2001, ISBN: 9783832463090

Inhaltsangabe:Abstract:The separation of complex nonideal mixtures is a common problem in the process industries. The solvent recovery is an important task for chemical engineers to minim… Mehr…

Inhaltsangabe:Abstract:The separation of complex nonideal mixtures is a common problem in the process industries. The solvent recovery is an important task for chemical engineers to minimize burden upon the environment due to exhaustive use of solvents. The recovery of the individual components is complicated by the highly nonideal features of these mixtures. The separation of such highly nonideal mixtures can be limited by the presence of azeotropes, which can create distillation boundaries. These distillation boundaries are forming distillation regions which are difficult to overcome with the standard rectification. Distillation systems for these highly nonideal azeotropic mixtures are particularly difficult to design and to operate in an efficient way. In printing companies often four component mixtures of ethanol, ethyl acetate, isopropyl acetate, and water arise as waste. A separation scheme of multicomponent azeotropic distillation is developed and successfully used for a highly nonideal quaternary mixture. The composition of the mixture in mass percent is ethanol 30%, water 20%, ethyl acetate 25% and isopropyl acetate with 20%. The rest of the mixture (5%) consists of n-propane, isopropane, cyclohexane, and etoxypropane. For the further investigation just the quaternary mixture is examined. Generally, every component should be recovered as pure as possible from the mixture.In the mixture namely five binary and two ternary azeotropes are formed by the components. Based on the synthesis procedure proposed by Rev et al. and Mizsey et al. a new separation technology is developed followed up the vapor-liquid-liquid equilibrium behavior of the mixture. They have recommended a general framework for designing feasible schemes of multicomponent azeotropic distillation. This procedure recommends to study in detail the vapor-liquid-liquid equilibrium data to explore immiscibility regions, azeotropic points, and separatrices for ternary and quaternary regions. On the behalf of the VLLE data the set of feasible separation structures is explored. This procedure is followed and a new separation structure is developed and tested experimentally.First, the quaternary mixture is separated into two ternary mixtures by distillation. The two ternary mixtures containing ethyl acetate, ethanol, water and isopropyl acetate, ethanol, water, respectively. Due to the analogous behavior of the two ternary mixtures similar separation cycles can be designed. The two ternary mixtures are separated by extraction followed by azeotropic distillations. Finally, the components are recovered with a purity of higher then 95%. The key point of the separation technology is the first column, in which the split of the quaternary mixture into two ternary mixtures takes place. This unit operation is tested in a laboratory size column containing structured packing. Steady-state continuous distillation is carried out for 5 hours controlling the column according to the typical top temperature. The distillate and bottom products are analyzed and compared with the simulation data. The comparison of the simulated and experimental data shows a good agreement which proves the accuracy of the VLLE method and the simulated results.The good agreement of the simulated and measured results assures the successful applicability of the new solvent recovery technology. It can be concluded that the new separation sequence for this highly nonideal mixture can be used for this purpose.Zusammenfassung:Die Trennung nicht idealer Gemische ist ein allgemeines Problem in der Chemischen Industrie. Besonders die Aufarbeitung von Lösungsmittelabfällen spielt eine bedeutende Rolle um den Schutz der Umwelt zu gewährleisten. Ein Lösungsmittelrecycling wird erschwert durch die Komponentenvielfalt sowie den damit verbundenen Azeotropen in diesen Gemischen und schränkt die Rektifikation als mögliche Trennvariante ein. Das Gleichgewichtsverhalten von ternären Gemischen lässt sich durch den Verlauf von Destillationslinien beschreiben. Die Existenz von Azeotropen führt zur Ausbildung von Senken und Bergen in der Siedetemperaturfläche der Gemische, wobei Destillationsgrenzen entstehen, welche das Gemisch in Destillationsgebiete unterteilen. Je nach Anzahl und Charakter der Azeotrope kann ein Gemisch mehrere Destillationsgrenzen ausbilden welche durch Rektifikation nicht oder nur durch geeignete Massnahmen zu überwinden sind.Ziel der Arbeit war die Untersuchungen eines nicht ideale Diplomarbeit aus dem Jahr 2001 im Fachbereich Chemie - Allgemeines, Note: 1,0, Technische Universität Graz (unbekannt), Sprache: Englisch eBook eBooks>Fremdsprachige eBooks>Englische eBooks>Sach- & Fachthemen>Chemie, Diplom.de<

ISBN: 3832463097

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Pappbilderbuch, [EAN: 9783832463090], Diplomica, Diplomica, Book, [PU: Diplomica], Diplomica, 54071011, Genres, 60447011, Architektur, Technik & Ingenieurswesen, 66034011, Belletristik, 56797011, Biografien & Erinnerungen, 58173011, Business, Karriere & Geld, 65981011, Comics, Mangas & Graphic Novels, 62991011, Computer & Internet, 54072011, Eltern & Familie, 57127011, Fantasy & Science Fiction, 65677011, Freizeit, Haus & Garten, 65140011, Geschichte, 64617011, Gesundheit, Geist & Körper, 59283011, Jugendbücher, 53817011, Kalender, 61180011, Kinderbücher, 64085011, Kochen & Genießen, 68333011, Krimis & Thriller, 59670011, Kunst & Fotografie, 54127011, Lernen & Nachschlagen, 55555011, Liebesromane & -erzählungen, 56535011, Medizin, 53965011, Musiknoten, 65108011, Outdoor, Umwelt & Natur, 63925011, Recht, 58645011, Reise & Abenteuer, 54682011, Religion & Esoterik, 69028011, Sachbücher, 65636011, Schwul & Lesbisch, 58390011, Sport & Fitness, 64226011, Unterhaltung & Kultur, 56047011, Wissenschaft, 52044011, Fremdsprachige Bücher<

ISBN: 9783832463090

Separation of a highly nonideal mixture for solvent recovery: Andreas Raab Separation of a highly nonideal mixture for solvent recovery: Andreas Raab eBooks > Fachthemen & Wissenschaft … Mehr…

Separation of a highly nonideal mixture for solvent recovery: Andreas Raab Separation of a highly nonideal mixture for solvent recovery: Andreas Raab eBooks > Fachthemen & Wissenschaft > Wissenschaften allgemein, Diplom.de<

ISBN: 9783832463090

eBooks > Fachthemen Wissenschaft > Wissenschaften allgemein

2003, ISBN: 9783832463090

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