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THERMODYNAMIC MODEL FOR HIGH PRESSURE PHASE BEHAVIOR OF CARBON DIOXIDE IN SEVERAL PHYSICAL SOLVENTS AT DIFFERENT TEMPERATURES
نمذجة في ديناميك الحرارة للسلوك الطوري لثاني أوكسيد الكاربون مع بعض المذيبات الفيزيائية السائلة لدرجات حرارة مختلفة (عند الضغوط العالية)

Author: Dr. Abdul Mun'em A. Karim Arkan Jasim Hadi
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2008 Volume: 15 Issue: 2 Pages: 32-49
Publisher: Tikrit University جامعة تكريت

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Abstract

In the present study a thermodynamic model for prediction of gas-liquid equilibrium at high pressures and different temperatures prepared for the binary systems of carbon dioxide (1) with each of the one of the liquid physical solvents (2) (sulfolane, n-methyl-2-pyrrolidone and propylene carbonate) using Peng-Robenson equation of state (PR-EOS) with different mixing rules to show the effect of the type of mixing rule used. Comparison of the experimental phase equilibrium data in the literature with the results of the model showed very good representation for some mixing rules and good for the others.

تم إعداد نموذج لاتزان غاز-سائل للأنظمة الثنائية في الضغوط العالية وعند درجات حرارة مختلفة لثاني أوكسيد الكاربون بثلاث مذيبات سائلة ( سولفولان ونورمل مثيل بايروليدون وبروبيلين كاربونيت ) بإستعمال معادلةَ بنك-روبنسون للحالة وقوانين خلط(mixing rules) مختلفة . قورنت نتائج النموذج مع نتائج تجريبية تم الحصول عليها من المصادر والبحوث وقد تبين بان النموذج يعطي توافقا جيد جدا لبعض قوانين الخلط وجيد نوعا ما للبعض الآخر.


Article
KINETIC MODELS STUDY OF HYDRODESULPHURIZATION VACUUM DISTILLATE REACTION
دراسة نماذج حركية تفاعل المعاملة الهيدروجينية لنزع الكبريت من زيت الغازالفراغي المتقطر

Authors: Hiadar A. Areff --- Dr. Abdul Mun'em A. Karim --- Dr. Abdul Halim A. Mohammed
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2009 Volume: 16 Issue: 1 Pages: 1-14
Publisher: Tikrit University جامعة تكريت

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Abstract

This study deals with kinetics of hydrodesulphurization (HDS) reaction of vacuum gas oil (611-833) K which was distillated from Kirkuk crude oil and which was obtained by blending the fractions, light vacuum gas oil (611 - 650) K, medium vacuum gas oil (650-690) K, heavy vacuum gas oil (690-727) K and very heavy vacuum gas oil (727-833) K.
The vacuum gas oil was hydrotreated on a commercial cobalt-molybdenum alumina catalyst presulfied at specified conditions in a laboratory trickle bed reactor. The reaction temperature range (583-643) K,liquid hourly space velocity range (1.5-3.75) h-1 and hydrogen pressure was kept constant at 3.5 MPa with hydrogen to oil ratio about 250 lt/lt.
The conversion results for desulphurization reaction appeared to obey the second order reaction. According to this model, the rate constants for desulphurization reaction were determined. Finally, the apparent activation energy (Ea), enthalpy of activation ( H*) and entropy ( S*) were calculated based on the values of rate constant (k2) and were equal 80.3792 KJ/mole, 75.2974 KJ/mole and 197.493 J/mole, respectively.

KEY WORDS: Hydrodesulphurization reaction, Vacuum gas oil, Trickle bed reactor, Reaction kinetics models.

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