Editors Ryuichi Egashira (Tokyo Institute of Technology) Jun Fukai (Kyushu University) Choji Fukuhara (Shizuoka University) Toshitaka Funazukuri (Chuo University) Takayuki Hirai (Osaka University) Jun-ichi Horiuchi (Kitami Institute of Technology) Eiji Iritani (Nagoya University) Yoshinori Itaya (Gifu University) Noriho Kamiya (Kyushu University) In-Beum Lee (Pohang University of Science and Technology (POSTEC)) Kouji Maeda (University of Hyogo) Hideyuki Matsumoto (Tokyo Institute of Technology) Nobuyoshi Nakagawa (Gunma University) Masaru Noda (Fukuoka University) Hiroyasu Ogino (Osaka Prefecture University) Mitsuhiro Ohta (The University of Tokushima) Eika W. Qian (Tokyo University of Agriculture and Technology) Yuji Sakai (Kogakuin University) Noriaki Sano (Kyoto University) Naomi Shibasaki-Kitakawa (Tohoku University) Ken-Ichiro Sotowa (The University of Tokushima) Hiroshi Suzuki (Kobe University) Nobuhide Takahashi (Shinshu University) Shigeki Takishima (Hiroshima University) Yoshifumi Tsuge (Kyushu University) Tomoya Tsuji (Nihon University) Da-Ming Wang (National Taiwan University) Takuji Yamamoto (University of Hyogo) Yoshiyuki Yamashita (Tokyo University of Agriculture and Technology) Miki Yoshimune (National Institute of Advanced Industrial Science and Technology (AIST))
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AIMS AND SCOPE:
Journal of Chemical Engineering of Japan, an official publication of the Society of Chemical Engineers, Japan, is dedicated to providing timely original research results in the broad field of chemical engineering ranging from fundamental principles to practical applications. Subject areas of this journal are listed below. Research works presented in the journal are considered to have significant and lasting value in chemical engineering.
Physical Properties and Physical Chemistry Transport Phenomena and Fluid Engineering Particle Engineering Separation Engineering Thermal Engineering Chemical Reaction Engineering Process Systems Engineering and Safety Biochemical Food and Medical Engineering Micro and Nano Systems Materials Engineering and Interfacial Phenomena Energy Environment Engineering Education
The modeling of high-pressure viscosities of liquid mixtures is of fundamental importance in many chemical and engineering processes. In this work, we present a new model for correlating and predicting viscosities for binary liquid mixtures, which is based on the Eyring’s absolute rate theory combined with a cubic PR equation of state, MHV1 mixing rule and van Laar Equation. The method has been used to calculate viscosities for liquid binary mixtures which included associative mixtures of n-alkanes, substituted alkanes, cyclic alkanes, n-alcohols, polyols, n-amines, alkanones, aromatics and ionic liquids. The binary interaction parameters of the van Laar equation have been determined by fitting literature viscosity data of 47 binary mixtures at low pressures, and the model gives an accurate correlation of viscosities for liquid binary mixtures with an overall average deviation of 0.877%. High-pressure viscosities of 32 binary mixtures have been predicted using this model as well, and the absolute average deviation between calculated and experimental data is 3.051%, the satisfactory result demonstrating that the proposed model can be successfully representative of high-pressure viscosities for different types of liquid mixtures.
Based on the throwing–motion theory and the fluidization separation principle, a vibrating fluidized bed separator whose distributor was set to a negative-angle was designed. The results of gangue transportation with/without dense medium in the vibrating fluidized bed separator showed that a series of problems caused by gangue transportation with a scraper in gas–solid fluidized bed were solved. Without dense medium, the migration force and the transportation velocity increased with increasing installation angle of the separator. The vibration inertia force along the distributor was increased with increasing throwing index. With dense medium, vibration energy stimulated the activity of dense medium, and the transportation performance of the separator was increased with increasing superficial gas velocity and throwing index.
In this study, corrosion in the carbon capture and storage process was investigated by the weight loss method using aqueous potassium carbonate as an absorbent. Potassium carbonate, in combination with CO2 and H2O, was converted to carbonate and bicarbonate that increased the corrosion. All experiments were conducted using carbon steel (JIS SS41) specimens, and the corrosion characteristics were evaluated at elevated temperatures. The effects of the organic corrosion inhibitors were explored at different concentrations, and 1,2,3-benzotriazole and ammonium thiocyanate proved to be the best inhibitors with maximum protection efficiencies of 99.5% and 90.0%, respectively, at a concentration of 1.0 wt%. In addition, rate promoters did not degrade the inhibitors.
Carbon dioxide (CO2) capture by aqueous amine solutions has been developed to facilitate CO2 capture and storage (CCS) technology. In the present study, gas scrubbing tests were performed using twelve alkanolamine absorbents, including a variety of primary, secondary, and tertiary amines, with some hindered amines. The resulting absorption characteristics are discussed in the context of the pKa values of the amines as well as the 13C-NMR spectra and reaction kinetics. The absorption rate (α′CO2) was revealed to correlate strongly with the reaction rate constant (k2) of the CO2-amine second order reaction. A linear equation, log10(k2)=A·α′CO2+B, was derived for the aqueous amine solutions evaluated in the current study. For the experimental conditions of 20% CO2 gas and 2 mol/L amine solution, the constants A and B were 0.0285 and −0.4564 for the primary and secondary amines, and 0.0107 and −0.3726 for the hindered amines, respectively. Furthermore, the correlation between the reaction rate constants and pKa values of the hindered amines could be expressed as ln(k2)=0.436pKa+12.92−5,379/T.
It is generally difficult to selectively capture specific nanoparticles from particle mixtures by conventional separation methods, for example, sedimentation and filtration. In the present study, carbon nanoparticles having an average diameter of 27 nm loaded with Pt nanoparticles having an average diameter of 1.9 nm were separated from their mixture with pristine carbon nanoparticles. For the particle-separation experiments, the Pt-loaded carbon nanoparticle (Pt-CNP) was prepared from commercial carbon black by loading Pt from a H2PtCl6 aqueous solution. The electrodes used for dielectropheresis (DEP) separation were fabricated by photolithography, and the target particle mixture was dispersed in ethanol. It was found that the Pt-CNP was purified by the present DEP separation. The influences of the electrode motion speed, the amplitude and the frequency of AC voltage applied on the electrodes, the duration to apply voltage in liquid, and the addition of a surfactant were investigated. It was found that there were optimized values in these operation parameters to achieve a high purification factor reaching approximately 92%, and the reasons of these influences were qualitatively discussed.
In this study, a high speed jet was used to deposit silicon by SiH4/H2 plasma-enhanced chemical vapor deposition (PE-CVD), demonstrating a higher deposition rate than conventional PE-CVD. The shape of the deposited silicon material was found to depend on the mass-flow rate of the SiH4/H2 mixture. The velocity profiles of the jet flow were subsequently analyzed by computational fluid dynamics (CFD), with the results indicating that the velocity of the jet significantly influences the mass of silicon deposited on a glass substrate due to variation in mass transfer near substrate surface.
A method for the recovery and enrichment of the phosphate from dephosphorization slag was examined. First, the elution of aqueous phosphate from dephosphorization slag using aqueous HNO3 was examined using both the batch and flow methods. With the batch method, 82% of the dephosphorization slag could be dissolved within 30 min using 1.0 mol/L HNO3, indicating that the batch method could be used for mass processing to extract phosphorus in the bulk phase, but all components contained in the slag were unselectively dissolved. In contrast, by using 0.05 mol/L HNO3 via the flow method, 22% of the slag was dissolved in 100 min giving a more selective dissolution of phosphate from the slag compared with the batch method, which indicated that this method would be incompatible with mass processing for the purpose of extracting phosphorus in the bulk phase. In order to remove the Fe-species in the aqueous solution obtained by the batch method using 1.0 mol/L HNO3, which has been referred to as the “slag solution,” it was necessary to add calcium hydroxyapatite (CaHAp) to the slag solution. The optimal conditions for the removal of Fe-species using CaHAp were observed at a solution pH of ca. 1.5, which resulted in 100% removal of the Fe-species after 4 h. When the pH of the slag solution was adjusted to 7.0 after removing the Fe species, a pale pink solid sample was precipitated. The amounts of phosphate in the slag solution and in the pink solid were 3.5 and 42.0 mol%, respectively, indicating that the treatment suggested in the present study could be used for the recovery and enrichment of phosphate, that is, phosphorous, from dephosphorization slag.
We investigated the effect of temperature and light intensity on the inhibition of growth and photosynthetic activity of the cyanobacterium Microcystis aeruginosa mediated by eight allelochemicals (five polyphenols and three fatty acids) produced by the macrophyte Myriophyllum spicatum. Analysis of specific growth rate and maximum photosystem II quantum yield revealed the reduction in photosystem II activity to be the major mechanism responsible for growth inhibition of M. aeruginosa. The degree of growth inhibition varied with changes in temperature (20–30°C) and light intensity (25–75 µmol m−2 s−1). The growth-inhibitory effect was greater at lower temperatures and light intensities; the decrease in M. aeruginosa growth at 20°C was 1.9 times the rate observed at 30°C, and the decrease at 25 µmol m−2 s−1 was 1.5 times that at 75 µmol m−2 s−1. These results therefore demonstrate that variation in water temperature and light intensity should be considered when estimating the potential effects of macrophytic anti-cyanobacterial allelochemicals in aquatic environments.