Zum Einfluß des Diarsenit‐Ions bei der Arsenition‐katalysierten CO<sub>2</sub>‐Hydratation

Piechura, Hans; Bub, G.

doi:10.1002/cite.330521025

Chemie Ingenieur Technik

1980

DOI: 10.1002/cite.330521025

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Zum Einfluß des Diarsenit‐Ions bei der Arsenition‐katalysierten CO₂‐Hydratation

Hans Piechura¹,

G. Bub²

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Gas absorption rates in a stirred cell with plane interface in the presence of fine particles

1989

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The rates of absorption of carbon dioxide into water and into 0.5 mol/L equimolar carbonate buffer solutions (containing varying amounts of arsenite) were measured in a stirred cell with plane interface in the presence of fine solids (activated carbon, kieselguhr and alumina). Experiments show that the absorption rate increases significantly when the activated carbon loading increases up to about 0.2 g/L and thereafter remains constant. No significant effects were observed for other solids. The results could be explained in terms of a "shuttle" mechanism where particles adsorb gas near the interface which is then followed by desorption (or reactions) in the bulk. At very high loadings (above 10 vol. %), the absorption rate decreased for all particles and this could be explained by the blockage of the interface and/or by the sharp increase in the suspension viscosity. ~~Les vitesses d'absorption du bioxyde de carbone dans I'eau et dans des solutions tampon de carbonate Cquimolaires de 0,5 mol/L (contenant difftrentes quantitts d'arsenite) ont CtC mesurtes dans une cellule agitCe avec une interface plane en prCsence de particules solides fines (carbone activC, kieselguhr et alumine). Les exptriences montrent que la vitesse d'absorption augmente de maniere significative lorsque le chargement en carbone activt augmente jusquh environ 0,2 glL, mais reste stable par la suite. Aucun effet significatif n'a CtC relevt pour les autres solides. Les resultats peuvent &re expliquts sous I'angle d'un mtcanisme de "navette" par lequel les particules adsorbent le gaz pres de l'i?terface, suivi d'une desorption (ou rkactions) dans le chargement.A des charges tres ClevCes (au-dessus de 10% en volume), la vitesse d'absorption diminue pour toutes les particules, ce qui peut s'expliquer par le blocage de I'interface ou I'augmentation tres nette de la viscosite des suspensions.

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Gas absorption rates in a stirred cell with plane interface in the presence of fine particles

1989

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Enhancement of the Absorption of CO₂ in Alkaline Buffers by Organic Solutes: Relation with Degree of Dissociation and Molecular OH Density

Vázquez

Chenlo

Pereira

1997

Ind. Eng. Chem. Res.

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Absorption of CO2 in a wetted-wall column by 0.5 M Na2CO3/0.5 M NaHCO3 buffer with and without various concentrations of saccharose, fructose, glucose, formaldehyde, glycerin, methanol, or ethanol was measured under conditions in which the reaction of CO2 was of pseudo-first-order. For the purposes of comparison, experiments were also carried out with arsenite in both buffer and pure water. For all of these solutes, the absorption enhancement factor increased with solute concentration. Rate constants k c for the overall reaction were obtained by fitting Danckwerts' expression for absorption to the experimental data, and correlation of k c with solute concentration then afforded rate constants k cat for the catalyzed reactions. For each solute, an empirical correlation was found between the absorption enhancement factor and Hatta numbers calculated from the rate constant for the uncatalyzed reaction and from k = k cat[cat]. The notion that the enhancement of absorption by acid−base reaction is facilitated by dipole−dipole interaction between the solutes and CO2 is supported by an empirical correlation relating k cat to the degree of dissociation of the solute and the density of OH groups in the solute molecule.

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Zum Einfluß des Diarsenit‐Ions bei der Arsenition‐katalysierten CO₂‐Hydratation

Cited by 2 publications

References 1 publication

Gas absorption rates in a stirred cell with plane interface in the presence of fine particles

Gas absorption rates in a stirred cell with plane interface in the presence of fine particles

Enhancement of the Absorption of CO₂ in Alkaline Buffers by Organic Solutes: Relation with Degree of Dissociation and Molecular OH Density

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Zum Einfluß des Diarsenit‐Ions bei der Arsenition‐katalysierten CO2‐Hydratation

Cited by 2 publications

References 1 publication

Gas absorption rates in a stirred cell with plane interface in the presence of fine particles

Gas absorption rates in a stirred cell with plane interface in the presence of fine particles

Enhancement of the Absorption of CO2 in Alkaline Buffers by Organic Solutes: Relation with Degree of Dissociation and Molecular OH Density

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Product

Resources

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Zum Einfluß des Diarsenit‐Ions bei der Arsenition‐katalysierten CO₂‐Hydratation

Enhancement of the Absorption of CO₂ in Alkaline Buffers by Organic Solutes: Relation with Degree of Dissociation and Molecular OH Density