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Your search keyword '"Gerd Maurer"' showing total 27 results
Start Over Author "Gerd Maurer" Publication Type Academic Journals
27 results on '"Gerd Maurer"'

3. Solubility of Hydrogen Sulfide in Aqueous Solutions of Piperazine in the Low Gas-Loading Region.

Author

Dirk Speyer and Gerd Maurer

Subjects
*HYDROGEN sulfide, *SOLUBILITY, *SOLUTION (Chemistry), *PIPERAZINE, *GAS chromatography, *THERMODYNAMICS, *VAPOR-liquid equilibrium, *GIBBS' free energy
Abstract

The solubility of hydrogen sulfide in 2 m(about 0.146 mass fraction) aqueous solutions of 1,4-diazacyclohexane (piperazine, PIPH2) was measured at low gas loadings (at stochiometric molar ratios of hydrogen sulfide to PIPH2between about 0.14 and 1.04) and low partial pressures of hydrogen sulfide (from about (1.3 to 98.7) kPa) at (313.5 and 392.2) K by headspace gas chromatography. The new experimental results are a supplement to previously published data in the high gas-loading region. The new experimental data are compared to prediction results from a thermodynamic model that was based only on gas solubility data in the high gas-loading area. That thermodynamic model for describing the vapor−liquid equilibrium uses Pitzer’s molality-based equation for the excess Gibbs energy of the aqueous solution. The average relative deviation between the new experimental results and the predictions for the partial pressure of hydrogen sulfide amounts to 10 %. [ABSTRACT FROM AUTHOR]

Published
2011
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12. Molecular simulation of the salting out effect in the system H2S–H2O–NaCl.

Author

Johannes VorholzPresent address: Evonik Industries, Performance Polymers, Kirschenallee, Darmstadt, Germany, and Gerd Maurer

Abstract

The reduction of the solubility of a gas due to the presence of ionic species in a solvent is called “salting-out”. The “salting-out” of hydrogen sulfide by sodium chloride in water was predicted by Gibbs ensemble Monte Carlo simulation at temperatures between 373 and 423 K and at salt molalities up to 10 mol kg−1.The intermolecular interactions were modeled by combining Lennard-Jones potentials with Coulomb interactions. Several force fields were examined. The interactions between unlike species were estimated using two common combining rules without any adjustable parameters for the dispersion interaction. The simulations predict the “salting-out” of hydrogen sulfide by sodium chloride in aqueous solutions in an at least qualitative, partly in a quantitative manner. [ABSTRACT FROM AUTHOR]

Published
2008
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