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Article
Extraction of Phenol from Aqueous Solutions Using Bulk ionic Liquid Membranes

Authors: Sawsan A.M. Mohammed --- Mohammed Saadi Hameed
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2016 Volume: 17 Issue: 1 Pages: 83-97
Publisher: Baghdad University جامعة بغداد

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Abstract

Room temperature ionic liquids show potential as an alternative to conventional organic membrane solvents mainly due to their properties of low vapour pressure, low volatility and they are often stable. In the present work, the technical feasibilities of room temperature ionic liquids as bulk liquid membranes for phenol removal were investigated experimentally. In this research several hydrophobic ionic liquids were synthesized at laboratory. These ionic liquids include (1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide[Bmim][NTf2], 1-Hexyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide[Hmim][NTf2], 1-octyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide[Omim][NTf2],1‐butyl‐1‐methylimidazoliumhexafluorophosphate[Bmim][PF6], 1‐hexyl‐1‐methylimidazoliumhexafluorophosphate[Hmim][PF6], 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl) imide[Bmpyr][NTf2], and 1-octyl-3-methyl imidazolium tetra fluoroborate[Omim][BF4]. The distribution coefficients for phenol in these ionic liquids were measured at different pH values and found to be much larger than those in conventional solvents. Through the values of the distribution coefficients and the experiments that were conducted on bulk liquid membrane applying various types of prepared ionic liquids, 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide was selected as the best ionic liquid which gave the highest extraction and stripping efficiencies. The effect of several parameters, namely, feed phase pH(2-12), feed concentration(100-1000 ppm), NaOH concentration(0-0.5M), temperature (20-50oC), feed to membrane volume ratio (200-400ml/80ml ionic liquid) and stirring speeds(75-125 rpm) on the performance of the choosen ionic liquid membrane were also studied. The preliminary study showed that high phenol extraction and stripping efficiencies of 97% and 95% respectively were achieved by ionic liquid membrane with a minimum membrane loss which offers a better choice to organic membrane solvents.


Article
Investigation of the New Room Temperature Ionic Liquid of Al(NO3)3.9H2O with Urea CO(NH2)2
تشخيص السائل الايوني الجديد المتكون بدرجة حرارة الغرفة من نترات الالمنيوم المائية مع اليوريا

Authors: Nidhal M. Hasan نضال محمد حسن --- Hadi M.A.Abood هادي محمد علي عبود --- Mahasin F. Alias محاسن فيصل الياس
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2016 Volume: 13 Issue: 3 Pages: 489-497
Publisher: Baghdad University جامعة بغداد

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Abstract

Mixing aluminum nitrate nonahydrate with urea produced room temperatures clear colorless ionic liquid with lowest freezing temperature at (1: 1.2) mole ratio respectively. Freezing point phase diagram was determined and density, viscosity and conductivity were measured at room temperature. It showed physical properties similar to other ionic liquids. FT-IR,UV-Vis, 1H NMR and 13C NMR were used to study the interaction between its species where - CO ـــ Al- bond was suggested and basic ion [Al(NO3)4]ˉ and acidic ions [Al(NO3)2. xU]+ were proposed. Water molecule believed to interact with both ions. Redox potential was determined to be about 2 Volt from – 0.6 to + 1.4 Volt with thermal stability up to 326 ℃.

حضر سائل ايوني جديد عديم اللون وبدرجة حرارة الغرفة من مزج نترات الالمنيوم المائية مع اليوريا بنسبة مولية هي 1.2:1 على التوالي وبأدنى درجة انجماد تم التوصل اليها من دراسة مخطط الطور, ودراسة بعض الخواص مثل الكثافة و اللزوجة والتوصيلية الكهربائية عند درجة حرارة الغرفة فوجد ان السائل الايوني المحضر له خصائص فيزيائية مماثلة لسوائل ايونية اخرى. ولدراسة التداخل بين مكونات هذا السائل الايوني استخدمت التقنيات فيزيائية- طيفية طيف الاشعة تحت الحمراء و الاشعة فوق البنفسجية- المرئية و طيف الرنين النووي المغناطيسي حيث افترض تكون اصرة بين اوكسجين مجموعة الكاربونيل واللالمنيوم (-CO-Al-) مع اقتراح الايون السالب (القاعدي)هو [Al(NO3)4]ˉ والايون الموجب (الحامضي) [Al(NO3)2.XU]+ مع الافتراض حدوث تفاعل لجزيئات الماء مع كلا الايونيين. تم تحديد النافذة الكهربائية لهذا السائل الايوني وكانت حوالي 2V من V -0.6 الى + 1.4 V من معرفة جهد تأكسد- اختزال ويمتاز باستقرارية حرارية اعلى من 326 درجة مئوية.

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