Editor-in-Chief
Manabu Shimada (Hiroshima University)

Associate Editor-in-Chiefs
Masahiro Shishido (Yamagata University)
Ken-Ichiro Sotowa (The University of Tokushima)

Editors
Choji Fukuhara (Shizuoka University)
Toshitaka Funazukuri (Chuo University)
Yoshihiro Hashimoto (Nagoya Institute of Technology)
Shunji Homma (Saitama University)
Jun-ichi Horiuchi (Kyoto Institute of Technology)
Yoshinori Itaya (Gifu University)
Masashi Iwata (Osaka Prefecture University)
Noriho Kamiya (Kyushu University)
In-Beum Lee (Pohang University of Science and Technology (POSTEC))
Kouji Maeda (University of Hyogo)
Hideyuki Matsumoto (National Institute of Advanced Industrial Science and Technology (AIST))
Michiaki Matsumoto (Doshisha University)
Nobuyoshi Nakagawa (Gunma University)
Tsuguhiko Nakagawa (Okayama Prefectural University)
Yasuya Nakayama (Kyushu University)
Masaru Noda (Fukuoka University)
Mikihiro Nomura (Shibaura Institute of Technology)
Eika W. Qian (Tokyo University of Agriculture and Technology)
Yuji Sakai (Kogakuin University)
Noriaki Sano (Kyoto University)
Naomi Shibasaki-Kitakawa (Tohoku University)
Hiroshi Suzuki (Kobe University)
Nobuhide Takahashi (Shinshu University)
Kazuhiro Takeda (Shizuoka University)
Shigeki Takishima (Hiroshima University)
Yoshifumi Tsuge (Kyushu University)
Tomoya Tsuji (Nihon University)
Shigeyuki Uemiya (Gifu University)
Da-Ming Wang (National Taiwan University)
Takayuki Watanabe (Kyushu University)
Takuji Yamamoto (University of Hyogo)
Tetsuya Yamamoto (Nagoya University)
Masahiro Yoshida (Kagoshima University)
Yasuo Yoshimi (Shibaura Institute of Technology)
Miki Yoshimune (National Institute of Advanced Industrial Science and Technology (AIST))

Editorial office:
The Society of Chemical Engineers, Japan
Kyoritsu Building, 4-6-19, Kohinata, Bunkyo-ku
Tokyo 112-0006, Japan
journal@scej.org

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

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Ternary mixed solvents solution of water–hydrophilic/hydrophobic organic solvent is an example of a two-phase separation, mixed solvent solution system. Upon temperature change, the homogeneous solution (single-phase) changes to the heterogeneous solution (two phases), generating upper (organic solvent-rich) and lower (water-rich) phases in a batch vessel. When the ternary mixed solution is fed into a microspace, the solvent molecules are radially distributed in the microspace under laminar flow conditions, generating inner and outer phases. Herein, this is termed the tube radial distribution phenomenon (TRDP). In this study, the dimensionless number, Weber number, of the inner and outer phases in the TRDP process was estimated for the water–acetonitrile–ethyl acetate and water–acetonitrile–chloroform systems. Further, as an attempt, a relationship between the Weber number and TRDP formation was examined for the two model systems in this experiment. TRDP was observed in both systems when the Weber numbers of the organic solvent-rich and water-rich phases were different. However, an either excessively large or small difference in the Weber numbers did not instigate TRDP. TRDP formation was compared with an annular flow formation using the immiscible mixed solvent solutions.

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Surfactant-modified palygorskite (PA) samples were prepared and used as adsorbents to remove aqueous humic acid (HA). Characterization results confirmed the successful modification of PA by the surfactants. Surfactant modification of PA remarkably improved its adsorption for aqueous HA, and the HA adsorption increased with increasing alkyl chain length of the surfactants, indicating that hydrophobic interaction and electrostatic interaction are the driving forces for HA adsorption. The adsorption amount of HA onto the surfactant-modified PA was well described by the Freundlich model, and the maximum adsorption amount of HA on PA-OTAC, PA-DTAC, and PA-CTAC was 57.43, 199.86, and 253.00 mg/g over the tested concentration range. The pseudo-second-order kinetic model fitted the HA adsorption on PA-CTAC very well. HA adsorption on PA-CTAC decreased with increasing solution pH, and the presence of cations in water increased HA adsorption on the adsorbent. The PA-CTAC loaded adsorbent was easily desorbed in 0.1 mol/L NaOH, and the regenerated adsorbent showed have good adsorption capability for HA.

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Novel biopolymer-based composite membranes have been prepared for the dehumidification of air. Biopolymers, such as silk fibroin, DNA-Na and chitosan, were used as the base membrane materials. To facilitate the moisture adsorption, a hygroscopic lithium chloride (LiCl) salt was incorporated into the biopolymers. The dehumidification efficiency of each material was evaluated in terms of the condensed-water recovery rate and water permeability. All of the biopolymer composite membranes showed a higher water recovery rate as compared to the triethylene glycol liquid membrane. The most efficient dehumidification performance was shown by the silk fibroin composite membrane with the moisture recovery rate of 11 g/h at 80%RH and mean water permeability of 1.84×10⁻¹¹ kmol m m⁻² s⁻¹ kPa⁻¹. This result was attributed to the high sorption of water into the silk fibroin (protein) and LiCl composite material.

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In order to improve the performance of the centrifuge, a new design of dewatering of slurry which forms a less permeable cake is proposed. In the proposed design, the filter media is placed not only on the circuit, but also at the bottom of the filter chamber. The additional bottom filter medium is expected to work as a bypass. A comparison of the conventional and new designs is made in this study. The supernatant is completely discharged in a much shorter time when the new method is used; hence, the filter medium at the bottom of the filter chamber works as a bypass and improved the dewatering performance.

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This study examines the use of base-activated sodium persulfate as a means of treating two types of soil contaminated with ferric and cupric cyanide complexes. The proposed treatment uses sodium persulfate and sodium hydroxide to convert insoluble cyanides into soluble form. The soils used in this study had high and low total cyanide contents of 1000 and 50 mg/kg, respectively, and free cyanide contents of 360 and 1.7 mg/kg, respectively. When sodium hydroxide was added, the concentrations of cyanides solubilized from soil were 5–10 times higher than those of samples not treated with sodium hydroxide. When 5% sodium persulfate and 1.5% sodium hydroxide were used, the proposed treatment decreased the total cyanide content in contaminated soil to less than 5 mg/kg and the cyanide content eluted from soil contaminated with ferric cyanide complexes to less than 1 mg/L, respectively. These values are below the values stipulated by environmental standards and the emission standards in Japan. Therefore, base-activated sodium persulfate treatment is considered effective for the removal of persistent cyanide from soil.

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