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Article
Modeling and Optimization on the Carbon Dioxide Separation from Natural Gas Using Hydrotalcite-Silica Membrane

Author: Ahmed Daham Wiheeb احمد دحام وهيب
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2018 Volume: 11 Issue: 3 Pages: 39-46
Publisher: Diyala University جامعة ديالى

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Abstract

The process modeling and optimization of carbon dioxide (CO2) separation from carbon dioxide-methane (CH4) binary gas mixture through hydrotalcite (HT)-silica membrane using statistical design of experiments (DoE) is reported in this study. The effect of three important process variables, pressure difference across the membrane (100-500 kPa), temperature (30-190oC) and CO2 feed concentration (10-50%) on the CO2 separation performance of the membrane were investigated. The response surface methodology (RSM) coupled with central composite design (CCD) was used to build up two models to correlate the effect of process conditions to CO2 permeance and CO2/CH4 separation selectivity. The analysis of variance (ANOVA) of the quadratic model at 95% confidence interval confirmed that the model was highly significant. The CO2 feed concentration with 43% showed the best performance with a CO2 permeance of 6.0x10-7 mol.m-2.s-1.Pa-1 and a CO2/CH4 separation selectivity of 109 at 100 kPa pressure difference across the membrane and temperature of 30oC.


Article
Kinetic Study of Carbon Dioxide Reaction with Binding Organic Liquids
دراسة ميكانيكية تفاعل ثاني اوكسيد الكاربون مع السوائل العضوية الملزمة

Authors: Sanaa Rabie Saleh --- Ahmed Daham Wiheeb
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2019 Volume: 26 Issue: 1 Pages: 26-32
Publisher: Tikrit University جامعة تكريت

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Abstract

Binding organic liquids are strong base of amidine have been used for CO2 capture. Up to now, there is no known datum on the reaction kinetics of CO2 with 1.5-Diazabicyclo [4.3.0] non-5-ene (DBN). In this paper, Kinetics of reaction between CO2 and DBN/MDEA in 1-Pentanol was performed utilizing the stirred cell reactor with DBN concentration (2 – 2.9 M) and at room temperature. The reaction path was qualified using zwitterion and the termolecular mechanism.From the kinetic datum with DBN concentrations (2 - 2.9 M), it was found that the capturing process happened in a fast reaction system with a second-order reaction kinetics of DBN/MDEA and first order with CO2. In addition, CO2 absorption was achieved using gas-liquid contact system. CO2 absorption rate was (2 × 10−5 − 2.8 × 10−5 kmol m2 ⁄ . sec) at DBN concentration (2 – 2.9 M). Finally, it is known that DBN/MDEA/1-Pentanol/CO2 system is easily switchable and can be used both CO2 capture and for other applications that require rapidchange of medium from nonionic to ionic liquid.


Article
Commercial CaO Catalyzed Biodiesel Production Process

Authors: Zaid Adnan Abdel-Rahman --- Ahmed Daham Wiheeb --- Marwa Majeed Jumaa
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2017 Volume: 20 Issue: 4 Pages: 846-852
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Biodiesel produced from vegetable oils is a good alternative clean diesel. The present study was conducted because there are some variations or contradictions in literature on the use of CaO heterogeneous catalyst. In this study, biodiesel was produced from sunflower vegetable oil and methanol in presence of commercial calcium oxide catalyst in batch mechanical stirrer reactor. The effect of three operating conditions, methanol mole ratio (4-12), reaction time (0.5-2.5 h) and catalyst amount (2-10 %), on the yield of biodiesel was studied at constant reaction temperature of 60 oC. Response surface methodology (RSM) was used with central composite design (CCD) of experiments. Polynomial correlation was found for the dependent variable of the process (yield of biodiesel), satisfactorily predicted at 95% confidence level. The optimum yield biodiesel was about 98% and at operating condition of methanol ratio 10, reaction time 2 h and catalyst amount 8 %. The reaction time was found to be the most effective operating condition. Kinetics study of the process showed that first order reaction with triglyceride concentration and zero order with methanol concentration gave best fit with the experimental data, triglyceride with a reaction rate constant k= 1.53 h-1.

البايوديزل المنتج من الزيوت النباتية خيار جيد لديزل نظيف . اجريت الدراسة الحالية لان هناك اختلافات او تناقضات في البحوث المنشورة على استعمال اوكسيد الكالسيوم كعامل مساعد غير متجانس. في هذه الدراسة , انتج البايوديزل من الزيت النباتي نوار الشمس مع الميثانول بوجود اوكسيد الكالسيوم التجاري كعامل مساعد في مفاعل دفعات بخلاط ميكانيكي. درس تاثير ثلاثة ظروف تشغيل ؛ نسبة المولية للميثانول (4-12) وزمن التفاعل (2,5 ساعة) وكمية العامل المساعد (2-10%) على انتاجية البايوديزل بثبوت درجة حرارة التفاعل 60 درجة مئوية. استخدمت طريقة استجابة السطوح (RSM) مع تصميم التجارب المركب المركزي (CCD) . تم ايجاد علاقة متعددة الحدود للمتغير المعتمد للعملية (انتاجية البايوديزل) , اعطت نتائج مقبولة في مستوى ثقة 95% . افضل انتاجية للبايوديزل بحدود 98% في ظروف تشغيلية ؛ النسبة المولية للميثانول (10) وزمن التفاعل (2 ساعة) وكمية العامل المساعد (8%). ووجد ان زمن التفاعل هو المتغير الاكثر تاثيرا لظروف التشغيل. بينت دراسة حركية العملية , ان تفاعل من الدرجة الاولى مع تركيز ثلاثي الكليسيرين ودرجة صفر مع تركيز الميثانول , اعطت افضل انطباق مع النتائج العملية , لثابت معدل التفاعل (k= 1.53 h-1).


Article
HYDROGEN PURIFICATION USING A MICROPOROUS HYDROTALCITE-SILICA COMPOSITE MEMBRANE

Authors: Ahmed Daham Wiheeb --- Abdul Mun’em A. Karim --- Taif Emad Mohammed --- Mohd Roslee Othman
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2015 Volume: 8 Issue: 4 Pages: 846-854
Publisher: Diyala University جامعة ديالى

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Abstract

A novel thin microporous composite membrane of a dual-element hydrotalcite-silica was prepared on porous alumina support by sol-gel method. Strong CO2 adsorption on hydrotalcite material inhibited the diffusion of H2 through the membrane and decreased H2 permeances significantly so that CO2 preferentially permeated. The effects of pressure difference across the membrane, operating temperature and CO2 feed concentration on the CO2 separation performance of the membrane were investigated using synthetically mixed gas. The CO2 permeance and CO2/H2 separation selectivity decreased with increasing the temperature due to the loss of the membrane ability for CO2 adsorption with temperature. Further increase of the pressure difference across the membrane decreased both CO2 permeance and CO2/H2 separation selectivity. The CO2 feed concentration with 40% showed the best performance with a CO2/H2 separation selectivity of 10.59.

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