کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
592434 1453907 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetic demulsification of diluted crude oil-in-water nanoemulsions using oleic acid-coated magnetite nanoparticles
ترجمه فارسی عنوان
جداسازی مغناطیسی نانو امولسیون های نفت خام در آب با استفاده از نانوذرات مغناطیسی پوشش داده شده با اسید اولئیک
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
چکیده انگلیسی


• Oleic acid-coated magnetite nanoparticles are a potential magnetic demulsifier.
• The demulsifier can magnetically break diluted crude oil-in-water nanoemulsions.
• The demulsification efficiency of the demulsifier is influenced by its wettability.
• Multistep demulsification shows a higher efficiency than the single-step operation.
• The magnetic demulsifier exhibits a good reusability.

Most produced crude oil and oily wastewater from oilfields typically exist in the form of emulsions; this makes their demulsification a very challenging process. Chemical demulsifiers are commonly employed to enhance demulsification efficiency (ED). However, there is still an urgent need to develop more efficient techniques and demulsifiers to meet eco-friendly and economically competitive requirements. In this study, magnetic demulsification of single-layer oleic acid-coated magnetite (Fe3O4@OA) nanoparticles as a demulsifier for cyclohexane-diluted crude oil-in-water nanoemulsions (denoted as CO-NEs) was investigated under an external magnetic field. The effects of the dosage and wettability of the demulsifier, the pH of the CO-NEs, and the demulsification operation process on the ED were examined. The ED increased with increasing Fe3O4@OA dosage and a high ED of ∼97% was reached, which demonstrates the potential of Fe3O4@OA nanoparticles as a magnetic demulsifier for crude oil-containing emulsions from oilfields. The ED is related to the wettability (or water contact angle) of the magnetic nanoparticles, and a maximum ED was observed at a water contact angle of ∼90°. The ED was almost unchanged in the pH range of 4.0–7.5, while it gradually decreased as the pH rose from 8.0 to 11.0. Multistep demulsification exhibited a higher ED than the single-step operation when the same amounts of demulsifier were used. The Fe3O4@OA nanoparticles exhibited good recyclability; no significant change in the ED of the recycled Fe3O4@OA after demulsification was observed over five cycles. This work improves the understanding of demulsification behaviors of magnetic demulsifiers.

Single-layer oleic acid-coated magnetite (Fe3O4@OA) nanoparticles show potential for magnetically demulsifying diluted crude oil-in-water nanoemulsions from oilfields. The demulsification efficiency was influenced by the dosage and wettability of the nanoparticles, the pH and the demulsification operation process.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 466, 5 February 2015, Pages 197–202
نویسندگان
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