研究者詳細 - 則永　行庸

Energy-saving CO<inf>2</inf> Capture Process Using Phase Separation Type Solvent by Aqueous (amine + ether) Solution 査読有り

Machida H., Takehiro E., Yamaguchi T., Norinaga K., Kishimoto A., Akiyama K., Nishimura M.

GHGT 2018 - 14th International Conference on Greenhouse Gas Control Technologies 2018年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：GHGT 2018 - 14th International Conference on Greenhouse Gas Control Technologies

We have developed the phase separation solvent for CO2 capture. Our developed solvent consists amine, organic solvent and water and shows single liquid phase before CO2 absorption though it shows two liquid phases after CO2 absorption. Feature of phase separation solvent is reducing temperature difference between absorber and stripper. We apply the heat pump system for CO2 separation and evaluate the energy consumption. Low temperature swing process saves energy requirement for CO2 capture process with highly-effective reaction-heat recovering. To evaluate the CO2 capture system with our solvent, screening test for amine and organic solvent combination and CO2 solubility measurement were examined. In the phase separation test, three types of solvents were obtained by combining amine and ether, that is, no phase separation with CO2 scrubbing, phase separation with CO2 scrubbing, and thoroughly immiscible. The phase behaviour depends on the hydrophobicity of amines or organic solvents, and the types of solvents were classified using the hydrophobic parameter.

Current situation and future scope of biomass gasification in Japan

Furutani Y., Norinaga K., Kudo S., Hayashi J.I., Watanabe T.

Evergreen 4 巻 ( 4 ) 頁： 24 - 29 2017年12月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Evergreen

In this study, we investigated current situation of biomass gasification plants in 5 cities (c.a. Murayama City, Chichibu City, Ueno Village, Oshu City and Yamaguchi City) in Japan, and make R&D policy proposals to expand the biomass gasification plants. Four cities have commonly promoted the efficient heat utilization such as snow melting, drying the wood and supplying hot water into mushroom bed and hot spring. However, heat utilization is limited in a small area because heat loss is generated during the long-distance transportation. In order to obtain energy forms suitable for the long-distance transportation, such as hydrogen gas and electricity, the R&D of biomass gasification with hydrogen production or combined with Solid Oxide Fuel Cell (SOFC) should be promoted in the future.

DOI： 10.5109/1929681

CiNii Research

7-2-4 相分離型CO2吸収剤による省エネルギーCO2分離技術開発査読有り

町田洋, 江崎丈裕, 山口毅, 堀添浩俊, 則永行庸, 岸本啓, 松岡亮, 秋山勝哉, 西村真

日本エネルギー学会大会講演要旨集 26 巻 ( 0 ) 頁： 228 - 229 2017年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人日本エネルギー学会

Phase separation type CO2 capture solvent was developed which transforms into two liquid phases after CO2 absorption. At first, we checked the phase phenomena of 9 types of amine and 3 types of polyether combinations. There shows three types; keeping one liquid phase before and after CO2 absorption, transforming into two liquid phase after CO2 absorption, forming initially two liquid phases. CO2 solubility of the developed phase separation solvent was measured. The results show that the phase separation solvent can reduce the temperature difference between absorber and desorber than that of conventional amine solvent. Required energy for CO2 capture using phase separation solvent was estimated under 2.0 GJ/ton-CO2.

DOI： 10.20550/jietaikaiyoushi.26.0_228

CiNii Research

A Supported Ni Catalyst Produced from Ni-Al Hydrotalcite-Like Precursor for Reduction of Furfuryl Alcohol to Tetrahydrofurfuryl Alcohol by NaBH4 in Water 査読有り

P-3-3 初期熱分解及び二次気相分解の素反応モデル連成によるリグニン急速熱分解生成物組成の予測査読有り

古谷優樹, 堂原裕騎, 工藤真二, 林潤一郎, 則永行庸

日本エネルギー学会大会講演要旨集 26 巻 ( 0 ) 頁： 268 - 269 2017年

Ren, DZ; Wang, JY; Jiang, XL; Song, ZY; Norinaga, K; Huo, ZB

CHEMISTRYSELECT 6 巻 ( 4 ) 頁： 551 - 556 2021年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ChemistrySelect

Tetrahydrofurfuryl alcohol (THFA) is a kind of high value-added compound in industry, which can be obtained from biomass chemical engineering. However, Synthesis of THFA under mild condition with green hydrogen donors remains a big challenge. In this article, a supported Ni catalyst derived from Ni−Al hydrotalcite-like compounds (HTs) as precursors for the reduction of furfuryl alcohol (FA) into THFA with NaBH4 as reducing agent in water was first reported. As a result, Ni/Al2O3−HT exhibited high catalytic activity for the transformation, and THFA was achieved in 100 % yield at 60 °C for 60 min. Moreover, Ni/Al2O3−HT could be recycled at least seven times without the loss of its activity. Under optimized conditions, the reduction reaction of several furan and ketone compounds was investigated. A possible mechanism for the reduction of FA to afford THFA was also proposed.

DOI： 10.1002/slct.202003543

Lattice Boltzmann simulation of multicomponent reaction-diffusion and coke formation in a catalyst with hierarchical pore structure for dry reforming of methane 査読有り

Lin, YX; Yang, C; Choi, CY; Zhang, W; Machida, H; Norinaga, K

CHEMICAL ENGINEERING SCIENCE 229 巻 2021年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Chemical Engineering Science

In order to further enhance catalytic activity and inhibit carbon formation, the hierarchical structure-performance relationship has been investigated in dry reforming of methane (DRM). A modified random generation of macro-mesopores (RGMMP) algorithm was adopted to model the structure of the catalyst with macropore and mesopore. Based on multi-component non-continuum reaction-diffusion lattice Boltzmann model, the effects of three hierarchical pore geometrical parameters, namely the catalyst porosity, the ratio of mesopore volume to macropore volume and the ratio of average macropore diameter to average mesopore diameter, on coke formation and catalytic performance were investigated to elucidate the deactivation and reaction-diffusion mechanism of the catalyst in DRM. Based on the competitive relationship between heterogeneous reaction and intraparticle diffusion, the optimal values to define hierarchical pore structure have been identified, which provides maximum catalytic performance and coking resistance for a reaction condition.

DOI： 10.1016/j.ces.2020.116105

Prediction of Phase Behavior of CO2 Absorbents Using Conductor-like Screening Model for Real Solvents (COSMO-RS): An Approach to Identify Phase Separation Solvents of Amine/Ether/Water Systems upon CO2 Absorption 査読有り

Nakaoka, M; Tran, KVB; Yanase, K; Machida, H; Norinaga, K

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 59 巻 ( 42 ) 頁： 19020 - 19029 2020年10月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Industrial and Engineering Chemistry Research

Developing energy-saving absorbents for carbon dioxide (CO2) is essential for improving carbon capture and storage (CCS) technologies. Recently, we have designed phase separation solvents, which can significantly reduce the regeneration energy for CO2 capture and separation down to 1.6 GJ/ton-CO2 [ Machida, H.; et al. Int. J. Greenhouse Gas Control2018, 75, 1-7 ]. For further developing better solvents, this paper studied a theoretical approach with conductor-like screening model for real solvents (COSMO-RS) to screen the amine/ether/water systems to identify phase separation solvents upon CO2 absorption. In this work, liquid-liquid equilibria of 21 amine/ether/water systems were determined both before and after CO2 absorption. Experimentally, it has already been demonstrated that the phase behavior of these systems is classified into three categories: phase separation type, miscible type, and immiscible type. This study demonstrates that the octanol/water partition coefficient is empirically able to search for a combination of amine and ether compounds, in which the system exhibits the phase separation behavior by absorbing CO2. The COSMO-RS calculations successfully reproduced experimental phase behavior with a rate of agreement of more than 80% by accounting the following two factors: (i) ion pairing for the description of the association/dissociation state for ionic species and (ii) relevant low-lying conformations of ether and amine, which are rationalized by experiments such as conductivity and excess enthalpy measurements. Moreover, we also validated the ability of the COSMO-RS calculation to qualitatively describe the compositions of 2-(ethylamino)ethanol, diethylene glycol diethyl ether, and water in CO2-rich and CO2-lean phases at varying CO2 loading conditions.

DOI： 10.1021/acs.iecr.0c03233

Energy-Saving CO2 Capture by H2 Gas Stripping for Integrating CO2 Separation and Conversion Processes 査読有り

水素を用いた省エネルギー CO₂ 回収技術招待有り

町田洋，柳瀬慶一，チャンクウィン，山口毅，則永行庸

クリーンエネルギー 29 巻 ( 10 ) 頁： 17 - 22 2020年10月

水素を用いた省エネルギー CO₂ 回収技術招待有り査読有り

町田洋, 柳瀬慶一, チャンクウィン, 山口毅, 則永行庸

クリーンエネルギー 29 巻 ( 10 ) 頁： 17 - 22 2020年10月

メタネーション大規模実証に向けた基盤研究およびCO2分離回収と利用の統合プロセスに関する研究開発招待有り

則永行庸、張煒、チェチョルヨン、柳瀬慶一、チャンクウィン、町田洋

Adsorption News 34 巻 ( 2 ) 頁： 18 - 22 2020年7月

メタネーション大規模実証に向けた基盤研究およびCO2分離回収と利用の統合プロセスに関する研究開発招待有り査読有り

則永行庸, 張煒, チェチョルヨン, 柳瀬慶一, チャンクウィン, 町田洋

Adsorption News 34 巻 ( 2 ) 頁： 18 - 22 2020年7月

Machida, H; Esaki, T; Yamaguchi, T; Norinaga, K

ACS SUSTAINABLE CHEMISTRY & ENGINEERING 8 巻 ( 23 ) 頁： 8732 - 8740 2020年6月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS Sustainable Chemistry and Engineering

CO2 capture and utilization technology, such as converting CO2 to fuel or chemicals by renewable energy-derived H2, has been promoted for recent decades. Herein, a process is proposed that saves considerable amounts of energy by integrating the CO2 separation and conversion processes. In the case of the method of amine absorption, supplying H2 to the bottom of the desorber reduces the regeneration temperature, which can reduce the process exergy. If combined with reaction heat recovery using a heat pump system, a considerable amount of energy can be saved. The recovered mixture of CO2 and H2 gas is then used directly as a raw reaction material. Herein, the proposed stripping regeneration process is compared on theoretical and equilibrium bases, with the conventional monoethanolamine method and the phase-separation solvent method developed by the authors. Using the phase-separation solvent leads to lower energy in the stripping regeneration.

DOI： 10.1021/acssuschemeng.0c02459

Carbon Dioxide Absorption Heat in Liquid-Liquid and Solid-Liquid Phase-Change Solvents Using Continuous Calorimetry 査読有り

Tran, KVB; Ando, R; Yamaguchi, T; Machida, H; Norinaga, K

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 59 巻 ( 8 ) 頁： 3475 - 3484 2020年2月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Industrial and Engineering Chemistry Research

For three groups of systems - homogeneous, liquid-liquid, and solid-liquid - absorption heats of carbon dioxide capture by amine solutions were determined with continuous calorimetry. In the case of a phase-separation solvent, the heat of phase separation is added to conventional absorption heat, and the loading range of heat of phase separation is important in process design. With the merits of continuous measurement, the phase-change loading points were obtained in liquid-liquid and solid-liquid phase-separation systems as the heat release of carbon dioxide products to achieve a more stable state. The loading points where a leap in absorption heat appears coincide with those where the turbidity in solvents changes, which was confirmed by ocular inspection in both systems. In liquid-liquid systems, the presence of water in 2-(ethylamino)ethanol:diethylene glycol diethyl ether:water contributes to the decrease in absorption heat. Even though the formation of bicarbonate is minor even in solvent with water, the increase in its formation contributes to this decrease in absorption heat because of its lower formation heat as compared to that of carbamate. In solid-liquid systems, a significant increase in absorption heat is attributed to the crystallization energy of carbonate salt emitted on the breakdown of the supersaturation.

DOI： 10.1021/acs.iecr.9b04672

Computational fluid dynamics simulation of CO2 methanation in a shell-and-tube reactor with multi-region conjugate heat transfer 査読有り

Zhang, W; Machida, H; Takano, H; Izumiya, K; Norinaga, K

CHEMICAL ENGINEERING SCIENCE 211 巻 2020年1月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Chemical Engineering Science

Methanation is one of the promising candidates in developing CO2 utilization technology. Because of its exothermic behavior, the methanation reactor must be carefully designed to avoid the hotspots formation and the deterioration of catalysts. This study presents a numerical study simulates heat transfer between the reacting gas in a porous catalyst layer, reactor tube, and coolant in a shell-and-tube reactor. The aim is to develop a tool can predict the hotspots appearing in the reactor used in CO2 methanation. The open-source toolbox OpenFOAM is adopted and modified. The catalyst bed is assumed to be a continuous porous medium. The results revealed that the solver captures the trends of temperature profiles along both axial and radial directions. The maximum catalyst temperature predicted by this solver is in good agreement with the experimental result, indicating that the solver is a promising tool for future applications in reactor optimization and heat management.

DOI： 10.1016/j.ces.2019.115276

Modelling of CO<inf>2</inf> solubility in phase separation solvent composed of amine/ether/water system for CO<inf>2</inf> capture 査読有り

Machida, H., Ando, R., Esaki, T., Yamaguchi, T., Norinaga, K.

Journal of Molecular Liquids 292 巻 2019年10月

Quantitative Description of Catalysis of Inherent Metallic Species in Lignite Char during CO2 Gasification 査読有り

Halim, N; Ashik, UPM; Gao, XP; Kudo, S; Sanwani, E; Norinaga, K; Hayashi, J

ENERGY & FUELS 33 巻 ( 7 ) 頁： 5996 - 6007 2019年7月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Energy and Fuels

Chars from 20 lignite samples were prepared from two types of original lignites by multistage removal of inherent metallic species and subsequent pyrolysis and then were gasified with CO2. A kinetic model, which assumed the progress of noncatalytic and catalytic gasification in parallel, quantitatively described the time-dependent changes in char conversion up to 0.999 for all the chars by employing multicatalytic species having different initial activities and deactivation kinetics. A single piecewise linear function, which followed a nucleation-growth mechanism of the catalysts, showed the relationship between the total concentration of Na, K, Ca, and Fe and the initial total catalytic activity (ICA-2) for the chars. The overall rate of catalyst deactivation (ICD-2) was given by a single linear function of ICA-2 and a factor for the composition of metallic species. This function was also applicable to previously reported ICA-2/ICD-2 relationships for chars from lignite and biomass, showing fast deactivation of Fe catalyst and an important role of Mg in the promotion of catalyst deactivation.

DOI： 10.1021/acs.energyfuels.9b00465