Experimentelle Untersuchung und Modellierung der Löslichkeit von Kalkstein und Gips in wässerigen Systemen bei höheren Ionenstärken

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The detailed investigations of solubility of limestone und gypsum are essential for optimization of process conditions and operating material consumption in the flue gas scrubbers. This study compares thermodynamic predictions based on the Pitzer model for electrolyte activities with experimental data obtained from salt (gypsum, limestone, calcium adipat) solubility tests in aqueous model systems at high ionic strengths under different partial pressures of carbon dioxide. The high ionic strengths in these aqueous suspensions were achieved by addition of calcium chloride, calcium formate und calcium acetate. By means of measured data the Pitzer interaction parameters for ionic pairs Ca2+/HCO3-, Ca2+/SO42-, Ca2+/HCOO-, Ca2+/CH3COO- and Ca2+/(CH4)2(COO)22- at ionic strength up to 8 mol∙kg-1 were fitted and verified. The Pitzer parameters for interaction between calcium ions and carboxylic acid ions were published in this work for the first time. Also for the first time, the values of standard free energies of formation of calcium formate, calcium acetate and calcium adipate are published. The new model parameters allow a better calculation of thermodynamic equilibriums at industrial processes of flue gas cleaning.
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Dokumententyp:
Wissenschaftliche Abschlussarbeiten » Dissertation
Fakultät / Institut:
Fakultät für Ingenieurwissenschaften » Maschinenbau und Verfahrenstechnik
Dewey Dezimal-Klassifikation:
600 Technik, Medizin, angewandte Wissenschaften » 620 Ingenieurwissenschaften
Stichwörter:
solubility, ionic strength, limestone, flue-gas cleaning, gypsum, interaction, Pitzer modell
Beitragende:
Prof. Dr.rer. nat. Herbell, Jan-Dirk [Betreuer(in), Doktorvater]
Prof. Dr. Molt, Karl [Gutachter(in), Rezensent(in)]
Sprache:
Deutsch
Kollektion / Status:
Dissertationen / Dokument veröffentlicht
Datum der Promotion:
28.07.2003
Dokument erstellt am:
28.07.2003
Dateien geändert am:
16.04.2007
Medientyp:
Text