Hydrogenation reaction — Catalyst bed pressure drop

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This post was last edited by fangyuan5687 on 2019-8-24 at 15:52. Dear colleagues: I have been recently working on calculations of the pressure drop across the catalyst bed in hydrogenation reactors, referring to the book \"Catalytic Reactor Engineering\" to study the pressure drops in trickle beds and bubble columns. However, I encountered a problem: none of the formulas in the book come with explicit explanations regarding the symbols used (such as what the meaning of those symbols is or what units they should have in the formulas) ), there is little explanation of formulas and basic concepts, and the formulas and basic concepts used in different parts of the text sometimes appear suddenly. Let’s discuss together topics such as the pressure drop calculation in 2.2.3 (P49–51, for trickle beds) and the pressure drop calculation in 2.3.3 (P78, for bubble beds), to understand how these concepts and formulas work. For example, dp and dt appear multiple times in the corresponding sections of the text, but there is no explanation as to what parameters they are or what their units are; one can only guess based on the examples. There is another issue: in both types of pressure drop calculations, the porosity of the bed layer is used. What value should be used for the porosity of hydrogenation reaction catalysts? What is its relationship to the geometric size and shape of the catalyst? Where can I obtain these data?