Optimisation of Interfacial Modification by Two-Stage Microwave Irradiation.

Area of Science:

• Chemical Engineering
• Materials Science
• Physical Chemistry

Background:

• Microwave-assisted de-emulsification is crucial for petroleum production and refining.
• Microwaves directly influence the surfactant layer at oil/water interfaces.
• Pulsed microwave irradiation previously showed interfacial modification, but effects diminished during off-intervals.

Purpose of the Study:

• To develop a two-stage microwave irradiation method to sustain interfacial modification.
• To optimize interfacial modification by varying the power and duration of the second irradiation stage.
• To investigate the mechanism of sustained interfacial modification.

Main Methods:

• Application of two-stage microwave irradiation with varying power and duration.
• Comparative analysis of different power levels for the second irradiation stage.
• Evaluation of the sustained interfacial effect over time.

Main Results:

• High-power followed by low-power irradiation resulted in quick modification.
• Moderate power in the second stage sustained the interfacial modification.
• The second irradiation stage suppressed re-adsorption or re-structuring processes.

Conclusions:

• Two-stage microwave irradiation offers a method to maintain interfacial effects in oil/water systems.
• Optimizing the second stage power is key to achieving sustained modification.
• This approach presents new opportunities for optimizing microwave applications in petroleum refining.