معالجة الماء من حقول النفط باستخدام محاليل ايونية في منظومة التعويم بالهواء المذاب == Treatment of Oilfield Produced Water Using Ionic Liquids In A Dissolved Air Flotation System
Author name:
اوس عباس فاضل
Supervisor name:
سوسن عبد مسلم محمد | سعدي كاظم عبد الحسين
General topic:
Chemical Engineering
Specific topic:
Chemical Engineering
Degree:
Master
University:
University of Baghdad - College Of Engineering - Department Of Chemical Engineering
Language:
English
University location:
Baghdad
First pages:
38T291 - p.pdf
Abstract:
في العراق معدل تراكيز الزيوت والشحوم (OG) في الماء المنتج يجب الا يتجاوز 09 ملغم\لتر. ولذلك فانه يتطلب معالجة المياه المنتجة بغية تلبية الحد التنظيمي للتصريف مسبقا.تم جلب نماذج الماء المنتج الخام من شركة نفط الوسط ) Md.O.C ( من الحقول النفطية من شرق بغد | In Iraq the average Oil and Grease (OG) in water concentration in discharge produced water must not exceed 10ppm. Therefore treatment of produced water is required in order to meet the pre - disposal regulatory limit.Raw produced water samples were procured from the Middle oil company (Md.O.C) (from East of Baghdad fields).Jar tests experiments were used to give a first, rough estimation for coagulants dosage of Ferric chloride and aluminum sulfate and pH values that will be used in the batch Dissolved Air Flotation (DAF) experiments. Then, the effects of the three ionic liquids (ILs) types; 1 - hexyl - 3 - methylimidazolium tetra fluoroborate (ILE), 1 - hexyl - 3 - metylimidazolium hexafluorophosphate (ILF) and 1 - octyl - 3 - methylimidazolium tetra fluoroborate (ILG) on the performance of the batch DAF unit were evaluated.It was concluded that, the beast operating conditions of the batch DAF unit were at a saturation pressure of 5 bar, recycle ratio of 50% and ambient temperature of 30 - 35 ?C. Ferric chloride with a dosage of 10 ppm was chosen as the suitable coagulant due to its low sensitivity to pH change, and its high removal efficiency for oil and turbidity in about ten minutes. ILs were used at concentration of 50 ?l per one liter of treated produced water. It was used in two positions of the DAF system; the saturation vessel and the treatment tank. The OG removal efficiency using ILG as an efficient surfactant in saturation vessel was higher than that in the treatment tank and higher than other ILs (ILG>ILF>ILE). The highest demulsification rates were obtained through saturation pressure range (2 - 5) bar. It reached about 90% removal efficiency at a pressure of 5 bar, and it was obtained 85% at saturation pressure of 3 bar which reduces the operation costs. The treated water concentration at 3bar was 9.5 ppm which meets the Iraqi pre - disposal regulatory limit.The results of testing the three ILs (ILE, ILF and ILG) in the saturation vessel and the treatment tank were used to produce contour line for the OG removal efficiency. This was conducted in order to detect the performance of the three ILs The results of optical microscope which was used to study coalescence of oil droplets in water phase, lead to consider the ILG as an effective demulsifier for Iraqi oil field produced water It was noted that the use of ILs in saturation vessel allowed micro bubble generation at operating pressures lower than 3 bar with high - energy savings.
