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Article
Kinetic and Mechanism of Oxidation of Oxalic Acid by Cerium (IV)
حركية وميكانيكية اكسدة حامض الاوكزاليك بواسطة السيريوم الرباعي

Author: Dr. Ammar J. Mohammed عمار جاسم محمد
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2005 Volume: 1 Issue: 1 Pages: 125-133
Publisher: Baghdad University جامعة بغداد

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Abstract

Kinetic and mechanism studies of the oxidation of oxalic acid by Cerium sulphate have been carried out in acid medium sulphuric acid. The uv- vis. Spectrophotometric technique was used to follow up the reaction and the selected wavelength to be followed was 320 nm. The kinetic study showed that the order of reaction is first order in Ce(IV) and fractional in oxalic acid. The effect of using different concentration of sulphuric acid on the rate of the reaction has been studied a and it was found that the rate decreased with increasing the acid concentration. Classical organic tests was used to identify the product of the oxidation reaction, the product was just bubbles of CO2.

تم دراسة حركية وميكانيكية اكسدة حامض الاوكزاليك في الوسط الحامضي من حامض الكبريتيك . استخدمت تقنية الاشعة فوق البنفسجية- المرئية لمتابعة التفاعل عند الطول الموجي 320 nm . بينت الدراسة الحركية ان التفاعل من المرتبة الاولى بالنسبة للسيريوم الرباعي والمرتبة الكسرية بالنسبة لحامض الاوكزاليك .تم دراسة تأثير تغيير تركيز حامض الكبريتيك على سرعة التفاعل ووجد ان سرعة التفاعل تقل بزيادة تركيز حامض الكبريتيك تم استخدام الكشوفات العضوية الاولية لتشخيص ناتج الاكسدة ووجد ان ناتج التفاعل هو عبارة عن فقاعات غاز ثاني اوكسيد الكاربون.

Keywords

Cerium --- IV --- Kinetics --- Oxidation --- Oxalic Acid.


Article
Monte Carlo Simulation of Electronic Kinetics in Gas Discharge

Authors: A.B. Kadhem --- B.H. Hamad
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 3 Pages: 3-5
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The phenomenon of electrical gas discharge is present in manyapplications of plasma physics. Calculation of electrons motion tracingin gases are described. The backscattering probability of electrons tothe cathode has been estimated for values of E/P0 ratio from 10 to 200V.cm-1.torr-1 and for emission energies up to the lowest excitationpotential. The primary ionization coefficients and drift velocities wereevaluated for values of E/P0 ratio from 20 to 400 V.cm-1.torr-1. Theequilibrium of swarm with the field was considered in detail. It isshown that for uniform fields, deviations from exponential growth ofcurrent with increasing electrode separation occur if the interelectrodevoltage is not at least three times the mean energy ofelectrons impinging on the anode.


Article
Investigation of Amorphous to Crystalline Transition in Glassy Se80Te20 and Se70Te20M10 (M = Ag, Cd, Sb) Alloys

Authors: N. Mehta --- A. Kumar
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 3 Pages: 7-13
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Calorimetric measurements have been performed in binary Se80Te20 and ternary Se70Te20M10 (M=Ag, Cd, Sb) alloys to study the effect of metallic additives (Ag, Cd, Sb) on the crystallization kinetics in Se80Te20 alloy. Three different non-isothermal methods Kissinger’s method, Matusita-Sakka theory and Augis-Bennett approximation method have been used in the present study. Different kinetic parameters such as the activation energy of crystallization (EC), the order parameter(n), the growth morphology parameter (m), the rate constant (K) and its frequency factor (Ko) have been determined. The effect of third element on crystallization temperature of binary Se80Te20 is explained in terms of Arrhenius dependence of rate constant K(T). The increasing sequence of activation energy of crystallization in ternary Se70Te20M10 (M=Ag, Cd, Sb) alloys is explained in terms of their average bond strength.


Article
Hydro-De-Aromatization of Paraffin Wax

Authors: Suondos K. A. Barno --- Ammar S. Abbas
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2005 Volume: 11 Issue: 4 Pages: 715-723
Publisher: Baghdad University جامعة بغداد

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Abstract

Iraqi paraffin wax (1.0 wt% aromatic content and 4.4 wt% oil content, Basrah origin) was hydrotreated over commercial Pt-Re/y-Al2O3 catalyst in order to study aromatic removal reaction (de-aromatization) kinetics. Reaction temperature varied from 453 to 533 K over a liquid hourly space velocity from 0.5 to 4.2 h-1. Hydrogen pressure was kept constant throughout all the experiments at 3.6 Mpa with hydrogen to wax ratio about 400 m3/m3. Kinetics analysis showed that the hydro-de-aromatization reaction followed a second order kinetics model. Energy, enthalpy and entropy of activation of hydro-de-aromatization reaction were 17.2 kJJ/mole, 13.1 kJ/mole and -16.9 J/mole K, respectively.

تم هدرجة شمع برافينى عراقي المنشأ (ناتج من عملية تكرير نفط البصرة) ذو محتوى زيتي 4.4 % وزناً و 0.1 % وزناً مواد اروماتية بأستعمال عامل مساعد Pt-Re/y-Al2O3 وذلك لدراسة حركية تفاعل ازالة المواد الاروماتية. تراوحت درجة حرارة التفاعل بين 453 و 533 كلفن و سرعة سائل فراغية بين 0.5 و 4.2 ساعة-1. ثبت ضغط الهيدروجين المستعمل و لكل التجارب بمقدار 3.6 ميكا باسكال و نسبة هيدروجين الى شمع 400 م3/م3. اشارت النتائج الى ان موديل حركية التفاعل هي من الدرجة الثانية و كانت مقدار طاقة التنشيط للتفاعل 17.2 كيلو جول مول و انثاليبية التنشيط 13.1 كيلو جول / مول و انتروبية التنشيط - 16.9 جول / مول كلفن.

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