| 浅野 周作（あさの しゆうさく） | データ更新日：2024.04.01 |
助教 ／
先導物質化学研究所
先端素子材料部門
| 1. | Shusaku Asano, Shinji Kudo, Taisuke Maki, Yosuke Muranaka, Kazuhiro Mae, Jun-ichiro Hayashi, Assessing mixing uniformity in microreactors via in-line spectroscopy, Chinese Journal of Chemical Engineering, 10.1016/j.cjche.2023.09.009, 66, 119-124, 2024.02. |
| 2. | Qianli Wang, Hiroki Komatsu, Shinji Kudo, Shusaku Asano, Jun-ichiro Hayashi, Green synthesis of binder-free plate from waste bamboo based on hydrothermal treatment, Biomass Conversion and Biorefinery, 10.1007/s13399-024-05437-0, 2024.02. |
| 3. | Shusaku Asano, Hiroyuki Miyamura, Mizuki Matsushita, Shinji Kudo, Shū Kobayashi, Jun-ichiro Hayashi, Impact of gas-solid direct contact on gas-liquid-solid reaction performance in a flow reactor, Journal of Flow Chemistry, 10.1007/s41981-023-00295-9, 2023.11. |
| 4. | Aditya Wibawa, U. P. M. Ashik, Shinji Kudo, Shusaku Asano, Yusuke Dohi, Tetsuya Yamamoto, Jun-ichiro Hayashi, Control of Reactivity of Formed Coke from Torrefied Biomass by Its Washing with Torrefaction-derived Acidic Water, ISIJ International, 10.2355/isijinternational.isijint-2022-537, 63, 9, 1545-1556, 2023.09. |
| 5. | Yosuke Muranaka, Taisuke Maki, Daiki Nakayoshi, Shusaku Asano, Katsuya Ikebata, Aiichiro Nagaki, Yosuke Ashikari, Kyoko Mandai, Kazuhiro Mae, Continuous enantiomeric separation using water-oil-water segmented flow system, Chemical Engineering Journal, 10.1016/j.cej.2023.143891, 469, 143891-143891, 2023.08. |
| 6. | Nikolay Cherkasov, Shusaku Asano, Yuta Tsuji, Kazuki Okazawa, Kazunari Yoshizawa, Hiroyuki Miyamura, Jun-ichiro Hayashi, Alexander A. Kunitsa, Samuel Jackson, Mechanistic origins of accelerated hydrogenation of mixed alkylaromatics by synchronised adsorption over Rh/SiO2, Reaction Chemistry & Engineering, 10.1039/d3re00032j, 8, 6, 1341-1348, 2023.03, We have studied the unique reaction acceleration phenomenon in the mixture and discussed the limitations of the Langmuir–Hinshelwood model for a solid-catalysed reaction. . |
| 7. | Asano, S., Maki, T., Inoue, S., Sogo, S., Furuta, M., Watanabe, S., Muranaka, Y., Kudo, S., Hayashi, J.-I., Mae, K., Incorporative mixing in microreactors: Influence on reactions and importance of inlet designation, Chemical Engineering Journal, 10.1016/j.cej.2022.138942, 451, 2023.01, Fast mixing is an essential feature of a microreactor. This study reveals the critical role of microscopic fluid incorporation on fast chemical reactions in a microreactor. The vortices in a microreactor produce tiny fluid segments, and the incorporation of these segments into the surrounding fluid triggers chemical reactions. The selectivity of chemical reactions highly depends on the type of the fluid segment incorporated into the fluid. Microreactor operations that consider incorporative mixing can achieve better reaction results, even with slow mixing. For example, a tee mixer showed better reaction performance with the vertical confluence configuration than with the symmetric configuration, although the symmetric 180-degree confluence provides more intense mixing. Computational fluid dynamics (CFD) simulations showed that vertical confluence enabled the division and incorporation of a stream from the horizontal inlet into another stream. The appropriate inlet designation is vital when two inlets of a microreactor differ in dimensions, directions, or positions because the different inlets provide different mixing profiles. The two inlets of the microreactor were distinguishable even though the fabrication error was insignificant. For instance, feed orientations changed the side-product yield seven times in a 3D-printed microreactor. Moreover, the impact of incorporative mixing on particle synthesis was confirmed. Switching the two inlets significantly influenced the morphology and size of the synthesized particles by changing the initial nucleation environment. In conclusion, considering incorporative mixing and optimal inlet orientation will enhance the performance and flexibility of microreaction technology.. |
| 8. | Shusaku Asano, Yosuke Muranaka, Taisuke Maki, Koki Ikeda, Kazuhiro Mae, Kinetic Modeling of an Enzyme Membrane Reactor for the Selective Production of Oligosaccharides, Fermentation, 10.3390/fermentation8120701, 8, 12, 701-701, 2022.12, An enzyme membrane reactor is an attractive tool for producing oligosaccharides from biomass-based polysaccharides. However, kinetic modeling and reactor design based on the rate equations have rarely been reported for enzyme membrane reactors because of the difficulty in tracing the depolymerization process. In this study, a simplified reaction model based on Michaelis–Menten-type kinetics has been built to simulate the enzyme membrane reactor. Ramping various species into reactant, target, and byproduct worked well for discussing reactor performance. The use of a membrane with a molecular weight cut-off (MWCO) of 10 kDa with continuous feeding of the reactant was suggested for the efficient production of chitosan hexamer and pentamer by enzymatic hydrolysis of chitosan. . |
| 9. | Phatchada Santawaja, Shinji Kudo, Atsushi Tahara, Shusaku Asano, Jun-ichiro Hayashi, Dissolution of Iron Oxides Highly Loaded in Oxalic Acid Aqueous Solution for a Potential Application in Iron-Making, ISIJ International, 10.2355/isijinternational.isijint-2020-726, 62, 12, 2466-2475, 2022.12. |
| 10. | Wei, F., Kudo, S., Asano, S., Hayashi, J.-I., Torrefaction of woody biomass and in-situ pyrolytic reforming of volatile matter: Analyses of products and process heat demand, Journal of Analytical and Applied Pyrolysis, 10.1016/j.jaap.2022.105658, 167, 2022.10. |
| 11. | U.P.M. Ashik, Nurulhuda Halim, Shusaku Asano, Shinji Kudo, Jun‐ichiro Hayashi, Kinetics and Mechanisms of Selected Reactions over Hydroxyapatite‐Based Catalysts, Design and Applications of Hydroxyapatite‐Based Catalysts, 10.1002/9783527830190.ch5, 163-199, 2022.09. |
| 12. | Shinji Kudo, Xin Huang, Sakura Sakai, Kyoi Fujiki, Shusaku Asano, Jun Ichiro Hayashi, Hydrolysis of Anhydrosugars over a Solid Acid Catalyst for Saccharification of Cellulose via Pyrolysis, Key Engineering Materials, 10.4028/p-3800i8, 932, 3-10, 2022.09, Glucose is a key compound for future biomass-based energy and chemical industry. An availability of glucose from abundant lignocellulosic biomass is limited because of a slow reaction rate and costly feed materials in a conventional enzymatic hydrolysis of cellulose. The present work investigated the production of glucose with hydrolysis of anhydrosugars produced by cellulose pyrolysis that is a fast reaction with no requirement for other chemicals to feed. A commercially available solid acid was employed as the hydrolysis catalyst for enabling a direct use of glucose aqueous solution without posttreatment such as separation. The experiments using a model anhydrosugar, levoglucosan (LGA), as feedstock revealed a selective activity of the catalyst to produce glucose even at the high concentration of 2.7 M and the catalytic stability in 15 h run of the reaction using a continuous flow reactor. The catalyst worked for the reaction with a cellulose-derived bio-oil as the feedstock to selectively produce glucose mainly from LGA. However, the activity gradually decreased due to deposition of carbonaceous materials from compounds other than LGA over the catalyst, indicating the necessity for eliminating those compounds before the hydrolysis.. |
| 13. | Wibawa, A., Ashik, U.P.M., Kudo, S., Asano, S., Gao, X., Hayashi, J.-I., High-Strength Formed Coke from Torrefied Biomass and Its Blend with Noncaking Coal, Energy and Fuels, 10.1021/acs.energyfuels.2c01722, 36, 16, 9121-9132, 2022.08. |
| 14. | Wibawa, A., Ashik, U.P.M., Kudo, S., Asano, S., Dohi, Y., Yamamoto, T., Kimura, Y., Xiangpeng, G.A.O., Hayashi, J.-I., Preparation of Formed Coke from Biomass by Sequence of Torrefaction, Binderless Hot Briquetting and Carbonization, ISIJ International, 10.2355/isijinternational.ISIJINT-2022-013, 62, 8, 1629-1638, 2022.08. |
| 15. | Takuya Kiyozumi, Shinji Kudo, Aska Mori, Riku Mizoguchi, Atsushi Tahara, Shusaku Asano, Jun-ichiro Hayashi, Synthesis of Oxalate from CO2 and Cesium Carbonate Supported Over Porous Carbon, ISIJ International, 10.2355/isijinternational.isijint-2022-159, 62, 12, 2476-2482, 2022.08. |
| 16. | Wang, Q., Kudo, S., Asano, S., Hayashi, J.-I., Fabrication of Densified Rice Husk by Sequential Hot-Compressed Water Treatment, Blending with Poly(vinyl alcohol), and Hot Pressing, ACS Omega, 10.1021/acsomega.2c03286, 7, 31, 2022.07. |
| 17. | Asano, S., Adams, S.J., Tsuji, Y., Yoshizawa, K., Tahara, A., Hayashi, J.-I., Cherkasov, N., Homogeneous catalyst modifier for alkyne semi-hydrogenation: systematic screening in an automated flow reactor and computational study on mechanisms, Reaction Chemistry and Engineering, 10.1039/d2re00147k, 7, 8, 1818-1826, 2022.06, 21 types of modifiers are screened for palladium catalysed semi-hydrogenation of alkynes with varying catalyst type, reaction time, and target substrate using an automated flow reactor system.. |
| 18. | Wei, F., Kudo, S., Asano, S., Hayashi, J.-I., Staged Pyrolytic Conversion of Acid-Loaded Woody Biomass for Production of High-Strength Coke and Valorization of Volatiles, Energy and Fuels, 10.1021/acs.energyfuels.2c01352, 36, 13, 2022.06. |
| 19. | Saragai, S., Kudo, S., Sperry, J., Ashik, U.P.M., Asano, S., Hayashi, J.-I., Catalytic deep eutectic solvent for levoglucosenone production by pyrolysis of cellulose, Bioresource Technology, 10.1016/j.biortech.2021.126323, 344, 126323-126323, 2022.01. |
| 20. | Wang, Q., Kudo, S., Asano, S., Hayashi, J.-I., Hot-Compressed Water Treatment and Subsequent Binderless Hot Pressing for High-Strength Plate Preparation from Rice Husk, ACS Sustainable Chemistry and Engineering, 10.1021/acssuschemeng.1c07877, 10, 5, 2022.01. |
| 21. | Liu, T., Gao, X., Mofrad, A.Z., Kudo, S., Asano, S., Hayashi, J.-I., Leaching Char with Acidic Aqueous Phase from Biomass Pyrolysis: Removal of Alkali and Alkaline-Earth Metallic Species and Uptakes of Water-Soluble Organics, Energy and Fuels, 10.1021/acs.energyfuels.1c01889, 35, 15, 2021.08. |
| 22. | Igawa, K., Asano, S., Yoshida, Y., Kawasaki, Y., Tomooka, K., Analysis of Stereochemical Stability of Dynamic Chiral Molecules Using an Automated Microflow Measurement System, Journal of Organic Chemistry, 10.1021/acs.joc.1c00914, 86, 14, 9651-9657, 2021.07, An automated microflow measurement system for the kinetic study of racemization of dynamic chiral molecules was developed. This system facilitated the analysis of fast racemization within several seconds at elevated temperatures owing to its rapid heating ability, high performance for controlling short residence times, and ease of connection to HPLC systems for direct measurement of the enantiomeric purity. A more precise analysis was realized by combination of microflow and common batch measurements over a broad range of temperatures.. |
| 23. | Kudo, S., Huang, X., Asano, S., Hayashi, J.-I., Catalytic Strategies for Levoglucosenone Production by Pyrolysis of Cellulose and Lignocellulosic Biomass, Energy and Fuels, 10.1021/acs.energyfuels.1c01062, 35, 12, 2021.06. |
| 24. | Jing Xian Wang, Jun Ichiro Hayashi, Shusaku Asano, Shinji Kudo, Analysis of Primary Reactions in Biomass Oxidation with O |
| 25. | Xin Huang, Shinji Kudo, Shusaku Asano, Jun ichiro Hayashi, Improvement of levoglucosenone selectivity in liquid phase conversion of cellulose-derived anhydrosugar over solid acid catalysts, Fuel Processing Technology, 10.1016/j.fuproc.2020.106625, 212, 2021.02, The pyrolysis of cellulose produces anhydrosugars, levoglucosan (LGA) in particular, as a primary product. In this work, the liquid phase conversion of anhydrosugars over solid acid catalysts was investigated, mainly using LGA, as a method for producing levoglucosenone (LGO), which is a bio-renewable platform for fine and commodity chemicals. The screening of typical organic solvents revealed they had a significant influence on the type of reaction selectivity and identified dimethyl sulfoxide (DMSO) as a suitable solvent. Among the solid acid catalysts examined, Amberlyst 70 in combination with DMSO was found to work the best, producing LGO with a yield of up to 32.3%-C. The yield of LGO was further improved to 40.4%-C by in-situ removal of water, which promoted undesired reactions, such as hydrolysis of LGA and isomerization of LGO to hydroxymethylfurfural. Moreover, an experiment using bio-oil, derived from cellulose pyrolysis, as the feedstock showed that a portion of heavier saccharides contributed as a source of LGO without inhibiting the conversion of LGA.. |
| 26. | 浅野周作, トピックス「フロー式反応器を用いる実験の自動化」, 化学工学会誌, 84, 12, 645-645, 2020.12. |
| 27. | Shusaku Asano, Yu Takahashi, Taisuke Maki, Yosuke Muranaka, Nikolay Cherkasov, Kazuhiro Mae, Contactless mass transfer for intra-droplet extraction, Scientific Reports, 10.1038/s41598-020-64520-4, 10, 1, 2020.12, This study demonstrates the possibility of “contactless” mass transfer between two aqueous slugs (droplets) separated by an oil slug in Taylor flow inside milli-channels. Separation of the alternating aqueous slugs at the outlet was performed by switching a couple of solenoid valves at branched outlets according to signals obtained by an optical sensor at the branch. Transfer of bromothymol blue (BTB) from acidic to basic aqueous slugs was performed for demonstration. In some cases, aqueous slugs separated by oil, merged catching on each other due to the velocity difference. Interfacial tension which was affected by the solute concentration was responsible for the velocity difference. Position-specific mass transfer activity at the rear end of the aqueous slugs was found on the course of the experiment. A meandering channel decreased the velocity difference and enhanced mass transfer. Almost complete (93%) transfer of BTB was achieved within a short residence time of several minutes under optimized conditions. The presented system opens a way for advanced separation using minimum amounts of the oil phase and allows concentrating the solute by altering relative lengths of the sender and receiver slugs.. |
| 28. | Jing Xian Wang, Shusaku Asano, Shinji Kudo, Jun Ichiro Hayashi, Deep Delignification of Woody Biomass by Repeated Mild Alkaline Treatments with Pressurized O |
| 29. | Tianlong Liu, Shusaku Asano, Shinji Kudo, Jun ichiro Hayashi, Sequential conversion of lignite in alkaline water by oxidative degradation, dissolution and catalytic gasification, Fuel, 10.1016/j.fuel.2020.118329, 278, 2020.10, We have demonstrated a sequence of degradation, dissolution and catalytic hydrothermal gasification (CHTG) of lignite in alkaline water. A Victorian lignite was subjected to hydrothermal treatment (HT) in an aqueous solution of NaOH at 250 °C, and then oxidation with pressurized O at 100 °C. The sequential HT and oxidation solubilized a 95% portion of the lignite on mass/carbon bases. The resulting solution was further converted by CHTG in a flow reactor at 350 °C for 10 h, employing a ruthenium/activated-charcoal catalyst (ruthenium loading; 16 wt%). The initial carbon conversion to gas was as high as 98% while CH , CO and H were produced. The conversion gradually decreased due to coke deposition over the catalyst but was near steady around 83% at 8–10 h. The solubilized lignite consisted of compounds with molecular mass up to 5,000. The heavier portion (molecular mass > 1,000) was responsible for the coke formation and accumulation that caused the catalyst deactivation. 2 4 2 2. |
| 30. | Phatchada Santawaja, Shinji Kudo, Aska Mori, Atsushi Tahara, Shusaku Asano, Jun Ichiro Hayashi, Sustainable Iron-Making Using Oxalic Acid: The Concept, A Brief Review of Key Reactions, and An Experimental Demonstration of the Iron-Making Process, ACS Sustainable Chemistry and Engineering, 10.1021/acssuschemeng.0c03593, 8, 35, 13292-13301, 2020.09, Global iron and steel production continues to expand. The iron-making industry is, however, one of the main contributors to global warming due to its reliance on fossil fuel-based high temperature processes. Therefore, alternative green approaches to iron-making are highly desired. Herein, we propose a new concept of iron-making, which consists of a sequence of known reactions: the dissolution of iron from iron ore using oxalic acid to obtain a Fe(III) oxalate aqueous solution, followed by the photochemical reduction of Fe(III) oxalate to Fe(II) oxalate as a solid precipitate, and the pyrolytic reduction of Fe(II) oxalate to metallic iron. By harnessing the chemical characteristics of oxalic acid and iron oxalates, the method is expected to produce high-quality iron at low temperatures. Moreover, the recovery of carbon oxides, generated during iron-making, for the synthesis of oxalic acid enables the iron-making without having carbon in the stoichiometry. The present study explains the key chemical concepts of the process, experimentally demonstrates the iron-making, and discusses the challenges and barriers to industrial application. In the experiment, according to the proposed scheme, three different iron sources were successfully converted into metallic iron. The yield and quality (purity) of the iron product depended on the metallic composition of the feedstock. In the absence of impurity metals, near-complete recovery of pure iron was possible. Alkaline earth and transition metals were identified as impurities that affected process performance and product quality. The iron dissolution needed a relatively long reaction time to achieve sufficient conversion under the conditions employed in this study, rendering it a rate-determining step that influenced overall iron productivity.. |
| 31. | Tianlong Liu, Asuka Mori, Ryohei Arai, Shusaku Asano, Shinji Kudo, Jun Ichiro Hayashi, Selective Production of Phenolic Monomers and Biochar by Pyrolysis of Lignin with Internal Recycling of Heavy Oil, Energy and Fuels, 10.1021/acs.energyfuels.0c01164, 34, 6, 7183-7189, 2020.06, Pyrolysis is the simplest way to convert lignin into phenolic compounds as monomers but inevitably producing oligomers as heavy oil (HO). We propose a particular type of pyrolysis, which recycles such oligomers entirely to pyrolysis, employing the parent lignin for their capture/recycling without any chemicals and catalysts. Continuous pyrolysis of a Japanese cedar lignin was simulated by repeating fixed-bed pyrolysis of HO-loaded lignin and demonstrated steady state of yields of gas, water, char, and light oil (LO) that consisted solely of monomers and furans and lower acids, with neither discharge of HO from the system nor accumulation therein. HO was converted to char, water, and LO with once-through conversion of around 47%, which was contributed by not only self-pyrolysis of HO but also its copyrolysis/carbonization with the parent lignin. The HO recycling increases the LO yield by a factor of 1.4. Catechols (catechol and methylcatechols) and guaiacols (guaiacol, 4-ethylguaiacol, creosol, vanillin, and apocynin) constitute 42 and 22 wt % of LO, respectively. The char shows an increased production in the sequential runs with a near-unchanged elemental composition, volatile matter content, and calorific value.. |
| 32. | Yosuke Muranaka, Kenta Matsubara, Taisuke Maki, Shusaku Asano, Hiroyuki Nakagawa, Kazuhiro Mae, 5-Hydroxymethylfurfural Synthesis from Monosaccharides by a Biphasic Reaction–Extraction System Using a Microreactor and Extractor, ACS Omega, 10.1021/acsomega.0c00399, 5, 16, 9384-9390, 2020.04. |
| 33. | Nurulhuda Halim, Akira Tajima, Shusaku Asano, Shinji Kudo, Jun Ichiro Hayashi, Change in Catalytic Activity of Potassium during CO |
| 34. | U. P.M. Ashik, Shusaku Asano, Shinji Kudo, Doan Pham Minh, Srinivas Appari, Einaga Hisahiro, Jun Ichiro Hayashi, The distinctive effects of glucose-derived carbon on the performance of ni-based catalysts in methane dry reforming, Catalysts, 10.3390/catal10010021, 10, 1, 2020.01, This study aimed to investigate the effect of carbon derived from glucose (C) on the physicochemical characteristics and catalytic activity of Ni, supported over SiO , ZSM-5, and TiO in methane dry reforming. Among the Ni catalysts without C, Ni/SiO exhibited the highest CH -CO conversion and stability at all experimented temperatures. On the other hand, the C-incorporated catalysts prepared by glucose impregnation, followed by pyrolysis, showed dissimilar performances. C improved the stability of Ni/SiO in the reforming at 650 C and 750 C and increased the CH and CO conversion to the level close to the thermodynamic equilibrium at 850 C. However, this element did not substantially affect the activity of Ni/ZSM-5 and exerted a retarding effect on Ni/TiO . Characterizations with H -TPD, XRD, EXAFS, and STEM-EDS revealed that the different influences of C by the supports were attributed to the extent of metal dispersion and metal-support interaction. 2 2 2 4 2 2 4 2 2 2 ◦ ◦ ◦. |
| 35. | KUDO Shinji, OKADA Jun, IKEDA Shiho, YOSHIDA Takuya, ASANO Shusaku, HAYASHI Jun-ichiro, Improvement of Pelletability of Woody Biomass by Torrefaction under Pressurized Steam, Energy & Fuels, 10.1021/acs.energyfuels.9b02939, 33, 11, 11253-11262, 2019.12, [URL]. |
| 36. | Li Chen, Rei Nakamoto, Shinji Kudo, Shusaku Asano, Jun ichiro Hayashi, Biochar-Assisted Water Electrolysis, Energy and Fuels, 10.1021/acs.energyfuels.9b02925, 33, 11, 11246-11252, 2019.11, This study has experimentally proven an approach to integrate electric energy and chemical energy of biomass into chemical energy of hydrogen by biochar-assisted water electrolysis (BAWE). This type of electrolysis, in other words, electrochemical gasification, consists of hydrogen formation at the cathode and biochar oxidation at the anode, instead of O formation. Different from traditional gasification of biochar, BAWE is operated at a temperature below 100 °C and normal pressure. Linear sweep voltammetry showed that the electrolysis of acidified water, when suspended with biochar, occurred at an interelectrode potential as low as 0.5 V, which was much smaller than 1.23 V, the standard potential to split water into hydrogen and oxygen at 25 °C. The performance of biochar depended significantly upon the carbonization temperature for its preparation. It was found that 850 °C was the best carbonization temperature that provided an optimum combination of specific surface area and carbon-type distribution. It was revealed by continuous BAWE that the formation of O-containing functional groups on the biochar surface was predominant over CO formation at the anode, while H was formed obeying stoichiometry at the cathode. Accumulation of the O-containing groups on the biochar surface decreased its electrochemical reactivity, slowing the electrolysis. Thermal treatment at 850 °C removed the major portion of O-containing groups from the spent biochar, fully recuperating its electrochemical reactivity. CO gasification enhanced the biochar activity, and its effect went far beyond the heat treatment. On the basis of the above-mentioned characteristics of BAWE, its combination with CO gasification as the biochar recuperator as well as syngas producer is proposed. 2 2 2 2 2. |
| 37. | Kota Inohara, Shusaku Asano, Taisuke Maki, Kazuhiro Mae, Synthesis of Small Lipid Nanoparticles Using an Inkjet Mixing System Aiming to Reduce Drug Loss, Chemical Engineering and Technology, 10.1002/ceat.201900041, 42, 10, 2061-2066, 2019.10, An inkjet mixing system was investigated to synthesize lipid nanoparticles (LNP) by mixing lipid ethanol and aqueous saline solutions. The system was employed to help minimize drug loss. The quick mixing of the droplets enabled the synthesis of small LNP while reducing the excess amount of saline solution that would contain drugs. The system also features minimal usage of reagents. A high relative velocity of the droplets and moderate values of the impact parameter were necessary for successful mixing. Faster droplets should collide with the upper or horizontal level of slower droplets to promote mixing. A horizontal spin of the coalesced droplets was favored rather than a vertical spin.. |
| 38. | Shusaku Asano, Cheolyong Choi, Kentaro Ishiyama, Shinji Kudo, Xiangpeng Gao, Jun-ichiro Hayashi, Re-examination of Thermogravimetric Kinetic Analysis of Lignite Char Gasification, Energy & Fuels, 10.1021/acs.energyfuels.9b02946, 33, 11, 10913-10922, 2019.10. |
| 39. | Shusaku Asano, Shota Yatabe, Taisuke Maki, Kazuhiro Mae, Numerical and Experimental Quantification of the Performance of Microreactors for Scaling-up Fast Chemical Reactions, Organic Process Research and Development, 10.1021/acs.oprd.8b00356, 23, 5, 807-817, 2019.05, Microreactors have been utilized for controlling fast chemical reactions. However, the scale-up strategy for fast reactions is not established enough due to the difficulty in quantifying the effect of the reactor size on the mixing performance, heat removal, and observable reaction rate. We present a chart for analyzing the effect of the mixing rate on the observable kinetic constant and a chart for estimating the temperature increase in the reactor. By using these charts, the validity of the rate analysis and the maximum reactor diameter, which control the reaction temperature, were determined. Commercial computational fluid dynamics (CFD) software was employed to solve the partial differential equations and to build the charts, and experiments were conducted to validate the results. We demonstrated the concept by using the ultrafast organolithium reaction in milliseconds. The product throughput was increased eight times with a reactor diameter that was twice as wide as the original reactor.. |
| 40. | Shusaku Asano, Taisuke Maki, Victor Sebastian, Klavs F. Jensen, Kazuhiro Mae, Revealing the Formation Mechanism of Alloyed Pd–Ru Nanoparticles: A Conversion Measurement Approach Utilizing a Microflow Reactor, Langmuir, 10.1021/acs.langmuir.8b03516, 35, 6, 2236-2243, 2019.01. |
| 41. | S. Asano, S. Yamada, T. Maki, Y. Muranaka, K. Mae, Design protocol of microjet mixers for achieving desirable mixing times with arbitrary flow rate ratios, Reaction Chemistry and Engineering, 10.1039/c7re00051k, 2, 6, 830-841, 2017.12, We extensively examined and discussed the performance of microjet mixers that consisted of two concentrically arranged tubes. The orientation of the feed streams with respect to the inner and outer inlets was the crucial factor for promoting the desired reaction. The Reynolds number after jetting and the velocity ratio of the inner and outer fluids were the key variables for promoting vigorous jetting and efficient mixing. By choosing the appropriate operating conditions, the microjet mixers exhibited excellent performance. The design protocol for microjet mixers was established based on mixing time measurements. We successfully maximized the throughput in one channel and numbered-up the microjet mixers. The microjet mixers also proved to be useful for treating viscous fluids with the appropriate choice of the feed orientation. The complete mixing of water with a 200 times more viscous fluid was achieved in 20 ms.. |
| 42. | Shusaku Asano, Taisuke Maki, Ryutaro Nakayama, Ryuji Utsunomiya, Yosuke Muranaka, Toshiharu Kuboyama, Kazuhiro Mae, Precise analysis and control of polymerization kinetics using a micro flow reactor, Chemical Engineering and Processing: Process Intensification, 10.1016/j.cep.2017.05.016, 119, 73-80, 2017.09. |
| 43. | Shusaku Asano, Taisuke Maki, Kazuhiro Mae, Evaluation of mixing profiles for a new micromixer design strategy, AIChE Journal, 10.1002/aic.15082, 62, 4, 1154-1161, 2016.04, The relationship between mixing history and reaction performance in microreactors using computational fluid dynamics (CFD) simulations is identified. In the idealized, simplified mixing model, mixing proceeds linearly and only the mixing time determined the reaction performance. However, in the case of realistic models where mixing proceeds unequally, the partial rapid progression of mixing, more than the mixing time, significantly impacts the reaction. The use of the fluid segment size distribution to capture this effect is proposed. The effective Damköhler number derived from the fluid segment size distribution predicted the reaction yield well. To demonstrate the utility of the mixing profile design strategy, we fabricated a novel micromixer with multiple partial rapid mixing zones. This micromixer achieved excellent results both in a CFD simulation and an experiment.. |
本データベースの内容を無断転載することを禁止します。