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For chemical engineers with worldwide perspective

Hideki TSUGE (Ph.D)

This is a photo of our lab camp in Hakone. All students participated, including 4 students in the 4th year level, 4 in the 1st year of the Master's program, 4 in the 2nd year of the Master's program, and 1 in the 2nd year of the Doctoral program.

Mrs. Li Pan in the 2nd year of the Doctoral program is discussing on the experiments of micro bubbles gathering worldwide attention.

Mr. Kuze, Ms. Sakamoto and Mr. Tamura, who are in the master's course program and in the reactive crystallization group, are discussing the characteristics of particles obtained in experiments on a PC monitor.

We study chemical reactions between gas and liquid, particularly phenomena where bubbles have a role, from fundamentals to applications. We focus on the development of fundamental technologies for reactive crystallization, or crystallization by chemical reaction, to produce micro particles. The results of our studies are highly expected to be the key technologies to solve the urgent issues, such as global warming, environmental pollution, and energy resource problems. Furthermore, we have tried to develop chemical facilities that have high performances and added values for the future technology. Let us introduce a part of them.
Micro bubbles, 10 to 40ƒÊm air bubbles, are drawing worldwide attention recently, having the following characteristics: small diameter, slow rising velocity (long life time in liquid), high pressure inside the bubble (self-pressurization effect), and negatively-charged on the bubble surface. Our researches have been made, based on the characteristics of micro bubbles, for the following themes:
Production of purified water through purification of water quality
Development of high-performance bubble column
Organic degradation in a liquid phase
Utilization of ozone-entrained micro bubbles for sterilization
Application to bioreactors
Other researches utilizing bubbles include:
Development of the injection method of bubbles for the complete absorption processing equipment using molten salt of organic chlorinated compounds
Clarification of the mechanism of resolution of bubbles into the liquid in the vibration stirring device
For effective use of dissolved components in seawater and carbon dioxide in effluent gas from plants, we are doing research on the mechanism of reactive crystallization (crystallization by chemical reaction) of carbonates of magnesium, lithium and calcium in seawater. Also, we study reactive crystallization for the recovery of calcium phosphate dissolved in cheese whey produced in the process of cheese making, and that for nickel hydroxide particles used as positive electrode of nickel hydrogen battery.
If you are interested in environmental issues and effective utilization of resources in seawater, which should be solved in the 21st century, please visit our website.