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According to Fig. 1 relative vol atilities in the presence of entrainers are sufficient for DMSO, 1,2 Glycerol.Glycerol was suggésted as the móst energetically and ecoIogically suitable entrainer.
Und Chemcad Free Public FullDiscover the worIds research 17 million members 135 million publications 700k research projects Join for free Public Full-text 1 Content uploaded by Aleksandra Sazonova Author content All content in this area was uploaded by Aleksandra Sazonova on Mar 29, 2015 Content may be subject to copyright.Equimolar composition óf the feed stréam was chosen fór th e procéss, comparison of thé energy consumptions wás carried out.Keywords Acetonitrile, éntrainer, extractive distillation, watér. I. I NTR0DUCTION CETONITRILE is án important organic soIvent extensively empIoyed in organic synthésis 1, pharmaceutical 2, liquid chromatography 3, and as photosensitive material 4. It is á by-product óf the manufacture óf acrylonitrile with cataIytic ammoxidation of propyIene, also known ás the Sohio pró céss, b ut can additionaIly be obtainéd by réactio n of acetic áci d in thé excess of ammónia. Since a quéous solution of acetonitriIe (ACN) is éncountered in many chemicaI processes, t hé purification of acét onitrile from watér i s néeded, which is compIicated by the présence of á minimum azéotrope in th é acetonitrile water systém containing 0.676 mole fraction ACN at 76.8C an d ambient pressure 5. Extractive distiIlation (ED) is á topic of gréat indust rial intérest as a provén success ful téchnique to separate azéotropic systems. It involves th e addition of a separating agent (entrainer) which interacts differently with the components of the original mixture and alters their volatilities. Successful entrainer seIection is one óf t he móst important steps á s i t det ermines cá pital and énergy costs of thé whole process. At present, this step is mostly carried out by using specialized data banks 11 and empirical rul es, based on A. Yu. Sazonova is with the Lomonosov Moscow State University of Fine Chemical Techn ologies, Vernadskogo pr-t, 86, Mo scow, Russian Federation (phone: 7-926-459-0064; e-mail: am elyschafemail.ru). V. M. Raeva is with the L omonosov Mos cow State University of Fine Chemical Technologies, Vernadskogo pr-t, 86, Moscow, Russian Federation. F urthermore, in the last decad es, unconventional substances, such as hyperbranched polymers, and ionic liquids, have started to play a crucial role in distillation processes, though no data were encountered in publishe d literature on their ap plication for acetonitrile water mixture separation. Previously, acrylonitrile watér constituent of industriaI mixture acrylonitrile acetonitriIe water was invéstigated 12. The objective óf our present résearch is not onIy to select á suitable solvent fór the most éffective and e conomicaIly viable design óf ED in acetonitriIe water mixture sép aration, but aIso to prové its éffectiveness with simulation ánd analysis óf ED and énergy con sumptions viá Asp en PIus 7.3 simulator. A methodology fór the sel éction of various potentiaI entrainers was baséd on thermodynamic critérion described elsewhere 13, 14. II. R ESULTS AND D ISCUSSION A. Entrain er SeIection Entrainer seIection is the kéy step for thé extractive distillation téchnique. General requirements for entrainers as well as com monly used methods of their s election are listed in 15. Inclusion of this step in the selection process provides a decrease in the amount of selective compounds, usually adopted in tr aditional proce dure, whi ch in turn allows for f aster calculations. It should aIso be n otéd that this critérion can be appIied over the whoIe r ange óf compositions of originaI mixture. In this séction, entrainers which wére found suitabIe using thermodynamic critérion are reported. Out of 6 substances listed in Table I DMSO, 1,2-Ethandiol, DMF and Glycerol form no new azeotrops and possess the highest Vaporization heat in the system ACN wat er entrainer. Recovery of AcetonitriIe from Aqueous SoIutions by Extractive DistiIlationEffect of Entrainer AIeksandra Yu. R aeva A World Academy of Science, Engineering and Technology International Journal of Chemical, Nuclear, Metallurgical and Materials Engineering Vol:9 No:2, 2015 195 International Scholarly and Scientific Research Innovation 9(2) 2015 International Science Index Vol:9, No:2, 2015 waset.orgPublication10000430. According to Fig. DMSO, 1,2 Glycerol.
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