Banca de DEFESA: SÉRGIO ROMERO GALVÃO SALES JÚNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : SÉRGIO ROMERO GALVÃO SALES JÚNIOR
DATE: 30/03/2026
TIME: 14:30
LOCAL: Online
TITLE:

Emulsion Synthesis Using Different Benchtop Ultrasonic Homogenizers

KEY WORDS:

produced water; emulsion; ultrasound; acoustic cavitation; stability

PAGES: 79
BIG AREA: Engenharias
AREA: Engenharia de Energia
SUMMARY:

In oil production, one of the main liquid effluents generated is produced water, composed predominantly of formation water and/or injection water that returns to the surface during production, containing dispersed oil, suspended solid particles, dissolved salts, and other organic and inorganic compounds. This system often presents itself in the form of emulsions that are difficult to separate. Reinjection of these emulsions can cause operational problems, such as reduced injection capacity due to formation damage (reduced absolute permeability). Therefore, studying the behavior of these emulsions, even under controlled laboratory conditions, is fundamental to understanding their effects on oil production operations. In this context, this work aimed to evaluate the influence of different ultrasonic homogenizers and their operational parameters on the formation and stability of emulsions that simulate produced water. To this end, emulsions were synthesized under controlled laboratory conditions using high-purity water, NaCl, NaOH, and petroleum, based on the ultrasound-assisted emulsification (UAE) technique. Three benchtop ultrasonic homogenizers classified as high-intensity ultrasound (HIU) were evaluated: UP400St (Hielscher), EcoSonics (Ultronique), and BH-2000Q (Sino Sonics). The tests aimed to correlate operational parameters of the equipment (such as power, amplitude, sonication time, operating mode, and sample volume) with emulsion stability and droplet size distribution. The best results were obtained in continuous sonication mode, with high intensity (power or amplitude) and a processing time of around 40 minutes for volumes up to 500 mL. Under these conditions, unimodal distributions with an average droplet diameter of less than 10 µm were obtained. For larger volumes (2 L), a reduction in emulsification efficiency was observed, indicating the need for operational adjustments or complementary strategies to maintain emulsion quality.

COMMITTEE MEMBERS:
Presidente - 1288120 - ADRIANO DOS SANTOS
Externo ao Programa - 1213158 - ANDRE ANDERSON COSTA PEREIRA - nullExterna ao Programa - 1415919 - KATHERINE CARRILHO DE OLIVEIRA DEUS - nullExterna à Instituição - TAMYRIS THAISE COSTA DE SOUZA - UNIFESSPA