Factors affecting solid-liquid heterogeneous reactions in reaction vessels
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In large-scale production processes, when heterogeneous reactions between solid and liquid phases occur, the reaction efficiency is often very poor! ! ! I would like to ask the experts and colleagues how to improve this? Equipment, process, phase catalyst, -------Other: handshake
The mixing efficiency is too poor; this issue can be resolved by changing the design of the mixing blades to improve accuracy. Catalysts need not be considered for now. You can contact me if needed. Phone: 013506124437 Zhang
If the process works well on a pilot or pilot-scale basis, it indicates that there are basically no major issues with your process. Personally, I think it’s very likely that the mixing effect is poor; considering using a progressive mixer with baffles might be a good option! To improve the solid-liquid mixing effect and accelerate the reaction rate!
Stirring is a crucial factor; one should not consider only the speed of stirring, but also the method of stirring, as well as the direction and pattern of the water flow during stirring.
Scaling up heterogeneous reactions is a very complex issue; the poor reaction efficiency is mainly due to mass transfer problems, and the mixing effect in the reactor needs to be improved!
I personally think we need to give more thought to the mixing method
1. From the perspective of reaction kinetics, the main factors affecting solid-liquid heterogeneous reactions are mass transfer rate and temperature. At a constant temperature, the larger the solid-liquid contact area per unit time, the more favorable it is for the reaction to proceed. Therefore, engineering considerations are necessary regarding the equipment – such as the type of stirring and the stirring speed. General experience suggests that progressive mixing is better than anchor or other types of mixing, with the mixing speed controlled at 120 revolutions per minute. 2. From a process perspective, catalysts certainly have a significant impact on the reaction rate as well, but this needs to be considered on a case-by-case basis for different reactions; general experience suggests that phase-transfer catalysts are better than ordinary catalysts.