


Yoshio Iwai | Last modified date:2021.05.25 |

Associate Professor /
Molecular and Biochemical Systems Engineering
Department of Chemical Engineering
Faculty of Engineering
Department of Chemical Engineering
Faculty of Engineering
Graduate School
Undergraduate School
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Homepage
https://kyushu-u.pure.elsevier.com/en/persons/yoshio-iwai
Reseacher Profiling Tool Kyushu University Pure
http://www.chem-eng.kyushu-u.ac.jp/lab1/index_English.html
Research subjects etc. are explained .
Phone
092-802-2751
Fax
092-802-2751
Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
Yes
Field of Specialization
Chemical Engineering
Total Priod of education and research career in the foreign country
01years00months
Outline Activities
I lecture and research properties and chemical physics in chemical engineering. Main subjects are properties in chemical engineering, industrial chemical physics, phase equilibrium, supercritical fluid technology, and separation technology.
My lectures
for master course students : phase equilibria (English lecture)
for undergraduate students :
chemical physics for process design
I issued text book “Chemical physics for engineering, ed. by Y. Arai and Y.Iwai, Asakurasyoten(1991).”
My lectures
for master course students : phase equilibria (English lecture)
for undergraduate students :
chemical physics for process design
I issued text book “Chemical physics for engineering, ed. by Y. Arai and Y.Iwai, Asakurasyoten(1991).”
Research
Research Interests
Membership in Academic Society
- Test of thermodynamic models by molecular simulation and propose of new models
keyword : Activity coefficient, Molecular simulation, Athermal term, Interaction term
2009.04. - Production of functional materials by using supercritical carbon dioxide
keyword : supercritical carbon dioxide,cotton, solar cell, metal polymer complex
2009.04. - Phase equilibria for water + hydrocarbon + alcohol systems at high temperature and pressure
keyword : phase equilibrium, high temperature pressure, supercritical water, subcritical water, hydrocarbon, supercritical alcohol
2005.04As fundamental data to develop new chemical processes using sub- or supercritical water, phase equilibria of water + hydrocarbon + alcohol systems have been measured at high pressures and high temperature. Further, their phase behaviors are discussed and a successful prediction method is proposed.. - Estimation of activity coefficients for isomers
keyword : activity coefficient, isomer
2005.04Liquid phase activity coefficients are very important to express the non-ideality of solutions. A group-contribution method is considered to be a successful approach for various mixtures. However, it is very difficult to distinguish the isomers by the original ASOG. The entropy term has been revised and the contact probability between groups is introduced to propose a modified ASOG. Good results are shown for mixtures containing alkanes, alcohols and ethers.. - Analysis of micro structures of fluids by molecular simulation
keyword : molecular simulation, micro structure, fluid, molecular dynamics simulation, Monte Carlo simulation
2005.04To elucidate the microstructures of high-pressure gaseous mixtures and solutions is important and helpful to develop a successful prediction method for mixture properties. By using the Monte Carlo method and the molecular dynamics, solubilities and diffusion coefficients of solutes in supercritical carbon dioxide are simulated. Further, the microstructures of mixtures are also analyzed by the radial distribution function.. - Effect of electrohydrodynamics on extraction and cleaning in supercritical fluid
keyword : electrohydrodynamics, supercritical fluid, mass transfer
2005.04~2012.12Crystallization is one of the most effective methods to obtaine ultra pure organic compounds. However, the purity decreases when impurities are included in the solid phase through the liquid-solid interface during the solidification processes. It is acknowledged that the turbulent flow is caused when the electric field applied to organic liquids. By using this effect, impurities may be removed from the liquid-solid interface. Aromatic compounds are interested. For example, the effect of electric field can be observed in crystallization of 3,5-xylenol (2,5-xylenol as an impurity).. - Solubilities of salts in water at high temperature and pressure
keyword : subcritical water, supercritical water, salt
2005.04~2010.12In oxidation processes of PCB and dioxine using sub- or supercritical water, hydrogen chloride is produced and is neutralized by adding alkali. Solubility data of inorganic salts are important knowledge because inorganic salts such as NaCl produced cause blockage of equipments. Solubilities of NaCl, KCl, and LiCl in water at high temperature and high pressures are measured and a successful prediction method is developed.. - Vapor-liquid equilibria of supercritical carbon dioxide + citrus oil compounds systems and entrainer effects
keyword : supercritical carbon dioxide, citrus oil, entrainer effect
2005.04~2010.12An fundamental knowledges to separate limonene and linalool contained in citrus oil by using supercritical carbon dioxide, high pressure vapor-liquid equilibria of carbon dioxide + limonene+ linalool ternary system have been measured. To discuss the effect of ethanol added as an entrainer to enhance the separation efficiency, carbon dioxide + limonene + linalool + ethanol quaternary system are measured and a useful prediction method is developed using an equation of state.. - Solubilities of fluorinated compounds in supercritical carbon dioxide
keyword : supercritical carbon dioxide, fluorinated compound, solubility
2005.04~2010.12A large solubility of a fluorinated compound is acknowledged. To consider the solubility enhancement by fluorination and the relation between the solubility and the position of fuluorinated group in the compound, the solubilities of 2-trifluoro, 3-trifluoro, and 4-trifluoromethylbenzoic acids in supercritical carbon dioxide have been measured referring to benzoic acid. The solubility data obtained are correlated by using an equation of state or a solution model..
- Investigation for altitude use of water for the purpose of earth environment matching new technique development
Books
Papers
- The Society of Separation Process Engineers, Japan
- Gas chromatographic determication of infinite dilution activity coefficients for alcohols, ketones and aromatic hydrocarbons in 4-methyl-N-butylpyridinium tetrafluoroboronate and 1-butyl-3-methylimidazolium hexafluorophosphate
Educational
Educational Activities
My lectures
for master course students : phase equilibrium
for undergraduate students :chemical physics for process design
Student experiment 1
I issued text book “Chemical physics for engineering, ed. by Y. Arai and Y.Iwai, Asakurasyoten(1991).”
Other Educational Activities
for master course students : phase equilibrium
for undergraduate students :chemical physics for process design
Student experiment 1
I issued text book “Chemical physics for engineering, ed. by Y. Arai and Y.Iwai, Asakurasyoten(1991).”
- 2005.09.
Social
Professional and Outreach Activities
According to the requests from engineers of several companies, advices and suggestions are given mainly in the subjects of fluid properties and phase equilibria. Also, supercritical fluid (SCF) technologies and properyies of chemical engineering are discussed through the SCF and fandamental property divisions of the Society of Chemical Engineers of Japan..


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