Effect of Surface-Active Agents on Gas Holdup in an Aqueous Solution Containing Microbubbles

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Masayuki Takashima²  Takayasu Kubozono²  Tomonari Suekuni²  Shuya Yoshioka¹  Shinichi Watanabe² 

[1] Department of Mechanical Engineering, College of Science and Engineering, Ritsumeikan University;Department of Functional Material Science Research Laboratory, Lion Corporation

关键词: Microbubble;    Gas Holdup;    Dynamic Surface Tension;    Surface-Active Agent;    Multiphase Flow;   

DOI  :  10.1252/jcej.14we267

来源: Maruzen Company Ltd

【 摘 要 】

References(13)It is not clear how the gas holdup of a solution containing microbubbles changes with the use of different surface-active agent coating microbubbles. This study investigated how the gas holdup of an aqueous solution containing microbubbles relates to the dynamic surface tension of the solution and the surface charge of surface-active agents coating the microbubbles. Microbubbles were generated using a static mixer. When a non-ionic organic chemical was used as the surface-active agent, the gas holdup increased with a decrease in dynamic surface tension. A similar trend was observed for sodium alkyl sulfate, alkyl trimethylammonium chloride, and polyoxyethylene dodecyl ether. However, the gas holdup in aqueous solutions of an ionic surfactant was more sensitive to the change in the dynamic surface tension than that of nonionic surfactant. The effect of electric charge on a surfactant on the gas holdup was examined using an amphoteric surfactant, i.e. N-lauryl β-aminopropionic acid. Its chemical structure changes with solution pH, resulting in a change in ionicity. The gas holdup was a minimum at the isoelectric point of the amphoteric surfactant (pH 4.0). Thus, this study proved that gas holdup depends on the dynamic surface tension of the solution and the surface charge of microbubbles.

【 授权许可】

Unknown