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Article
FTIR Study of Carbon Dioxide Interaction with some Room Temperature Ionic Liquids

Authors: Evon Akram --- Hadi M. A.Abood
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2014 Volume: 17 Issue: 4 Pages: 76-85
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Four ionic liquids were investigated for abilities to capture CO2 alone or with added catalyst at room temperature and atmospheric pressure. Hydrated aluminum nitrate Al (NO3)3.9H2O-urea with added CaO, hydrated ammonium aluminum sulfate NH4Al (SO4)2.12H2O-urea with added solid NaOH did not show in FTIR chart sign of either physical or chemical absorption of CO2, however hydrated ammonium aluminum sulfate NH4Al (SO4)2.12H2O-urea with added NaOHaq or few water showed a chemical absorption of CO2 at 1666 cm-1 as in aluminum chloride-urea ionic liquid while aluminum chloride-acetamide showed weaker or no ability to capture CO2.

تم دراسة اربعة انواع من السوائل الايونية لغرض دراسة قابليتها على امتصاص ثاني اوكسيد الكربون لوحدها او مع أضافة مواد محفزة كيميائيا عند درجة حرارة الغرفة والضغط الجوي. وقد وجد بأن السائل الايوني نترات الامونيوم الالمنيوم المائية – يوريا مع اضافة اوكسيد الكالسيوم او كبريتات الامونيوم الالمنيوم المائية – يوريا مع اضافة هيدروكسيد الصوديوم لم يظهر تغير في تحليل طيف الاشعة تحت الحمراء قد يشير الى وجود امتصاص ثاني اوكسيد الكربون بالطريقة الكيميائية او الفيزيائية. ولكن اظهر السائل الايوني كبريتات الامونيوم الالمنيوم المائية – يوريا مع اضافة هيدروكسيد الصوديوم المائي اظهر تغير في طيف الاشعة تحت الحمراء يشير الى وجود امتصاص كيمياوي لثاني اوكسيد الكربون. بالأضافة الى ذلك فقد وجد بأن السائل الايوني كلوريد الالمنيوم – يوريا ذو قابلية على امتصاص ثاني اوكسيد الكربون وقد اظهر طيف جديد عند 1655 cm-1 لطيف الاشعة تحت الحمراء. وكانت قابلية هذا السائل اكبر من قابلية السائل الايوني كلوريد الالمنيوم – اسيتامايد في قنص ثاني اوكسيد الكربون.


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.

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