The “bed” is not a substrate-supported selective catalyst for catalytic cracking, but rather the indestructible elemental MoS ； “The “bed” is not a lift pipe or a regenerator, but rather a slurry phase in which the dispersed phase exists at a certain viscosity; the catalyst concentration is high, the dispersion is excellent, suspension is stable, mixing is intense, and there is balanced lift. What they have in common is that initial operation requires time to build up a reserve volume; all of them need a certain circulation rate (as required for the Mo concentration at the bottom of the slurry-bed vacuum tower) in order to initiate the reaction; and all of them require replenishment to account for losses. Therefore, the term “suspended bed” as defined domestically gives a more animated feel and better highlights the form in which CAT exists.