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Article
Carbon Dioxide Absorption in Packed Column inNon-Newtonian Fluid
امتصاص ثاني اوكسيد الكاربون بواسطة سائل غير نيوتوني في برج امتصاص

Authors: Fadhil Hashim Farje --- Alyaa Khadhier Mageed --- Dr.Farah Talib Jasim
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2010 Volume: 17 Issue: 3 Pages: 13-21
Publisher: Tikrit University جامعة تكريت

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Abstract

Absorption of carbon dioxide into carbonate solution (Na2CO3) with PAM (non-Newtonian fluid) has been performed in a countercurrent packed column (0.075m i.d. *1.25 m height) packed with glass Raschig rings ( 1*1cm) to a depth of 1m. The influence of liquid flow rate, gas flow rate, liquid temperature, and polyacrylamind (PAM) concentration on the absorption rate, overall mass transfer coefficient and the reaction kinetics regime are studied at constant carbonate concentration and atmospheric pressure. The results show that the absorption rate and overall mass transfer coefficient increases with increasing liquid flow rate and temperature. The mass transfer coefficient decreases with increasing gas flow rate while the absorption rate of carbon dioxide is virtually independent of gas flow rate. This indicates that carbon dioxide absorption is liquid film controlled. Increasing PAM concentration results of reduction of absorption rate and overall mass transfer coefficient. The reaction kinetics between carbon dioxide and carbonate solution with PAM was obtained as a pseudo first order reaction (Hatta number ,Ha >>1).
Keywords: carbon dioxide absorption, non-Newtonian fluid, mass transfer

Keywords


Article
Hydrodynamics in a Trickle Bed Reactor
دراسة عملیة لھایدروداینمك مفاعل الطبقة الوشلة

Authors: Muhammad Fadel Abd --- Farah Talib Jasim --- Luma Shihab Ahmed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 15 Part (A) Engineering Pages: 2860-2875
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Experimental investigations have been carried out to study the performance oftrickle bed reactor. The effect of key parameters that play predominate role in theperformance of trickle bed reactor was studied. A laboratory unit was constructedfor this purpose where a versatile reactor setup required " high pressure stainlesssteel reactor of 0.05m i.d × 1.25m height", in which the hydrodynamicexperiments carried out under different operating condition namely, superficial gasvelocity and liquid velocity , reactor pressure, bed temperature .Air–water systemwas used for hydrodynamic experiments pressure drop, dynamic liquid holdup, andaxial dispersion coefficients were estimated. The results also show that thedynamic liquid holdup increases with increasing liquid velocity and decreaseswith increasing superficial gas velocity and bed temperature. Axial dispersiontends to increase with increasing superficial gas and liquid velocities while itdecreases with increasing bed temperature.


Article
Removal of Phenols from Refinery Wastewater using Trickle Bed Reactor
ازالة الفينول من مياة الصرف للمصافي النفطية باستخدام مفاعل الطبقة الوشلة

Authors: Muhammad Fadel Abd --- Farah Talib Jasim --- Luma Shihab Ahmed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 18 Part (A) Engineering Pages: 147-160
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The present work aims to study the performance of a trickle bed reactor for phenol degradation in refinery wastewater by investigating the applicability of a commercial 0.5% platinum/alumina catalyst, which is used currently for desulfurization process in the North Refinery Company-Iraq. Synthetic wastewater experimentally was prepared to simulate the specification of samples taken from North Company Refinary. Results showed that initial phenol concentration had adverse effect on phenol removal. The results exhibited that the highest phenol conversion of (98.47%) was obtained over 0.5% Pt/γ-Al2O3 at the studied conditions (i.e., operating pressur 0.8 Mpa, operating temperature 1200C, LHSV 2.5 h-1, and air superficial velocity 0.25 m/s), with initial phenol concentration of 200 mg/L. The present method characterized by low residence time, the end-products are environmantally harmless no sludge production which requires further treatment

تضمن البحث دراسة كفاءة اداء عمود الطبقة الوشلة لازالة الفينول من مياه الصرف للمصافي النفطية بأستخدام %Pt/Al2O30.5 كعامل مساعد والمستخدم حاليا في وحدة ازالة الكبريت " desulfurization process " في مصافي الشمال. النتائج أظهرت ان اعلى نسبه تحول للفينول ((98.47 تم الحصول عليه تحت الظروف التاليه (LHSV 2.5 سا-1, درجة حرارة=120 م°, الضغط التشغيلي =0.8 ميكاباسكال والتركيز الأبتدائي للفينول=200 مغم/لتر وسرعة الغاز 0.25 m/s). وان النواتج النهائية في هذه الطريقة المستخدمة في البحث لا تحتاج الى معالجات اضافية اخرى.


Article
STUDY ON HETEROGENEOUSL CATALYZED TRANSESTERIFICATION REACTION

Authors: Abdullah Nizar SAEED --- Farah Talib Jasim AL-SUDANI
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2017 Volume: 10 Issue: 4 Pages: 620-628
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

The commercial process of heterogeneously catalyzed biodiesel production process is in its final steps due to its advantages over the old homogeneously catalyzed one, and in order to provide an economic and fast way to investigate the vegetable oil conversion into biodiesel, a relation between conversion and a parameter that can be easily measured like viscosity is developed in this paper. The variation of viscosity with increasing conversion was proved to be exponential.an equation was developed to predict conversion from dynamic viscosity values based on the experimental data. A conversion of 91% was obtained at 60 oC reaction temperature, 12:1 methanol to oil molar ratio, 600 rpm in 2 hours of reaction time. The method reported in this paper is meant to save time and money since the most widely used chromatography methods are expensive and time consuming.

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