IJE TRANSACTIONS A: Basics Vol. 30, No. 10 (October 2017) 1434-1442    Article in Press

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N. Roshan, S. Ghader and M. R. Rahimpour
( Received: April 26, 2017 – Accepted in Revised Form: July 07, 2017 )

Abstract    A theoretical model is developed to consider the effect of demulsifier agent on demulsification of water-in-crude oil emulsion. A thermodynamic approach is considered to correlate the critical micelle concentration of a demulsifier to the collision frequency function in population balance equation (PBE). Based on the proposed correlation, the collision frequency function is modified to account the effect of demulsifier agent on water droplets coalescence. The water separation capability of a selected group of demulsifiers is investigated via the conventional bottle test method to obtain the adjustable parameter of the developed equation so that the absolute relative error of predicted demulsification efficiency and experimental data are considered as objective. Comparison between the model simulated results and the experimental data showed that the proposed model could appropriately reproduce the experimental data at different agent concentrations.


Keywords    Demulsifier, CMC, Population balance equation, Collision frequency.


چکیده    در این مقاله، مدلی تئوری به منظور بررسی اثر مواد تعلیق­شکن بر روی راندمان جداسازی آب از امولسیون نفت خام پیشنهاد داده شده است. بر اساس اصول تعادل ترمودینامیکی، رابطه­ای بین غلظت بحرانی مواد تعلیق­شکن با تابع فرکانس برخورد در معادله موازنه جمعیت، ارائه داده شده است. بر اساس رابطه پیشنهادی، تابع فرکانس برخورد به­نحوی تصحیح شده است که تاثیر مواد تعلیق­شکن در به­هم چسبیدن قطرات آب در نظر گرفته شود. به منظور تعیین پارامتر تنظیم شدنی مدل پیشنهاد داده شده، گروهی از مواد تعلیق­شکن در نظر گرفته شده و با انجام آزمایش­های بطری کارایی آن­ها در جداسازی آب از نفت، از طریق محاسبه خطای مطلق نسبی بین نتایج راندمان جداسازی آب حاصل از مدل پیشنهادی و نتایج داده­های آزمایشگاهی، بررسی شده است. مقایسه بین نتایج حاصل ازشبیه سازی و نتایج آزمایشگاهی، مناسب بودن مدل را در پیش بینی راندمان جداسازی قطرات آب از امولسیون نفت خام در غلظت­های مختلف تعلیق­شکن، به­خوبی نشان می­دهد.


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