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Yukihiko Matsumura,Soichi Hirota,Shuhei Inoue,Takahito Inoue,Yoshifumi Kawai,Yasutaka Wada,Takashi Noguchi 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
Supercritical water gasification (SCWG) has attracted attention as a technology for utilizing wet biomass. We used a fluidized bed of alumina particles to prevent blockage of a SCWG reactor. A glucose solution was heated in the reactor with and without fluidized alumina particles. In the absence of alumina particles, char particles formed homogeneously in the reactor, but the use of a fluidized bed resulted in accumulation of char particles at the reactor’s exit rather than inside the reactor. Therefore, the fluidized bed was effective at preventing blockage of the reactor. However, the alumina particles did not remove deposits from the reactor’s walls. Instead, the fluidized bed caused larger char particles to form, preventing their adhesion to the reactor’s wall.
Cell structure destruction and its kinetics during hydrothermal treatment of sewage sludge
Apip Amrullah,Nattacha Paksung,Yukihiko Matsumura 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.3
During hydrothermal treatment (HT) of sewage sludge (SS), its cell structure is decomposed and its organic content is released. An increase in the total organic carbon content in the liquid phase was experimentally determined in the temperature range of 130-250 oC with a fixed pressure of 5MPa and residence time of 10min. By using the Arrhenius equation, the pre-exponential factor and activation energy were successfully determined for the first time for the degradation of SS cells as 3.96×1010 s1 and 115 kJ mol1, respectively, for the temperature range of 130-250 oC. Increasing the HT temperature increasingly destroyed the cell structure of SS.
In situ mass spectrometry of glucose decomposition under hydrothermal reactions
Pattasuda Duangkaew,Shuhei Inoue,Tsunehiro Aki,Yutaka Nakashimada,Yoshiko Okamura,Takahisa Tajima,Yukihiko Matsumura 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5
We designed an in situ mass spectrometry (in situ MS) analysis method and developed to identify the products of glucose decomposition under hydrothermal condition for the first time. The in situ MS analysis was performed by coupling a tubular batch reactor with a quadrupole mass analyzer via custom-built connection fittings. The products of glucose decomposition were investigated by in situ MS, mass spectrometry of cold effluent, and high-performance liquid chromatography (HPLC) analysis of cold effluent and the results were compared. At 140 oC, in situ MS and mass spectrometry of cold effluent showed that the decomposition of glucose does not proceed; this was confirmed by comparison with the mass spectral database for glucose. At 180 oC or higher, a clear base fragmentation peak of 5-hydroxymethylfurfural (5-HMF) at position m/z 97 and that of furfural at m/z 96, formic acid (m/z=46) and levulinic acid (m/z=116) were observed by mass spectrometry. No levulinic acid or furfural was observed through conventional HPLC analysis under any condition; only glucose, formic acid, and 5-HMF could be detected. The effectiveness of in situ MS analysis is clear, compared to mass spectrometry analysis of cold effluent and HPLC analysis.