研究等業績 - その他 - 大川　浩一

Elution behavior of mercury in desulfurization gypsum produced in a coal-fired power plant

Linda Ernesto Uaciquete D.

Fuel ( Fuel )  334   2023年02月

DOI

Changes in the sulfur forms of subbituminous coals during oxidation with hydrogen peroxide and peracetic acid

Kato T.

Fuel ( Fuel )  330   2022年12月

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Synthesis of porous γ-Fe<inf>2</inf>O<inf>3</inf>from scorodite synthesized using ultrasound irradiation and evaluation of its battery performance

Kitamura Y.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics )  61 ( SG ) SG1056 - SG1056   2022年07月

Abstract

The effect of 200 kHz ultrasound on scorodite synthesis at 70 °C and 3 h reaction conditions was investigated using sulfuric acidic solutions of various pH (3.0, 2.0, 1.5, 1.0, and 0.0). In contrast to the case of only O₂ gas flow without ultrasound irradiation, oxidizing radicals generated by ultrasound irradiation promote Fe(II) oxidation in solution and precursor, allowing scorodite to synthesize with high crystallinity (&gt;99%), which relates to low solubility, even in strong acid solution at pH 1.0. During synthesis, the particle shape was decided to be polyhedral or spindle type depending on the pH of 0.0–3.0. The spindle-shaped scorodite was probably formed by the reduction in precursor amount produced during the initial stage of synthesis. Furthermore, porous maghemite obtained by alkali treatment of scorodite showed initial discharge capacities of 146 mAh g⁻¹ (polyhedron) and 167 mAh g⁻¹ (spindle), indicating that its potential use as a cathode material for lithium-ion batteries.

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Extraction and oxidative desulfurization of bitumen from oil sand using n-pentane and ultrasound

Wakisaka Y.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics )  61 ( SG )   2022年07月

DOI

Adsorption of an Anionic Surfactant (Sodium Dodecyl Sulfate) from an Aqueous Solution by Modified Cellulose with Quaternary Ammonium

Zou M.

Polymers ( Polymers )  14 ( 7 )   2022年04月

DOI

1-07　石炭火力発電所由来脱硫石膏に含まれる水銀の溶出挙動

ウアシケテ ドルカス リンダ エルネスト, 加藤 貴宏, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  58 ( 0 ) 14 - 15   2021年10月

DOI CiNii Research

2-21　CCA処理木材の熱処理における有害元素の放出挙動

加藤 貴宏, 畠山 健, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  58 ( 0 ) 64 - 65   2021年10月

DOI CiNii Research

2-12　使用済み脱硝触媒中のリンの除去

加藤 貴宏, 作左部 皓輔, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  57 ( 0 ) 42 - 43   2020年10月

DOI CiNii Research

1-6　イオン液体を用いた石炭抽出物からの硫黄および窒素の除去

小野寺 凱, 加藤 貴宏, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  56 ( 0 ) 12 - 13   2019年10月

DOI CiNii Research

1-9　未燃炭素に含まれる水銀の形態分析

作左部 皓輔, 豊島 菜々子, 加藤 貴宏, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  56 ( 0 ) 18 - 19   2019年10月

DOI CiNii Research

E-wasteからの貴金属の効率的回収プロセスの開発

Sakusabe Kosuke, Kato Takahiro, Okawa Hirokazu, Sugawara Katsuyasu

Journal of the Society of Powder Technology, Japan ( Journal of the Society of Powder Technology, Japan )  56 ( 3 ) 130 - 135   2019年03月

国内共著

<p>A separation and recovery process of precious metals from E-waste was developed using chlorination. Release behaviors of metal elements from incinerated ash of spent printed circuit board were followed during the heat treatment under a chlorine gas stream. Capturing behaviors of volatilized chlorides were also followed when the chloride gases were supplied to the bed of carbon particles. Rate analysis was conducted for the release and capturing behavior of precious metals obtained by changing the treatment temperature and residence time. Gold and silver in the ash was completely released when heated for 1 hour at 1000°C. The total amounts of released gold and silver from incinerated ash were successfully recovered by adjusting the thickness of the bed of carbon particles at 800°C. The rate analysis for the release and capturing indicated that gold showed lower activation energies for both release and capturing reactions than those of silver.</p>

DOI

超音波と塩化カルシウムを用いたモノエタノールアミン溶液からの二酸化炭素の脱離

藤原 達央, 大川 浩一, 加藤 貴宏, 菅原 勝康

日本鉱業会誌 ( 一般社団法人 資源・素材学会 )  135 ( 1 ) 1 - 7   2019年01月

国内共著

<p>This study investigated an effective method to desorb CO₂ from low-concentration (0.2 mol/L) monoethanolamine (MEA) solutions using calcium chloride (CaCl₂) and ultrasound irradiation at 25 ºC. The pH value of the solution had a large influence on the desorption ratio of CO₂ from MEA solution under ultrasound irradiation. CO₂ was successfully desorbed up to pH8.2, and it was impossible to desorb CO₂ at pH over 8.2. It was clarified that CO₂ desorption by ultrasound irradiation is useful for the concentration of MEA solution of up to 2.0 mol/L, because the pH rises above 8.2 when the concentration of MEA solution is increased to above 2.0 mol/L. It also became evident that the addition of small amount of CaCl₂ further increases the amount of CO₂ desorbed during ultrasound irradiation.</p>

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Utilization of layered double hydroxide to remove arsenic and suppress pH decrement during ultrasound oxidation of arsenious acid

Tanaka, Y., Okawa, H., Takahashi, Y., Kato, T., Sugawara, K.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics )  57 ( 7 )   2018年07月

国内共著

DOI

No.1-13 石炭火力発電副産物中の水銀の存在形態

作左部 皓輔, 加藤 貴宏, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  55 ( 0 ) 26 - 27   2018年

国内共著

<p>Mercury forms in fly ash and desulfurization gypsum produced from the coal-fired power plant were analyzed. A combination of temperature programmed desorption (TPD) and cold vapor atomic absorption spectrometry (CVAAS) was applied and the optimum operating condition was determined to clarify the forms of mercury. TPD curves of mercury obtained for the ash and gypsum were analyzed qualitatively and quantitatively with comparing to the peak temperature and linear combination of TPD curves of model mercury compounds. The results indicated that mercury in the desulfurization gypsum was mainly composed of HgCl2 and the adsorbed one by unburned carbon.</p>

DOI

No.1-4 Utilization of activated carbon prepared from Mozambican coal for heavy metals adsorption

UACIQUETE Dorcas L. E., KATO Takahiro, OKAWA Hirokazu, SUGAWARA Katsuyasu

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  55 ( 0 ) 8 - 9   2018年

<p>Activated carbon was prepared from high ash Mozambican coal by chemical activation through K₂CO₃ impregnation and later tested for adsorption of heavy metals from aqueous solution. The effect of activation temperature, impregnation ratio on BET surface area, pore size and pore volume were discussed. It was observed that the activated carbon prepared at a reaction temperature of 800 °C and impregnation ratio of 1:1, showed larger specific surface area of 895 m²/g and pore volume of about 0.4 cm³/g. The capacity to remove zinc, and chromium from aqueous solution was tested by batch experiments carried out at room temperature in 100 mL Erlenmeyer flasks. The adsorption percentage of Zn was satisfactory, reaching about 97.8% at contact time of 1 hour while for Cr the percentage of adsorption was lower, attaining only 10.8% at the end of 1hour experiment.</p>

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No.1-9 石炭抽出物に含まれる有機硫黄の除去

小野寺 凱, 加藤 貴宏, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  55 ( 0 ) 18 - 19   2018年

国内共著

<p>In a series of studies on development of an advanced desulfurization process of heavy hydrocarbon resources under mild conditions without pressurized hydrogen and catalyst, removal behavior of organic sulfur was investigated for a coal extract by using sulfur free imidazolium type ionic liquid. Sulfur removal progressed with increasing number of extraction step and 87% of sulfur removal was achieved after the fifth treatment. The coal extract could be recovered at high yields from the ionic liquid phase by back extraction with 1-methylnaphthalene.</p>

DOI

Selective recovery of gold from secondary resources

Sugawara K.

23rd International Congress of Chemical and Process Engineering, CHISA 2018 and 21st Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2018 ( 23rd International Congress of Chemical and Process Engineering, CHISA 2018 and 21st Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2018 )  1   2018年

石炭の液相酸化における硫黄の挙動

加藤 貴宏, 永井 裕樹, 大川 浩一, 菅原 勝康

日本エネルギー学会誌 ( 一般社団法人 日本エネルギー学会 )  97 ( 4 ) 88 - 96   2018年

<p>石炭中の無機および有機硫黄を穏和な条件下で効率的に事前脱硫する技術を開発するため，炭化度が異なる５種類の石炭について過酸化水素による酸化脱硫を行った。室温にて石炭試料を過酸化水素中で2 h撹拌すると，無機硫黄の黄鉄鉱硫黄と硫酸塩硫黄が固相から完全に除去された。有機硫黄も同時に除去され，例えば低炭化度の褐炭では84％の有機硫黄が除去された。固相から除去された硫黄は硫酸塩として過酸化水素水溶液に溶解した。石炭中のチオフェン型硫黄は，過酸化水素処理の間にスルフォキシドとスルフォンに変わることがXANES分析により明らかとなった。チオフェンの除去率は石炭化度が高い石炭ほど低く，原炭の芳香族炭素指数との間に明確な相関があることが確認された。</p>

DOI

Ultrasound-assisted Oxidative desulfurization of bitumen

Kamal W.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics )  56 ( 7 )   2017年07月

Bitumen contains a high percentage of sulfur (about 4.6 wt %). A hydrodesulfurization method is used to remove sulfur from bitumen. The drawback of this method is the requirement for a high temperature of &gt;300 degrees C. Most of the sulfur in bitumen exists as thiophene. Oxidative desulfurization (ODS), involving oxidizing sulfur using H2O2, then removing it using NaOH, allows the removal of sulfur in thiophene at low temperatures. We removed sulfur from bitumen using ODS treatment under ultrasound irradiation, and 52% of sulfur was successfully removed. Additionally, the physical action of ultrasound assisted the desulfurization of bitumen, even at low H2O2 concentrations. (C) 2017 The Japan Society of Applied Physics

DOI

Utilization of ultrasonic atomization for dust control in underground mining

Okawa H.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics )  56 ( 7 )   2017年07月

This study examined dust suppression using water particles generated by ultrasonic atomization (2.4 MHz) at low temperature (10 degrees C). Green tuff (4 mu m), green tuff (6 mu m), kaolin, and silica were used as dust samples. Even though ultrasonic atomization makes fine water particles, raising relative air humidity immediately was difficult at low temperature. However, remaining water particles that did not change to water vapor contributed to suppression of dust dispersion. Additionally, the effect of water vapor amount (absolute humidity) and water particles generated by ultrasonic atomization on the amount of dust dispersion was investigated using experimental data at temperatures of 10, 20, and 30 degrees C. Utilization of ultrasound atomization at low temperature has the advantages of low humidity increments in the working space and water particles remaining stable even with low relative air humidity. (C) 2017 The Japan Society of Applied Physics.

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No.1-11 過酸化水素と無水酢酸を用いたハイパーコールの酸化脱硫

小野寺 凱, 加藤 貴宏, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  54 ( 0 ) 22 - 23   2017年

<p>To develop a mild chemical desulfurization method without residual chemicals in the treated Hyper-coal, desulfurization behavior was investigated by oxidation using hydrogen peroxide and acetic anhydride at room temperature and by pyrolyzing the treated sample under nitrogen stream. XANES analysis showed that the Hyper-coal contained only thiophenic sulfur and that the thiophenic sulfur changed to sulfone during the oxidation treatment. High removal extent of sulfur with high char yield was achieved by pyrolyzing the oxidized sample prepared at room temperature for 24 hour.</p>

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No.1-12 石炭の溶剤抽出における硫黄の分配挙動

田村 真実, 加藤 貴宏, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  54 ( 0 ) 24 - 25   2017年

<p>In a series of studies on the development of coal utilization process with pre-desulfurization, three types of coal were extracted by 1-methylnapthalene and sulfur distribution from raw coals to products (Soluble, Residue and Deposit) was clarified. XANES analysis indicated that most of pyritic sulfur was distributed to Residue. Soluble contained no inorganic sulfur. Every Soluble obtained from three types of coal contained organic sulfur, especially thiophenic sulfur only. Thiophenic sulfur content in Soluble decreased linearly with the increase of the steps of extraction using an ionic liquid of imidazolium type.</p>

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No.1-13 オイルサンドからのビチューメン回収過程における脱硫処理の検討

赤沢 伸幸, 大川 浩一, Kamal Wan Mohamad Ikhwan Bin Wan, 加藤 貴宏, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  54 ( 0 ) 26 - 27   2017年

<p>Desulfurization of bitumen was performed by combination of oxidative desulfurization (ODS) and ultrasound irradiation. Tetrahydrofuran (THF) was employed as solvent to emulsify the bitumen and improve the desulfurization ratio. In the result, the desulfurization ratio reached to 82.7% (ion-exchange water: 52%). We also investigated simultaneous recovery and desulfurization of bitumen from oil sand using ODS and ultrasound. Recovery ratio of bitumen from oil sand was 68.1% and the purity of recovered bitumen was 72.3%.</p>

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No.1-15 使用済み脱硝触媒からのレアメタルの分離回収

作左部 皓輔, 加藤 貴宏, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  54 ( 0 ) 30 - 31   2017年

<p>Selective recovery process of titanium, vanadium and tungsten has been developed for the spent denitrification catalyst produced from coal fired plant. Volatilization behaviors of the rare metals were followed in a chlorine gas stream with the addition of carbon as a reducing agent. Methanol vapor was supplied to a fixed bed of catalyst at 400 °C and fine carbon was deposited on the surface of catalyst. The volatilization rates of the rare metals ware enhanced drastically with the use of the deposited carbon compared to pyrolytic carbon prepared from phenolphthalein. The rare metals in the catalyst could be recovered selectively at 400 °C without silicon, iron and aluminum when the deposited carbon of 20 wt% was used.</p>

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No.1-7 Characteristics and Self-heating Behavior of Moatize Coals, Moatize Coal Basin, Mozambique

UACIQUETE Dorcas L. E., KATO Takahiro, OKAWA Hirokazu, SUGAWARA Katsuyasu

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  54 ( 0 ) 14 - 15   2017年

<p>Mozambique has a great potential in terms of coal deposits, the most important is Moatize Coal Basin (MCB) located in Tete Province, Moatize district. The MCB has estimates reserves of about 2.5 billion tons, with thick coal seams allowing the open-pit exploitation. It is well known throughout the world that Moatize basin is a world class deposit for coking and thermal. However, recently, occurrences of spontaneous combustion are being resisted in both in situ coal seams and stockpiles of washed products (coking coal and thermal coal). Spontaneous combustion is a direct result of self-heating and it is a global issue affecting environment, economy and human health.</p><p>In this study, petrographic and chemical properties of samples of raw coal (<i>in situ layers</i>), coking coal and thermal coal were studied using image analysis through oil immersion microscopy and elemental and proximate analyzers (CHN, CS and TGA-DTA) respectively, to predict the propensity of self-heating. The microscopic characterization revealed important features such as changes in vitrinite reflectance, oxidation rims, micropores and cracks mainly on in situ coal and some signs of weathering and oxidation on thermal coal which are related to their reactivity and potential to self-heating leading later to spontaneous combustion</p>

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No.2-15 炭素還元による脱硝触媒からの砒素の除去

加藤 貴宏, 佐藤 起子, 大川 浩一, 菅原 勝康

石炭科学会議発表論文集 ( 一般社団法人 日本エネルギー学会 )  54 ( 0 ) 80 - 81   2017年

<p>Decreasing of activity of the denitration catalyst caused by arsenic adsorption is one of the big problems against the stable long term operation of the coal power plant. In order to remove arsenic from the catalyst by conversion of As₂O₅ to volatile As₂O₃, methanol was used as the carbon source for the reduction. Effects of treatment temperature, reaction time and partial pressure of methanol on changes in the removal extent of arsenic, the chemical forms of vanadium and the denitration activity were investigated.</p>

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