Abstract




 
   

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

PDF URL: http://www.ije.ir/Vol30/No10/A/3-2588.pdf  
downloaded Downloaded: 110   viewed Viewed: 1399

  POPULATION BALANCE EQUATION MODELING OF CRUDE OIL DEMULSIFICATION CONSIDERING DEMULSIFIER: MODIFICATION OF COLLISION FREQUENCY FUNCTION BASED ON THERMODYNAMIC MODEL
 
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.

References   

1.      Meidanshahi, V., Jahanmiri, A. and Rahimpour, M.R., "Modeling and optimization of two stage ac electrostatic desalter", Separation Science and Technology,  Vol. 47, No. 1, (2012), 30-42.

2.      Cunha, R.E., Fortuny, M., Dariva, C. and Santos, A.F., "Mathematical modeling of the destabilization of crude oil emulsions using population balance equation", Industrial & Engineering Chemistry Research,  Vol. 47, No. 18, (2008), 7094-7103.

3.      Schuster, D., "Encyclopedia of emulsion technology: Basic theory, measurement, applications, CRC Press,  Vol. 3,  (1987).

4.      Marquez-Silva, R., Key, S., Marino, J., Guzman, C. and Buitriago, S., "Chemical dehydration: Correlations between crude oil, associated water and demulsifier characteristics, in real systems", in International Symposium on Oilfield Chemistry, Society of Petroleum Engineers., (1997).

5.      Venezuela, J.-L.S., "The fundamental basis for the action of a chemical dehydrant. Influence of the physical and chemical formulation on the stability of an emulsion", International Chemical Engineering,  Vol. 30, No. 1, (1990), 103-116.

6.      Bourrel, M., Salager, J., Schechter, R. and Wade, W., "A correlation for phase behavior of nonionic surfactants", Journal of Colloid and Interface Science,  Vol. 75, No. 2, (1980), 451-461.

7.      Al-Sabagh, A., Noor El-Din, M., Abo-El Fotouh, S. and Nasser, N., "Investigation of the demulsification efficiency of some ethoxylated polyalkylphenol formaldehydes based on locally obtained materials to resolve water-in-oil emulsions", Journal of Dispersion Science and Technology,  Vol. 30, No. 2, (2009), 267-276.

8.      Grimes, B., "Population balance model for batch gravity separation of crude oil and water emulsions. Part i: Model formulation", Journal of Dispersion Science and Technology,  Vol. 33, No. 4, (2012), 578-590.

9.      Grimes, B., Dorao, C., Opedal, N., Kralova, I., Sørland, G. and Sjöblom, J., "Population balance model for batch gravity separation of crude oil and water emulsions. Part ii: Comparison to experimental crude oil separation data", Journal of Dispersion Science and Technology,  Vol. 33, No. 4, (2012), 591-598.

10.    Atta, A.M., Al-Lohedan, H.A., Abdullah, M.M. and ElSaeed, S.M., "Application of new amphiphilic ionic liquid based on ethoxylated octadecylammonium tosylate as demulsifier and petroleum crude oil spill dispersant", Journal of Industrial and Engineering Chemistry,  Vol. 33, (2016), 122-130.

11.    Nikkhah, M., Tohidian, T., Rahimpour, M.R. and Jahanmiri, A., "Efficient demulsification of water-in-oil emulsion by a novel nano-titania modified chemical demulsifier", Chemical Engineering Research and Design,  Vol. 94, (2015), 164-172.

12.    Nagarajan, R. and Ruckenstein, E., "Theory of surfactant self-assembly: A predictive molecular thermodynamic approach", Langmuir,  Vol. 7, No. 12, (1991), 2934-2969.

13.    Zhang, X., Basaran, O.A. and Wham, R.M., "Theoretical prediction of electric field‐enhanced coalescence of spherical drops", AIChE Journal,  Vol. 41, No. 7, (1995), 1629-1639.

14.    Manga, M. and Stone, H., "Collective hydrodynamics of deformable drops and bubbles in dilute low reynolds number suspensions", Journal of Fluid Mechanics,  Vol. 300, (1995), 231-263.

15.             Kumar, S. and Ramkrishna, D., "On the solution of population balance equations by discretization—i. A fixed pivot technique", Chemical Engineering Science,  Vol. 51, No. 8, (1996), 1311-1332.


Download PDF 



International Journal of Engineering
E-mail: office@ije.ir
Web Site: http://www.ije.ir