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Why does the performance of some liquid phases deteriorate when switching from batch hydrogenation in a reactor to continuous hydrogenation in a fixed-bed reactor? The same catalyst and the same reaction conditions are used (including temperature, pressure, liquid space velocity, H2/oil volume ratio, and other such conditions). What is the reason? Poor heat and mass transfer?
Both mass transfer and heat transfer have an impact, and the form of the catalyst also varies. Catalysts in the form of powder are generally used in reaction vessels, while granular catalysts are used in fixed-bed systems; there are also differences in mass transfer between granular and powdered forms; The amount of catalyst used also varies; very little catalyst is added to the reactor, and based on that, the actual space velocity is quite high ; If the heating of the raw materials, the reaction itself, and the cooling all take place within the reactor, the actual reaction time is relatively long ; Reactor vessels are typically equipped with high-speed stirring to facilitate contact among the gas, liquid, and solid phases ; Heating methods are also available for reaction vessels; these vessels are generally large in size, resulting in relatively high wall temperatures.
Multiple reasons. In addition to what was mentioned above, the influence of the medium phase on the reaction rate is also a factor.
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