جدول المحتويات

المجلة العراقية للهندسة الكيمياوية وهندسة النفط

ISSN: 19974884/E26180707
الجامعة: جامعة بغداد
الكلية: الهندسة
اللغة: Arabic and English

This journal is Open Access

حول المجلة

المجلة العراقية للهندسة الكيمياوية وهندسة النفط مجلة علمية فصلية تأسست في عام 2000 و تصدر عن كلية الهندسة في جامعة بغداد.
تتلقى المجلة العراقية للهندسة الكيمياوية وهندسة النفط البحوث العلمية في اختصاصات الهندسة الكيمياوية و هندسة النفط والمواضيع ذات الصلة.

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معلومات الاتصال

Aljadreah, Baghdad
Iraq
P.O Box: 47024
Phone: +964-1-7781506
Email: ijcpe@coeng.uobaghdad.edu.iq
ijcpe@yahoo.com

جدول المحتويات السنة: 2009 المجلد: 10 العدد: 1

Article
Prediction of bubble size in Bubble columns using Artificial Neural Network

المؤلفون: Nada Sadoon Ahmed zeki ندى سعدون احمد زكي
الصفحات: 1-8
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الخلاصة

In the literature, several correlations have been proposed for bubble size prediction in bubble columns. However these correlations fail to predict bubble diameter over a wide range of conditions. Based on a data bank of around 230 measurements collected from the open literature, a correlation for bubble sizes in the homogenous region in bubble columns was derived using Artificial Neural Network (ANN) modeling. The bubble diameter was found to be a function of six parameters: gas velocity, column diameter, diameter of orifice, liquid density, liquid viscosity and liquid surface tension. Statistical analysis showed that the proposed correlation has an Average Absolute Relative Error (AARE) of 7.3 % and correlation coefficient of 92.2%. A comparison with selected correlations in the literature showed that the developed ANN correlation noticeably improved the prediction of bubble sizes. The developed correlation also shows better prediction over a wide range of operation parameters in bubble columns.يوجد في الادبيات المنشورة عدد من الموديلات الرياضية التي تستعمل للتنبؤ بقطر الفقاعات في عمود الفقاعات ولكن تفشل هذه الموديلات عند تطبيقها لمدى واسع من الظروف المختلفة.ولهذا وبالاستناد الى عدد من المعلومات (بحدود 230) جمعت من الادبيات المنشورة,تم الحصول على موديل لقطر الفقاعة في المنطقة المتجانسة للبرج الفقاعي باستعمال الشبكة الاصطناعية الذكية.تم انتخاب مجموعة عوامل مؤثرة وتم تصنيفها الى ستة مجاميع لغرض استعمالها كمدخلات الى الشبكة.هذه العوامل هي:سرعة الغاز وقطر العمود وقطر الثقوب وكثافة السائل ولزوجة السائل والشد السطحي للسائل.لقد اثبت التحليل الاحصائي ان للموديل نسبة الخطأ AARE% تساوي 7.3 ومعامل ارتباط 92.2%.لقد تم المقارنة مع موديلات منتخبة في الادبيات وتبين بوضوح نجاح شبكة ال ANN في التنبؤ بقطر الفقاعات لمدى واسع من الظروف التشغيلية.

الكلمات الدلالية


Article
Nonlinear Adaptive Control of a pH Process

المؤلفون: Duraid Fadhel Ahmed --- Hameed Ali Omran Al-Anbari --- Salam K. Al-Dawery
الصفحات: 9-16
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الخلاصة

In this paper a nonlinear adaptive control method is presented for a pH process, which is difficult to control due to the nonlinear and uncertainties. A theoretical and experimental investigation was conducted of the dynamic behavior of neutralization process in a continuous stirred tank reactor (CSTR). The process control was implemented using different control strategies, velocity form of PI control and nonlinear adaptive control. Through simulation studies it has been shown that the estimated parameters are in good agreement with the actual values and that the proposed adaptive controller has excellent tracking and regulation performance.

الكلمات الدلالية


Article
Kinetic Study of Catalytic Hexane Isomerization

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الخلاصة

The isomerization of n-hexane on platinum loaded acidic zeolite was studied at atmospheric pressure, H2/nC6 molar ratios of 1-4 and temperature range of 240-270ºC. The measured kinetic data were fitted to an equation based on the bifunctional mechanism and by using independently obtained dehydrogenation and adsorption data. The activation energies of protonation (ΔHpro) and the elementary isomerization step (Eact,iso) and as well as the corresponding preexponential factor were simultaneously determined. The observed values of both ΔHpro and Eact,iso are in agreement with the results of quantum-chemical calculations.تم تحضير العامل المساعد 0.3wt%Pt/HY-zeolite بطريقة التحميل الرطب واستخدمت لازمرة الهكسان الاعتيادي.اجريت التجارب المختبرية بضغط جوي في منظومة ريادية تحتوي على مفاعل ذو الحشوة الثابتة وبدرجات حرارية تراوحت بين 240-270 °م وسرع فراغية 1-3 سا-1 والنسب المولية للهيدروجين الى الهكسان الاعتيادي 1-4. تم اشتقاق المعادلة العامة لسرعة التفاعل بالاعتماد على ميكانيكية ثنائية الدالة .استخدمت البيانات المتوفرة في الادبيات لحساب ثوابت التوازن لعملية الامتصاص وازالة الهيدروجين. ان قيمة طاقة التنشيط لتفاعل الازمرة هي 119.7 كيلو جول/مول في حين قيمة انثالبية تفاعل توليد البروتونات -79 كيلو جول/مول.

الكلمات الدلالية


Article
Extraction of atropine from Datura Innoxia using liquid membrane Technique

المؤلفون: Wasan O. Noori --- Adel al-Hemiri عادل احمد عوض
الصفحات: 23-27
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الخلاصة

Selective recovery of atropine from Datura innoxia seeds was studied. Applying pertraction in a rotating film contactor (RFC) the alkaloid was successfully recovered from native aqueous extracts obtained from the plant seeds. Decane as a liquid membrane and sulfuric acid as a stripping agent were used. Pertraction from native liquid extracts provided also a good atropine refinement, since the most of co-extracted from the plant species remained in the feed or membrane solution. Solid–liquid extraction of atropine from Datura innoxia seeds was coupled with RF-pertraction in order to purify simultaneously the extract obtained from the plant. Applying the integrated process, proposed in this study, a product containing 92.6% atropine was obtained.

الكلمات الدلالية

Extraction --- Liquid membrane --- Pertraction --- Atropine --- Purification


Article
The Factors Affecting the Absorption of Ozone in Water

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الخلاصة

This study was concerned with using ozone gas in drinking water treatment plant at Ibn-Sina Company. The main purpose of this research is to find the best contactor for ozone unit proposed. An investigation was conducted to study the absorption of ozone by water in two type of absorber. The effects of the process variables (such as height of water column, contact time, and pH) on the amount of ozone absorbed were investigated. Box-Wilson central composite rotatable design is used to design the experimental work for the mentioned variables. It was found that the optimum value of the variables studied was: i) Height of water column (90 cm) ii) Contact time (17-18 min) iii) PH (7 - 7.5)لقد اهتم هذا البحث بدراسة استخدام الاوزون في مجال معالجة مياه الشرب لصالح شركة ابن سينا العامة/وزارة الصناعة والمعادن العراقية.الهدف الرئيسي من هذا البحث هو ايجاد افضل الطرق لانتقال الاوزون للماء باستخدام نوعين من ابراج الامتصاص ,البرج الفقاعي وبرج ذو حشوة.تم دراسة عدة متغيرات هي ارتفاع عمود الماء في البرج ,زمن التماس ,والدالة الحامضية للماء المستخدم(PH). تم تحديد التجارب حسب طريقة (Box-Wilson Central Composite Rotatable Design) للمتغيرات المبينة اعلاه وقد وجد بان افضل امتصاص للاوزون يكون عند القيم التالية: 1- طول عمود الماء في البرج (90 سم). 2- زمن التماس (17-18 دقيقة). 3- الدالة الحامضية (7-7.5).

الكلمات الدلالية


Article
Purification of Zinc Oxide Using Direct Thermal Process by PetroleumCoke

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الخلاصة

The present investigation is concerned for the purification of impure zinc oxide (80-85 wt %) by using petroleum coke (carbon content is 76 wt %) as reducing agent for the impure zinc oxide to provide pure zinc vapor, which will be oxidized later by air to the pure zinc oxide. The operating conditions of the reaction were studied in detail which are, reaction time within the range (10 to 30 min), reaction temperature (900 to 1100 oC), air flow rate (0.2 to 1 l/min) and weight percentage of the reducing agent (petroleum coke) in the feed (14 to 30 wt %). The best operating conditions were (30 min) for the reaction time, (1100 oC) for the reaction temperature, (1 l/min) for the air flow rate, and (30 wt %) of reducing material (petroleum coke) in the feed. Under the above conditions, conversion of zinc oxide was (68.12 %) and the purity of the produced zinc oxide was (97.85 %) by using petroleum coke as reducing material.

الكلمات الدلالية


Article
Removal of Dyes from Wastewater of Textile Industries Using Activated Carbon and Activated Alumina

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الخلاصة

This work was carried to study the capability of activated alumina from bauxite compared with activated carbon adsorption capability to reduce the color content from Al-Hilla Textile Company wastewater. Six dyes were studied from two types(reactive and dispersed) namely (blue, red, yellow) from wastewater and aqueous solutions. Forty eight experiments were carried out to study the effect of various initial conditions (bed height, flow rate, initial concentration, pH value, temperature, and competitive adsorption) on adsorption process. The results showed that the adsorption process using activated carbon insured a good degree of color reduction reaching (99.7%) and was better than activated bauxite which reached (95%).

الكلمات الدلالية


Article
Kinetic Studies of Hydrodesulfurization of Vacuum Distillate

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الخلاصة

Vacuum gas oil (611-833)K was distilled from Kirkuk crude oil, which was obtained by blending the following fraction, 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 condition in a laboratory trickle bed reactor. The reaction temperature varied from (583-643)K over liquid hourly space velocity ranging between (1.5-3.75)h-1 , Hydrogen pressure was kept constant at 3.5 MPa with a hydrogen to oil ratio of about 250 L/L The conversion results for desulfurization appeared to obey the second order kinetics. According to this model rate constants for desulfurization reaction were calculated. Finally, the apparent activation energy (Ea), enthalpy of activation ( deltaH*) and entropy (delta S*) were calculated based on the values of rate constant (k). The calculated values of Ea, deltaH* and delta S* were 74.657 kJ/mole, 74.712 kJ/mole and 167.132 J/mole.k, respectively.

الكلمات الدلالية

جدول المحتويات السنة: 2009 المجلد: 10 العدد: 1