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Volume 42, Issue 1
Displaying 1-6 of 6 articles from this issue
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Editorial Note
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2016 Volume 42 Issue 1 Pages edit_1
Published: January 20, 2016
Released on J-STAGE: January 20, 2016
JOURNAL RESTRICTED ACCESSDownload PDF (206K)
Separation Engineering
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Kyosuke Yabiki, Hiromi Eba, Kenji SakuraiArticle type: Separation Engineering
2016 Volume 42 Issue 1 Pages 1-7
Published: January 20, 2016
Released on J-STAGE: January 20, 2016
JOURNAL RESTRICTED ACCESSThe Cs adsorption capacity of layered sodium silicate ilerite, which has ion exchange ability, was investigated. The amount of Cs ions (Cs+) absorbed from aqueous solution was estimated, and the adsorption/desorption behavior of ilerite was examined by X-ray diffraction and thermal analyses and compared with the corresponding properties of clay minerals. Ilerite showed a high adsorption capacity and maintained a high level of adsorption especially in the higher concentration range of Cs+. In ilerite, hydrated Cs+ ions form loosely bonded outer-sphere complexes. In addition, the silicate layer in ilerite creates a rigid channel structure, through which Cs+ ions pass sequentially to penetrate the interlayer deeply; therefore, ilerite is expected to have superior adsorption performance. The adsorbed Cs+ could be detached from ilerite by washing with an aqueous acidic solution, because the surface charges of the silicate layer of ilerite, which contribute to ionic adsorption, are pH-dependent. After the desorption of Cs+, the recycled ilerite could again adsorb Cs.View full abstractDownload PDF (2451K) -
Naotsugu Itoh, Tamami Tokunaga, Takafumi Sato, Yasuhisa Hasegawa, Yosh ...Article type: Separation Engineering
2016 Volume 42 Issue 1 Pages 8-14
Published: January 20, 2016
Released on J-STAGE: January 20, 2016
JOURNAL RESTRICTED ACCESSMembrane dehydration of isopropyl alcohol (IPA) is an attractive alternative to azeotropic distillation in terms of energy saving. First, the optimal conditions for synthetic of CHA zeolite membrane on porous alumina tubes was explored to shorten the enrichment time in a continuously recycled dehydration for IPA–water vapor mixture. Second, it was found that use of a membrane with higher water-selectivity raised the IPA recovery rate but required a longer enrichment time. It was also found that the water permeability of the membrane increased while the selectivity decreased with increasing temperature, and accordingly the operation temperature was increased in two steps, from 100 to 140°C. As a result, concentration polarization was suppressed and the enrichment time was significantly reduced.View full abstractDownload PDF (2279K) -
Kanae Shimono, Koji Inoue, Hiroshi Okano, Yosuke Matsukuma, Akio Kodam ...Article type: Separation Engineering
2016 Volume 42 Issue 1 Pages 15-21
Published: January 20, 2016
Released on J-STAGE: January 20, 2016
JOURNAL RESTRICTED ACCESSA thermal swing continuous CO2 adsorber employing a honeycomb rotor was experimentally studied. First, CO2 breakthrough curves and adsorption isotherms of various honeycomb cores binding a CO2 adsorbent material were measured at 298 K and 453 K. It was confirmed that honeycomb cores binding 13X, Li-LSX, and Na-LSX type zeolite have relatively high adsorption capacities for CO2. Honeycomb rotors binding with these zeolites were then prepared, and their CO2 removal and recovery performance were evaluated in terms of CO2 recovery concentration and recovery rate. Among the honeycomb rotors prepared and tested, the rotor containing a higher amount of 13X zeolite showed the maximum CO2 capture performance under the 298–453 K temperature swing. This 13X zeolite rotor removed CO2 from simulated flue gas containing 10% CO2 with a concentration of 90% and a CO2 recovery rate of 22%. In addition, at a CO2 recovery concentration 80%, the CO2 recovery rate improved to approximately 50%. It was also found that the CO2 capture performance of honeycomb rotor improved with increasing difference in the CO2 equilibrium adsorption amount between 298 K and 453 K, namely, the effective CO2 adsorption amount Δq. Thus, it was confirmed that Δq was useful index of the CO2 adsorbent selection for this type of CO2 adsorber.View full abstractDownload PDF (2026K)
Thermal Engineering
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Terumi Inagaki, Naoya Takeda, Masato Horibe, Yanrong LiArticle type: 熱工学
2016 Volume 42 Issue 1 Pages 22-29
Published: January 20, 2016
Released on J-STAGE: January 20, 2016
JOURNAL RESTRICTED ACCESSThe thermo-physical properties of the phase-change latent heat storage material fatty acid were elucidated in order to examine its temperature dependency. Heat transfer by natural convection was also investigated in a horizontal enclosed rectangular container filled with fatty acid, which was heated at the lower surface and cooled at the upper surface. The heat transfer coefficient of the liquid phase was found to coincide well with the conventional heat-transfer correlation of natural convection heat transfer in a horizontal enclosed rectangular container by applying the values of thermo-physical properties obtained in the present work.View full abstractDownload PDF (1995K)
Chemical Reaction Engineering
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Naomi Shibasaki-Kitakawa, Tomokatsu Oyanagi, Siqingaowa Borjigin, Kazu ...Article type: Chemical Reaction Engineering
2016 Volume 42 Issue 1 Pages 30-36
Published: January 20, 2016
Released on J-STAGE: January 20, 2016
JOURNAL RESTRICTED ACCESSA simple production process was developed for obtaining high quality biodiesel from various vegetable oils with high free fatty acid content using ion-exchange resin catalysts. A fully automated pilot-scale apparatus was designed based on the reported results using bench-scale apparatus and constructed. In addition to fatty acid methyl ester (FAME), fatty acid ethyl ester (FAEE), which has attracted attention as an environmentally preferable biodiesel, was both produced from cheaper non-edible oil with 50 wt% FFA content. Both biodiesel products fully met the international fuel standard specifications without downstream purification processes other than removal of alcohol. The calorific values of FAEE were higher than those of FAME, which promises improved fuel economy and horsepower.View full abstractDownload PDF (6966K)
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