Removal of oil from synthetic heavy crude oil-in-water emulsions by the association of glass raschig rings and ultrasound
As a byproduct of the crude oil industry, oily water is a major environmental concern. In this study, a novel methodology that used low-frequency ultrasound (US) for the removal of oil from the production of oily water was proposed. A continuous phase was prepared by dissolving NaCl (18 g·L −1 ), Ca...
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Published in | Journal of dispersion science and technology Vol. 43; no. 1; pp. 22 - 32 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Philadelphia
Taylor & Francis
02.01.2022
Taylor & Francis Ltd |
Subjects | |
Online Access | Get full text |
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Summary: | As a byproduct of the crude oil industry, oily water is a major environmental concern. In this study, a novel methodology that used low-frequency ultrasound (US) for the removal of oil from the production of oily water was proposed. A continuous phase was prepared by dissolving NaCl (18 g·L
−1
), CaCl
2
(6 g·L
−1
), and MgCl
2
(3 g·L
−1
) in water. Synthetic oil-in-water emulsion was without adding artificial emulsifiers (oil contents: 495-687 mg·dm
−3
) with median droplet size distributions of approximately 10 µm was prepared using a Brazilian heavy crude oil (API gravity of 11.9). Experiments were performed using ultrasonic baths operating at 35, 45, and 130 kHz at 60 °C in the presence of glass Raschig rings without any addition of chemical demulsifiers. Other materials were also evaluated: PVC; PTFE; Polypropylene; steel; and copper. For the synthetic oil-in-water emulsion with 495 mg·dm
−3
oil, in the presence of glass Raschig rings, an oil removal efficiency of approximately 76.4% (35 kHz, 20 min) was achieved. Higher removal efficiencies were obtained for synthetic oil-in-water with 495 mg·dm
−3
oil than for those with 687 mg·dm
−3
oil (50.1%, 130 kHz, 20 min). Although typically used for emulsification, these findings reveal that low-frequency US association of glass Raschig rings is also a promising technology for treating the produced water to remove oil. |
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ISSN: | 0193-2691 1532-2351 |
DOI: | 10.1080/01932691.2020.1813155 |