Three-phase microreactor with porous foam structure using microbubbles to enhance mass transfer

Abstract

The invention discloses a three-phase microreactor with a porous foam structure and capable of enhancing mass transfer by utilizing microbubbles. The three-phase microreactor comprises an upper coverplate, a runner plate and a lower bottom plate which are sequentially arranged from top to bottom, and is characterized in that a rectangular groove is formed in the middle of the runner plate, the bottom of the rectangular groove is of a hollowed-out structure, the periphery of the rectangular groove protrudes upwards to form a step, and a ceramic membrane is horizontally placed on the step; a porous foam plate is placed on the ceramic membrane, and a catalyst is loaded on the porous foam plate; the top of the porous foam plate and the top of the runner plate are positioned on the same horizontal plane; a cavity is formed between the lower bottom plate and the ceramic membrane and is used as a gas flowing space; an air inlet is formed in the middle of the lower bottom plate and is positioned below the ceramic membrane; a first tree-shaped runner and a second tree-shaped runner are arranged on the runner plate and located on the two sides of the rectangular groove respectively and serve as an inlet channel and an outlet channel for liquid-phase reactants. The microreactor can be widely applied to the fields of chemical engineering and environmental protection.

Description

technical field [0001] The invention relates to the field of microreactors, in particular to a three-phase microreactor with a porous foam structure which utilizes microbubbles to enhance mass transfer. Background technique [0002] In the field of heterogeneous catalysis, catalyst supports play a key role, such as: (1) dispersing the active phase to increase the density of reactive sites; (2) improving the activity of nanoparticles ( NPs), thereby reducing the problem of catalyst deactivation caused by sintering; (3) promoting the adsorption of reactants to the active sites and the rapid desorption of intermediate products; (4) reducing the risk of local hot spots in exothermic reactions Formation, thereby avoiding the reduction of the selectivity of the target product and improving the safety of the operation. [0003] So far, in the field of heterogeneous catalysis, few new catalyst supports have been introduced, and the catalytic process still uses supports developed de...

AI Technical Summary

Problems solved by technology

However, when the gas-liquid two-phase enters the porous foam structure as a reactant, the gas will form gas channels inside the porous material. At the same time, the number of gas channels is greatly affected by the pore size of the porous material, and fewer gas channels will directly affect the gas-liquid flow. The contact area of ​​the two-phase reactants. At this time, the gas has to overcome the resistance of the liquid film to reach the active site of the catalyst to react. The large transmission resistance will seriously affect the performance of the microreactor. At the same time, it will also make part of the catalyst unusable, thus Reduced catalyst usage efficiency

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