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4. Optimisation of Interfacial Modification by Two-Stage Microwave Irradiation.

Author

Asakuma, Yusuke, Watanabe, Yusuke, Hyde, Anita, and Phan, Chi

Subjects
*NONIONIC surfactants, *PETROLEUM production, *PETROLEUM refining, *MANUFACTURING processes, *MICROWAVES
Abstract

Microwave-assisted de-emulsification is attractive in the processes of petroleum production and refining. The main advantage of microwaves is their direct influence on the surfactant layer at the oil/water interface. Previously, an effective interfacial modification was demonstrated by pulsed microwave irradiation. However, the effect of the modification diminished during the off interval of the pulse irradiation. In this study, two-stage microwave irradiation with different powers and durations was applied as a method to maintain an interfacial effect. The power of the second stage was changed to optimise the modification. Quick modification was obtained by high-power irradiation followed by low-power irradiation. It was confirmed a sustained modification was maintained by a moderate power of the second irradiation. This observation indicates a re-adsorption or re-structure process after the first irradiation is suppressed by the second irradiation. The results open new opportunities to optimise microwave operation in oil/water systems. [ABSTRACT FROM AUTHOR]

Published
2024
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45. In‐situ monitoring of decane‐in‐water emulsion during microwave irradiation.

Author

Ueda, Shota, Nakanishi, Sari, Shibatani, Atsuya, Asakuma, Yusuke, and Phan, Chi

Subjects
EMULSIONS, MICROWAVES, PETROLEUM production, SURFACE tension, IRRADIATION, FOOD emulsions, BUBBLE column reactors
Abstract

Microwave (MW)‐assisted de‐emulsification has been attractive in processes of petroleum production and refining. However, the mechanism and optimal operation remain poorly understood. In this study, the behaviour of decane‐in‐water emulsion under MW irradiation was monitored in‐situ through a size measurement system equipped with the reactor and surface tension profiles. The results indicated that the bubble was formed around the oil droplet during MW irradiation. The MW‐induced bubbles can enhance de‐emulsification in a similar mechanism as the flotation column. The efficiency of MW de‐emulsification depends on emulsion content and MW power. Although a higher MW power is more effective, boiling caused by excessive energy must be considered due to the higher local heating. As a result, moderate power is more desirable. For the decane‐in‐water emulsions in this study, the optimal condition was determined to be around 500 W. [ABSTRACT FROM AUTHOR]

Published
2023
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