Fabrication Of Flow Microreactor By 3D Printing And Its Application In Electrochemistry

Reactor is one of the important parts of traditional catalytic system,which has the important function of providing suitable environment for various catalytic reactions.Compared with the conventional batch reactor,the flow microreactor has the advantages of large surface volume ratio,precise control of temperature and residence time,extremely fast molecular diffusion,and higher safety in the reaction process.Because of these advantages,the research on the combination of flow microreactor and electrochemistry has attracted extensive attention from the academic and engineering circles.However,due to the complexity of electrode material structure design,the difficulty of fabrication process and the cost of complex system,the development of electrochemical flow microreactor is limited.In view of the above problems,a new electrochemical flow microreactor was developed and designed by using 3D printing technology and its application in the field of electrochemistry was explored,which expanded the design idea of flow microreactor and provided an economical and effective choice.Specific research contents are as follows:(1)For the overall design and assembly of the electrochemical flow microreactor,the planar design and interfingered electrode configuration were adopted,and the integrated structure of microchannel and electrode was designed and prepared by using 3D printing technology,thus a new 3D printing flow microreactor was developed.The chemical stability of 3D printed materials was tested,and it was proved that the photosensitive resin used in the experiment showed good stability in most of the reagents,and could be effectively applied to electrochemical microreactor components,supporting most electrochemical application research.Combined with electroplating technology,the electroconductivity of photosensitive resin of 3D printing material is realized,and the electrode part of the reactor is solved.Electroplated copper,nickel and platinum electrodes have been successfully obtained.The method is universal.The electrical resistance of electroplated metal electrode is close to that of copper foam and nickel foam,and it has good electrical conductivity.The electrochemical flow microreactor was assembled by tapping method,which has the characteristics of low cost,rapid and efficient molding,and customization.In addition,the configuration design of the reactor makes it possible to combine with light.(2)Study on the feasibility and application of electrochemical flow microreactor.In this reactor system,the photodegradation experiments of phenol compounds synthesized by aryl boric acid,aniline synthesized by phenylboronic acid and methyl orange were carried out,and the experimental conditions were optimized to improve the reaction effect.The results showed that the highest yield of phenol was 92.7%,and the conversion and selectivity of phenol were higher than 90%when the residence time was 150 min and 0.7V.On this basis,the substrate was expanded to obtain a good yield and conversion rate,which enriched the range of use of the flow reactor;The experimental conditions for electrosynthesis of aniline by phenylboronic acid were optimized.It was found that the optimum reaction conditions were 0.2 V and 150 min,and the yield of aniline reached 76.2%.In the photoelectric degradation experiment of methyl orange,the photoelectric synergistic effect is better than the photoelectric single condition effect,which verifies the design guess of photoelectric microreactor to a certain extent.These experiments fully demonstrate the feasibility of the electrochemical chemical microreactor,expand the design idea of the flow reactor,and have a very wide application prospect.