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487 results on '"Takahashi, Shigetoshi"'

4. In-situ biogas upgrading with H-2 addition in an anaerobic membrane bioreactor (AnMBR) digesting waste activated sludge

Author

Hafuka, Akira, Fujino, Sota, Kimura, Katsuki, Oshita, Kazuyuki, Konakahara, Naoya, Takahashi, Shigetoshi, Hafuka, Akira, Fujino, Sota, Kimura, Katsuki, Oshita, Kazuyuki, Konakahara, Naoya, and Takahashi, Shigetoshi

Abstract

Biological in-situ biogas upgrading is a promising approach for sustainable energy-powered technologies. This method increases the CH4 content in biogas via hydrogenotrophic methanogenesis with an external H-2 supply. In this study, an anaerobic membrane bioreactor (AnMBR) was employed for in-situ biogas upgrading. The AnMBR was operated in semi-batch mode using waste activated sludge as the substrate. Pulsed H-2 addition into the reactor and biogas recirculation effectively increased the CH4 content in the biogas. The addition of 4 equivalents of H-2 relative to CO2 did not lead to appreciable biogas upgrading, although the acetate concentration increased significantly. When 11 equivalents of H-2 were introduced, the biogas was successfully upgraded, and the CH4 content increased to 92%. The CH4 yield and CH4 production rate were 0.31 L/g-VSinput and 0.086 L/L/d, respectively. In this phase of the process, H-2 addition increased the acetate concentration and the pH because of CO2 depletion. Compared with a continuously-stirred tank reactor, the AnMBR system attained higher CH4 content, even without the addition of H-2. The longer solid retention time (100 d) in the AnMBR led to greater degradation of volatile solids. Severe membrane fouling was not observed, and the transmembrane pressure remained stable under 10 kPa for 117 d of continuous filtration without cleaning of the membrane. The AnMBR could be a promising reactor configuration to achieve in-situ biogas upgrading during sludge digestion.

Published
2022

7. Rapid exciton migration and fluorescent energy transfer in helical polyisocyanides with regularly arranged porphyrin pendants

Author

Fujitsuka, Mamoru, Okada, Ayumi, Tojo, Sachiko, Takei, Fumie, Takahashi, Shigetoshi, Onitsuka, Kiyotaka, and Majima, Tetsuro

Subjects
Porphyrins -- Chemical properties, Isocyanates -- Atomic properties, Energy transfer -- Analysis, Exciton theory -- Atomic properties, Chemicals, plastics and rubber industries
Abstract

Photophysical properties of polyisocyanides possessing porphyrin pendants are investigated by steady state and transient spectroscopic methods. The resulting substantial exciton coupling in the porphyrin polymers is also examined.

Published
2004

9. New atrificial host compounds containing galactose end groups for binding chiral organic amine guests: chiral discrimination and their complex structures

Author

Shizuma, Motohiro, Kadoya, Yukiko, Takai, Yoshio, Imamura, Hiroyuki, Yamada, Hitoshi, Takeda, Tokuji, Arakawa, Ryuichi, Takahashi, Shigetoshi, and Sawada, Masami

Subjects
Chemistry, Organic -- Research, Galactose -- Physiological aspects, Amines -- Physiological aspects, Chirality -- Physiological aspects, Oligosaccharides -- Physiological aspects, Ethylene -- Physiological aspects, Oxygen -- Physiological aspects, Cyclic compounds -- Physiological aspects, Biological sciences, Chemistry
Abstract

Research has been conducted on the linear and cyclic hosts with the galactopyranose and oxyethylene skeletons. The design of these hosts based on the structural features of the fructo-oligosaccharide derivatives which have chiral discrimination ability and the hosts's synthesis are described.

Published
2002

12. Effect of phosphate compound on the reduction of the pressure drop of laboratory-scale fabric filter.

Author

Takahashi, Shigetoshi, Hwang, In-Hee, Matsuo, Takayuki, Tojo, Yasumasa, and Matsuto, Toshihiko

Subjects
PRESSURE drop (Fluid dynamics), CALCIUM phosphate, PARTICULATE matter, DUST, FLUE gases, INCINERATION, INCINERATORS
Abstract

Fabric filters are generally used to eliminate the particulate matter of flue gas that is generated from waste incinerators. The pressure drop of fabric filter (ΔP) is accompanied by the build-up of a dust layer on the fabric filter, and ΔP increase leads to an increase in the energy consumption of induced draft fan in an incineration facility. In this study, phosphoric acid (H3PO4) and monobasic calcium phosphate (Ca(H2PO4)2) are tested as chemicals to reduce ΔP in fabric filter using a laboratory-scale equipment. The phosphorus concentration of collected dust was correlated to the increment of ΔP per unit weight of dust deposited on the filter fabric. The effect on ΔP reduction was apparent at the phosphorus concentrations of 2.2–5.3 wt% in the collected dust. As a result, the gas permeability was enhanced by 2–6 times as compared to that was observed at phosphorus concentrations less than 0.6 wt%. Based on the result of XRD analysis of the dust sampled from the filer bag, it was concluded that H3PO4 reacted with the Ca compounds even though Ca-P compound could not be identified exactly. When H3PO4 was sprayed, dust particles grew in size and the surface roughness of dust layer increased too. Such changes in the physicochemical properties of dust seemed to enhance the gas permeability of the dust layer, which caused a reduction in the value of ΔP. [ABSTRACT FROM AUTHOR]

Published
2021
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13. Binding characteristics of a new host family of cyclic oligosaccharides from inulin: permethylated cycloinulohexaose and cycloinuloheptaose

Author

Takai, Yoshio, Okumura, Yasuo, Tanaka, Takanori, Sawada, Masami, Takahashi, Shigetoshi, Shiro, Motoo, Kawamura, Mishio, and Uchiyama, Takao

Subjects
Oligosaccharides -- Research, Nuclear magnetic resonance spectroscopy -- Analysis, Mass spectrometry -- Analysis, Biological sciences, Chemistry
Abstract

NMR and FAB mass spectrometry and X-ray crystallography were used to characterize the complexation behavior of permethylated cycloinuloheptaose, permethylated cycloinulohexaose and cyclic oligosaccharide hosts. An analysis of the barium cation complex structure of these compounds revealed OMe-3 oxygen of the furanose rings to contribute to cation binding. FAB mass spectroscopy was used to evaluate host-guest complex mass.

Published
1994

23. Linear polymers containing transition metals in the main chain

Author

Hagihara, Nobue, Sonogashira, Kenkichi, Takahashi, Shigetoshi, Cantow, Hans-Joachim, editor, Dall'Asta, Gino, editor, Dušek, Karel, editor, Ferry, John D, editor, Fujita, Hiroshi, editor, Gordon, Manfred, editor, Kennedy, Joseph P., editor, Kern, Werner, editor, Okamura, Seizo, editor, Overberger, Charles G., editor, Saegusa, Takeo, editor, Schulz, Günter Victor, editor, Slichter, Willam P., editor, and Stille, John K., editor

Published
1981
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24. Ruthenium-catalyzed cyclocarbonylation of allenyl alcohols and amines: selective synthesis of lactones and lactams

Author

Yoneda,Eiji, Shei-Wei Zhang, Da-Yang Zhou, Onitsuka, Kiyotaka, and Takahashi, Shigetoshi

Subjects
Lactones -- Research, Alcohols -- Research, Ring formation (Chemistry) -- Research, Ruthenium -- Research, Biological sciences, Chemistry
Abstract

Ru3(CO)12 catalyzes the cyclocarbonylation of allenyl alcohols, to give lactone derivatives with a high selectivity in a high yield, wherein the hydroxyl group is incorporated in the cyclization. This can be applied to a wide variety of allenyl alcohols having various functional groups.

Published
2003

27. Asymmetric catalysis of planar-chiral cyclopentadienylruthenium complexes in allylic amination and alkylation

Author

Matsushima, Yuji, Onitsuka, Kiyotaka, Kondo, Teruyuki, Mitsudo, Take-aki, and Takahashi, Shigetoshi

Subjects
Alkylation -- Analysis, Ruthenium -- Chemical properties, Cyclopentadiene -- Chemical properties, Chemistry
Abstract

A new enantioselective allylic amination and alkylation catalyzed by planar-chiral cyclopentadienyl-ruthenium complexes is described. The reports indicate that this is not only the first successful ruthenium-catalyzed asymmetric allylic amination and alkylation, but also the first asymmetric catalysis of planar-chiral complexes of late transition metals.

Published
2001

41. ChemInform Abstract: Optical Resolution of Ferrocene Derivatives by Liquid Chromatography Using Aqueous Cyclomaltohexaose as the Mobile Phase and Polyamide as the Stationary Phase

Author

Akira Harada, Kohji Saeki, and Takahashi Shigetoshi

Subjects
Chromatography, Aqueous solution, Resolution (mass spectrometry), Chemistry, Stationary phase, Phase (matter), Polyamide, Ferrocene derivatives, General Medicine, Enantiomer
Abstract

1-Ferrocenylethanol and its analogues were completely resolved into their enantiomers by liquid chromatography on a polyamide column using aqueous cyclomaltohexaose (α-cyclodextrin, αCD) as the mobile phase. The stability constants (K c ) for the inclusion complexes of αCD with each enantiomer of 1-ferrocenylethanol, determined by liquid chromatography with various concentrations of αCD, were for ( S )-ferrocenylethanol and for the ( R ) isomer. The temperature dependence of the resolution has been studied.

Published
1990
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