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STUDYING THE PERFORMANCE OF A HYDRO TREATING PROCESS FOR A MIXTURE OF GAS OIL AND LIGHTER FRACTIONS

Authors: Mohammad F. Abid --- Waleed H. Abohameed --- Shakir M. Ahmed --- Salah M. Ali --- et al.
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2017 Volume: 10 Issue: 4 Pages: 468-485
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

In the present study the applicability of hydrodesulfurization of a mixture of crude oil fractions (e.g., naphtha, kerosene, and gas oil ) in a single hydrotreating reactor packed with NiCoMo/Al2O3 under various operating parameters such as temperature (310-370 oC), pressure (40-55 bars), weight hour space velocity (1.2 to 3.6 h-1), and hydrogen-to- liquid hydrocarbon ratio (150-300 vol/vol). Experimental results showed that temperature and pressure have a positive effect on process performance while weight hour space velocity gives a different trend. The optimum value of (H2/Hydrocarbon) ratio was found experimentally to be 200 vol/vol after which the increase in this ratio cause reduction in HDS% because decrease in contact between H2 gas and Hydrocarbon in reactor. Results showed that the best conditions (350 oC, 50 bars, 1.2 h-1, and 200 vol/vol) in which gave the hydrotreating (HDS) efficiency of 95.8%.The results confirmed the applicability of the NiCoMo/Al2O3 catalyst for HDS reaction of a mixture of middle distillate (e.g., naphtha, kerosene, and gas oil). It was found that at higher pressure and temperature (i.e., T> 350 oC; P> 50 bars) a thermodynamic equilibrium was established. As observed, there is a 1.6% reduction in gas oil less than that of the conventional method. However, kerosene, heavy naphtha, and light naphtha undergo increases of 0.6%, 0.75%, and 2.75% respectively over these from conventional method. These results reveal that the quantity of fractions is almost the same for both methods. As it can be observed, that measured properties of the oil fractions produced by the proposed method are almost the same as those produced by conventional method. However, specific gravity (sp.gr) of the oil cuts produced by present study (i.e. sp.gr of kerosene, heavy naphtha, and light naphtha 0.785, 0.728, 0.655 respectively) is somewhat less than sp.gr of the same fractions produced by conventional methods (i.e. sp.gr of kerosene, heavy naphtha, and light naphtha 0.788, 0.738, 0.65 respectively), which gives a clear indication of properties improvement of these fractions. Experimental results confirmed the applicability of the proposed method for HDS of a mixture of Iraqi middle distillates (i.e., naphtha, kerosene, and gas oil) simultaneously in a single fixed bed reactor


Article
Evaluation and Comparison between Crude Oil Straight Run Fractions and Its Commercial Fractions (Gasoline, Kerosene and Gas Oil) at Dura Oil Refinery

Author: Wedad H. Al-Dahhan
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2016 Volume: 19 Issue: 3 Pages: 18-27
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Atmospheric distillation according to ASTM-D 2892 and ASTM-D 86 distillation methods was carried out to one selected crude oil at Dura oil refinery. Its straight run fractions (Gasoline, Kerosene and Gas Oil) were tested using the physical properties: Boiling point, Density, Pour point, Surface tension and Aniline point in addition to the calculated results: API gravity, Kw factor and Correlation index to make a comparison with commercial fractions (refinery final products): Gasoline, Kerosene and Gas Oil. A special distillation curves were obtained for crude oil to determine the straight run fractions and for the commercial fractions to establish their characteristics and support the preliminary results of the physical properties with valuable data which enhanced the comparison. Distillation of commercial gasoline shows that it is heavier than straight run ones, while there were matching in the characteristics for kerosene. Commercial gas oil was lighter than straight run due to the presence of kerosene.

تم اختيار احد النفوط الخام من مصفى الدورة واجراء التقطير عليه بموجب الطريقة (ASTM-D2892) للحصول على المشتقات النفطية الرئيسية محور البحث (كازولين، كيروسين وكاز اويل).اجريت عمليات تقطير على نماذج من المشتقات النفطية التجارية (منتج نهائي من مصفى الدورة) بموجب الطريقة (ASTM-D86).المشتقات النفطية المستحصلة من تقطير النفط الخام مع المشتقات التجارية اجريت عليها الفحوصات الفيزيائية: درجة الغليان، الكثافة، درجة الانسكاب، الشد السطحي ودرجة الانلين اضافة الى الخواص التي تم حسابها (Kw,API,CI) للوقوف على نقاط الاختلاف والمقارنة بينهما.تمت الاستعانة بمنحنيات التقطير للنفط الخام والمشتقات النفطية لدعم النتائج المستحصلة من الخواص الفيزيائية.تبين من خلال المقارنه بين المشتقات التجارية طي البحث والمنتجات المستحصلة مباشرة من عملية التقطير ان الكازولين التجاري اثقل من المقطر بينما تطابقت النتائج بالنسبة للكيروسين وعلى عكس الكازولين فان الكاز اويل التجاري كان اخف من الكاز اويل المنتج مباشرة من عملية التقطير.

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