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Changing from a batch reaction to a continuous reaction

2019-07-16View Original

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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?
Reply #22019-07-16
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.
Reply #32019-07-22
Multiple reasons. In addition to what was mentioned above, the influence of the medium phase on the reaction rate is also a factor.
Reply #42019-07-23
Find someone who specializes in fluid mechanics to help you calculate the pressure, temperature, and component concentration distributions
Reply #52020-03-13
“Xunkai Catalysts boasts a comprehensive range of hydrogenation catalyst products, including those based on Raney nickel, supported nickel, copper-zinc, copper-silicon systems, as well as catalysts on precious metal carriers – both in powder form and for fixed-bed use. These catalysts have been successfully applied in processes such as hydrogenation, dehydrogenation, reductive amination, and desulfurization across industries including those involved in 1,4-butanediol, caprolactam, fatty alcohols, organic amines, butyl octanol, HPPO, petroleum resins, dye intermediates, as well as pharmaceutical and pesticide intermediates. For technical inquiries, please contact Manager Mei at 17701646014

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