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Moriyasu Nonaka Last modified date:2017.07.10

Assistant Professor / Resources System Engineering
Department of Earth Resources Engineering
Faculty of Engineering

Graduate School
Undergraduate School

Academic Degree
Field of Specialization
Mineral Processing
Outline Activities
Low rank coal, which has not been fully utilized, makes up half of the known deposits.
Biomass is considered to be carbon-neutral and cultivated vastly in tropic plantations. Peat is present in vast swamps in tropical rainforests. We have focused our efforts on these low-grade carbonaceous materials to upgrade them, extract value-added chemicals from them, and reform them for CO2 gasification, by using hydrothermal treatment.
Research Interests
  • effective utilization of low quality carbonaceous materials by hydrothermal treatment
    keyword : Biomass, Low rank coal, hydrothermal treatment
    2006.04Recently, fossil fuel consumption has caused a rise in the atmospheric level of CO2 that is considered to be the main cause of global warming. The reduction of greenhouse gas emission has recently been a global concern for the continuous prosperity. Renewable resources of energy attract attention, because they are CO2 emission reducible as compared with fossil fuels, especially the CO2 emission intensity of biomass is estimated to be zero. Also, biomass has advantages of low ash and sulfur contents but has high water content and low calorific value. Therefore, biomass should be dehydrated and upgraded for an energy resource. The authors have previously reported about the hydrothermal treatments of woody biomass, low rank coal and their mixture known as a hot water drying method. In the series of study, a solid product of ca. 7000 kcal/kg calorific value was obtained from Acacia Mangium , Cryptomeria Japonica , low rank coal and the mixture of Cryptomeria Japonica and low rank coal by using a batch equipment. Oil palm trees have widely been cultivated in Southeast Asia to extract oil. A large quantity of the by-produced empty fruits bunch (EFB) has been expected to be used effectively. Under such a background, we have studied on effective utilization of EFB. In the present study, using the same technique, we have attempted to recover a bio-oil..
Current and Past Project
  • This project aims the development of the CO2-blown integrated gasification combined cycle, using highly concentrated recycled CO2 as the carrier and quench gases.
  • The project aims at the production of value added chemicals, steam coal, coking coal and ultra low ash slurry fuel by multistage hydrothermal treatment of unutilized high-moisture-content low rank coal and biomass. Utilizing catechol containing liquid phase, it also aims to suppress the acid mine drainage that is problematic during mining.
  • The project aims at scientific proof and establishment of scientific bases of simultaneous upgrading of brown coal and biomass into tar-free active char/charcoal (TFAC), brown-coal/biomass derived coking coal (BCBCC) and light oil, and also downstream processes such as low-temperature/fast gasification of TFAC into syngas and production of high quality coke and advanced carbon materials from BCBCC.
Academic Activities
1. 野中 壯泰, 平島 剛, 熊谷 聡, Monosaccharide Recovery from Peat and Peatified Wood by Ultrasonication Pretreatment and hydrothermal Treatment, International Journal of Clean Coal and Energy, 2017.06.
2. 野中 壯泰, 平島 剛, 熊谷 聡, 笹木 圭子, Hydrothermal treatment of lignite for CO2 gasification, 資源素材学会, 131, 5, 2015.05.
3. 熊谷 聡, Limsuwan Pilasinee, 野中 壯泰, 平島 剛, Separation of furfural generated by hydrothermal treatment of coconut shell, 木質炭化学会誌, 10, 2, 2014.10.
4. In this study, hydrothermal treatment of coconut shell and separation of the reaction products were investigated.
At first, coconut shell was conducted by hydrothermal treatment at 200℃ for 30 min. Then solid-liquid separation of the reaction products was done by a filtration, after that furfural recovery from the filtrates was treated by several commercial activated carbon (FP-1, FP-3, FP-6, FP-9, Japan EnviroChemicals Ltd.). Finally, desorbed of the adsorbed furfural in the activated carbon was conduction with acetone elution. It required a three-fold amount of water used in the hydrothermal treatment for separation of the water-insoluble products and the water-soluble products. The main component of the watersoluble product was xylose, acetic acid and furfural. Their each concentration in the first filtrates was 5.1, 6.6 and 5.8 g/L, respectively. Though the recovery ratio xylose and acetic acid were more than 90% by only one time filtration, on the other hand, the furfural was 75%. We concluded that it was necessary to wash with same amount of water used in the hydrothermal treatment. The furfural could be separated selectively by the activated carbon (FP-3) adsorption from the filtrates, and then it could be desorbed by acetone elution..
5. Limsuwan, P, Kumagai, S, Moriyasu Nonaka, Keiko Sasaki, Tanthapanichakoon, W, Tsuyoshi Hirajima, Application of plasma treated activated carbon to enhancement of phenol removal by ozonation in three-phase fluidized bed reactor , Advanced Materials Research , 701, 2013.08.
6. Moriyasu Nonaka, Tsuyoshi Hirajima, Keiko Sasaki, Gravity Separation and Its Effect on CO2 Gasification, Fuel, 103, 2013.01.
7. Dewi A Iryani, Satoshi Kumagai, Moriyasu Nonaka, 笹木 圭子, Tsuyoshi Hirajima, Hot compressed water treatment of solid waste material from the sugar industry for valuable chemical production, International Journal of Green Energy, 2012.12.
8. Moriyasu Nonaka, Tsuyoshi Hirajima, Keiko Sasaki, Upgrading of Low Rank Coal and Woody Biomass Mixture by Hydrothermal Treatment, Fuel, 90, 2578-258, 2011.08.
9. Moriyasu Nonaka, Tsuyoshi Hirajima, Keiko Sasaki, Effect of Gravity Separation on CO2 Gasification, Second international symposium on gasification and its application (ISGA2010), CD-R, No. 90, ID. B21, 2010.12.
10. Moriyasu NONAKA, Tsuyoshi HIRAJIMA and Keiko SASAKI, Upgrading and Gasification of Low Rank Coal and Woody Biomass, The Third International Symposium on Novel Carbon Resource Sciences: Advanced Materials, Processes and Systems toward CO2 Mitigation, 2009.11.
11. Moriyasu Nonaka, Tsuyoshi Hirajima and Keiko Sasaki, Washability Study and Gasification Reactivity of Coal, International symposium on earth science and techonolgy 2009, 157-160, 2009.12.
12. Tsuyoshi HIRAJIMA and Moriyasu NONAKA, Upgrading of Low Rank Coal and Woody Biomass by Hydrothermal Treatment, Proc. 2nd International Symposium of Novel Carbon Resource Science, Earth Resource Science and Technology, I1-I9, 2009.05.
13. Moriyasu NONAKA, Tsuyoshi HIRAJIMA, Keiko SASAKI, Effective Utilization of Biomass Waste Using Hydrothermal , Proc. XXIV International Mineral Processing Congress, Vol.3, pp.3625-3629, 2008.09.
14. Fly ash is a by-product in coal power plants and a rich source of hollow and spherical particles. Hollow and spherical particles having density less than 1 g/cm3 are known as cenospheres. Their concentration in coal fly ash is around 1%. Particles are widely used as fillers and insulators with high performances in rubber, plastics, oil industry, space industry, glass steels, etc. due to their shape, specific surface, excellent physical and chemical properties; as a consequence, their value is relatively high. However, hollow and spherical particles are filled up with N2 and/or CO2 gas bubbles so their densities can vary from 0.6g/cm3 to near or greater than 2.0 g/cm3. Fly ash can consist of more than 80% hollow and spherical particles having particle diameter less than several hundred m and density less than 2.0 g/cm3, but there is no efficient and economic way to selectively recover them.
The authors study on the recovery of cenospheres and hollow and spherical particles having density more than 1 g/cm3 from coal fly ash using a two-inch hydrocyclone and laboratory/pilot scale Mozley multi-gravity separator(MGS). A two-inch hydrocylone having 6.4 mm of spigot diameter was used to effectively concentrate cenospheres in overflow product. A very small amount of cenospheres having density less than 1 g/cm3 were recovered as a float of overflow product. Underflow product and overflow product without cenospheres were supplied to MGS and the influence of MGS parameter such as drum rotation speed and wash water rate was studied. As a result, 54% of hollow and sphercal particles having 2.08 g/cm3 of density and 61.6 m of median diameter in underflow product was recovered as MGS lighter product and 17% of hollow and sphercal particles having 2.19 g/cm3 of density and 8.4 m of median diameter in overflow product was recovered as MGS lighter product. These results show that hollow and spherical particles having median diameter less than one hundred m with middle density can be recoverd.
15. A fundamental investigation on the extraction from biomass, low rank coal and their mixture during hydrothermal treatment was conducted by using a circulative equipment having a 10 cm3 cell. Beluga coal from Alaska, and Cryptomeria Japonica and empty fruit bunch of oil palm (EFB) were used as material samples of low rank coal and biomass, respectively. Biomass started to be decomposed at a temperature lower than that of low rank coal, which suggests that amorphous cellulose and hemicellulose were hydrolyzed. Frans such as furfural and 5-hydroxymethyl-2-furaldehyde (HMF) extracted from biomass were unstable as compared to phenol, and therefore decomposed and partially cyclized. It was considered that low rank coal adsorbed extracts from biomass due to the porous morphology. The possibility to predict the TOC from an on-line monitoring of the absorbance intensity in UV region during hydrothermal treatment was also shown..
1. 野中 壯泰, Tsuyoshi Hirajima, 熊谷聡, Keiko Sasaki, Upgrading and drying of lignite by super- and sub-critical fluids, CINEST2012, 2012.09.18.
2. High water content lignite was hydrothermally treated at temperatures ranging from 200 to 380 deg. C and it was studied how the characteristics were changed depending on the condition. .
3. Sink-and-float test and hydrothemal treatment were conducted on high ash coal and lignite, respectively. Using thermogravimetric analysis, it was studied how the gasification ability depends on the gravity and the condition of hydrothemal treatment. .
4. A CO2-blown integrated coal gasification combined cycle (IGCC) is a promising electric power generation
technology that will reduce CO2 emission due to its high efficiency. Recent studies have found that base
metals improve the coal char gasification in case that they can interact to the char matrix at an atomic level. An attempt to clarify the effect of heavy medium separation, which is one of the most popular coal cleaning technologies, on the CO2 gasification of the char derived from the coal fractionated according to the specific gravity is presented in this publication. Before sink and float test and thermogravimetric analysis, Datong Coal from china was ground to below 20 mesh that was a size usually used for a coal cleaning process. The highest separation efficiency was expected to obtain at specific gravity of 1.45 where the ash content would dramatically be reduced from 10.2 % for the raw coal to about 4 % and about 85 % of combustibles would be recovered. The chars derived from different macerals showed different gasification reactivity; Inertinitederived char has gasification reactivity higher than Vitrinite-derived one. Inorganic base metals did not show a significant catalytic effect. It was considered that heavy medium separation was an effective pretreatment technique without any significant deterioration of CO2 gasification ability..
5. Renewable resources of energy attract attention, because they are CO2 emission reducible as compared with fossil fuels, especially the CO2 emission intensity of biomass is estimated to be zero. Unutilized low coalified coal and low grade one are promising because the present mainstream of the worldwide trade of coal is high rank coals that merely occupy a half of global deposits. Hydrothermal treatment and heavy medium separation were adopted as an upgrading technology for low rank coal and biomass and for high ash coal, respectively. The hydrothermal treatment achieved a substantial increase in the carbon content, fixed carbon and gross calorific value of the material by dehydration and decarboxylation. The hydrothermally treated mixture showed almost constant chemical compositions and gross calorific value independent of a mixing ratio. By the heavy medium separation, the high ash coal was fractionated into some fractions; a high ash, a low ash and an intermediate fraction. Further, the gasification characteristic of the materials obtained by these upgrading technologies was analyzed by thermogravimetry using a thermobalance. Charring was conducted by rapid pyrolysis in a nitrogen flow and the consecutive gasification reaction was achieved in a O2/CO2 mixed gas flow to obtain useful information for a CO2-blown integrated gasification combined cycle. .