I am designing a process based in a solid catalyst (a 40 um -sized powder) to perform a liquid-phase reaction. At the end, a slurry is obtained, from which catalyst must be separated to be reused.
Does anyone know which is the preferred way to acomplish this at the industrial level? Is the slurry taken out of the reactor and filtrated in a dedicated equipment? or is there an established procedure to do it inside the reactor, this is, with no need for additional equipment (i.e. filter)? I have not found any precise literature examples so far.
Dear Daniel,
A recent publication published in 2015 entitled " Slurry reactor system with inertial separation for Fischer-Tropsch synthesis and other three-phase hydrogenation processes" describes the use of novel system in which a continuous operation reactor system ensures the presence of catalyst in the reaction mixture stays nearly constant while a minimum is withdrawn with the reaction products:
The Canadian Journal of Chemical Engineering Volume 94, Issue 3
March 2016 Pages 518–523
Valery I. Savchenko, Viktor G. Dorokhov, Iren A. Makaryan, Igor V. Sedov, Vladimir S. Arutyunov
An original inertial principle of solid and liquid phase separation and the construction of a slurry reactor system on this basis are investigated. A continuous operation reactor system ensures the presence of catalyst in the reaction mixture stays nearly constant while a minimum is withdrawn with the reaction products. The results of hydraulic tests on the developed system, consisting of reactors with volumes of 0.02 and 1.0 m3 and equipped with mechanical agitators, are discussed. The effect of agitation velocity on the velocity of slurry moving in the circulation loop, as well as the extent of withdrawal of solid particles with the clarified liquid stream leaving the reaction system, are investigated in detail. Technical characteristics of the developed reactor system for industrial-scale Fischer-Tropsch synthesis, hydrogenation, and other three-phase processes are discussed.
http://onlinelibrary.wiley.com/doi/10.1002/cjce.22413/full
Hoping this will be helpful,
Rafik
In a continuous waste water treatment reactor we use a 10 micron catalyst and use ceramic non clogging 5 micron candle filters which allows liquid seperation while retaining the catalyst.
What are the main differences between an ebullated reactor and a slurry reactor?
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