Absorption by Prof. Dr.-Ing. Kurt Thormann (auth.) PDF

By Prof. Dr.-Ing. Kurt Thormann (auth.)

ISBN-10: 3540024816

ISBN-13: 9783540024811

ISBN-10: 3642459390

ISBN-13: 9783642459399

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Example text

MAl und A. L. BABBl: 1 257 . 105 Peo , = ' 1 (1 _ 12 Nl,362 I) exp - (2729JT) (34) MAl, K. , u. A. L. BABB: Industr. Engng. Chern. Bd. 47 (1955) 9, S. 1749. ---n reagierenden Mittels steil an. mmHq Wie sich aus dieser Beziehung ergibt, wird der Partialdruck 7001----l---+---ft-----l-I----lH mit ·zunehmender Temperatur groBer. Als Beispiel zeigt Abb. 13 den CO 2 -Partialdruck iiber Natriumkarbonat-Bikarbonatc: Losungen mit der Normalitat 1 u ~ 501----l---+-+--t----+-+-+-~ in Abhangigkeit vom Bikarbonatanteil f nach Angaben von A.

Liegt der Gesamtdruck unter dem Eigendampfdruck, so ist der Aktivitatskoeffizient 8 < 1, so daB die Komponente weniger fliichtig erscheint und im Waschmittel loslicher ist. Da das Waschmittel, verglichen mit den zu absorbierenden Stoffen, den geringsten Dampfdruck hat, wird seine Fliichtigkeit durch hohen Gesamtdruck am meisten erhOht. Die niedrigstsiedenden Stoffe des Gemischs erscheinen durch den EinfluB des hohen Gesamtdrucks weniger fliichtig, so daB ihre Loslichkeit im Waschmittel zunimmt.

E. BAKER u. H. PURCELL: Industr. Engng. Chern. Bd. 1128. 1 Z Absorptionsgleiehgewiehte mit ehemiseher Bindung 39 gegebenen HzS/COz-Verhaltnis in der Gasphase steigt daher das Verhaltnis der vorhandenen Hydrosulfidmenge zur Bikarbonatmenge mit zunehmender Temperatur. Die Gleichgewichtskonstante fur PH 2 S ergibt sich aus dem VerMltnis K z =K3 /K 1 • Fiir die gleichen Zwecke haben sich verschiedene Amine bewahrt, insbesondere Mono-, Di- und Triathanolamine, wobei folgende Reaktion ablauft: Es bildet sich demnach zunachst ein Karbonat, das durch weitere COz-Aufnahme teilweise in ein Bikarbonat umgesetzt wird.

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Absorption by Prof. Dr.-Ing. Kurt Thormann (auth.)


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