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Autor*in

  • Tuma, Dirk (53)
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High-pressure phase behavior of ternary systems (carbon dioxide + alkanol + hydrophobic ionic liquid) (2010)
Chobanov, K. ; Tuma, Dirk ; Maurer, G.
Some homogeneous liquid mixtures of an ionic liquid and a lower alkanol (e.g., methanol) can be forced to undergo a liquid–liquid phase split (resulting in a three-phase liquid–liquid–vapor (L1L2V) equilibrium) by pressurization with a gas. Such systems exhibit the phenomenon of "salting out by a nearcritical gas". That phenomenon is often observed at temperatures around the critical temperature of the gas in liquid mixtures where at least one of the liquid components is a good solvent for that gas. New experimental results for both the L1L2V equilibrium and the corresponding critical endpoint lines of the two ternary systems (carbon dioxide + methanol + 1-n-butyl-3-methylimidazolium hexafluorophosphate [bmim][PF6]) and (carbon dioxide + 1-butanol + 1-n-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide [hmim][Tf2N]) at temperatures between 293 and 333 K are reported. The experiments were performed with an "analytical method". The liquid–liquid phase split exists only at pressures between a lower critical endpoint line (where both liquid phases become critical and coexist with a vapor phase) and an upper critical endpoint line (where one of the phases becomes critical with the vapor phase while the critical phases coexist with another liquid phase). The compositions of the coexisting three phases L1, L2, and V differ considerably; a high-density, ionic liquid-rich liquid phase (L1) coexists with an alkanol-rich liquid phase (L2) of lower density and a vapor phase (V) that is virtually ionic liquid-free. For both systems, it was observed that, at constant temperature, increasing pressure shifts the L1 phase towards higher contents of ionic liquid and gas and less alkanol, whereas in the L2 phase the mole fractions of ionic liquid and alkanol decrease. Higher temperatures result in a smaller difference between the pressures of both critical endpoint lines. Experimental results for both critical endpoint lines and for the compositions of the coexisting liquid phases are reported.
Ordered mesoporous solids as model substances for liquid adsorption (2010)
Kalies, G. ; Rockmann, R. ; Tuma, Dirk ; Gapke, J.
Two different ordered mesoporous solids, a hexagonal SBA-15 silica sample and its inverse CMK-3 carbon structure were applied in liquid-phase adsorption. By means of the analysis of experimental data of a binary liquid model mixture with one polar and one non-polar component, the general way is outlined how to obtain essential and trustworthy solid information from liquid-phase adsorption.
High-pressure multiphase behavior of the ternary systems (ethene + water + acetone) and (ethane + water + acetone) (2010)
Ulanova, T. ; Tuma, Dirk ; Maurer, G.
Measurement protocols for general applications in gas analysis (2011)
Tuma, Dirk
Hochdruck-Mehrphasengleichgewichte in Systemen mit einem nahekritischen Gas und einer ionischen Flüssigkeit bzw. einem Alkylencarbonat (2009)
Tuma, Dirk
High-pressure solubility of carbon dioxide in imidazolium-based ionic liquids with anions [PF6] and [BF4] (2009)
Lim, B.-H. ; Choe, W.-H. ; Shim, J.-J. ; Ra, C. S. ; Tuma, Dirk ; Lee, H. ; Lee, C. S.
The solubility of carbon dioxide in three ionic liquids (ILs) under supercritical fluid condition was measured at pressures up to 32 MPa and at temperatures of 313.15, 323.15, and 333.15 K in a high-pressure view cell. The imidazolium-derivative ionic liquids 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]), and 1-octyl-3-methylimidazolium tetrafluoroborate ([omim][BF4]) were employed in this research. The effects of pressure, temperature, nature of anion and cation as well as the water content on the solubility of CO2 in the ILs were investigated experimentally. The solubility of CO2 in the IL was higher for the ILs with longer cationic alkyl group and for the ILs with lower anion polarity. The lower the water content or the lower the temperature as well as the higher the pressure, the higher was the solubility of CO2.
Sorption of C. I. disperse red 60 in polystyrene and PMMA films and polyester and nylon 6 textiles in the presence of supercritical carbon dioxide (2010)
Park, S.-C. ; Tuma, Dirk ; Kim, S ; Lee, Y.R. ; Shim, J.-J.
High-pressure gas solubility and associated phase equilibria in systems with ionic liquids 14. - 19.03.2010, (2010)
Tuma, Dirk
Experimental determination of (p,rho,T) data for binary mixtures of methane and helium (2016)
Hernández-Gomez, R. ; Tuma, Dirk ; Segovia, J. J. ; Chamorro, C. R.
The basis for the development and evaluation of equations of state for mixtures is experimental data for several thermodynamic properties. The quality and the availability of experimental data limit the achievable accuracy of the equation. Referring to the fundamentals of GERG-2008 wide-range equation of state, no suitable data were available for many mixtures containing secondary natural gas components. This work provides accurate experimental (p,rho,T) data for two binary mixtures of methane with Helium (0.95 (amount-of-substance fraction) CH4 + 0.05 He and 0.90 CH4 + 0.10 He). Density measurements were performed at temperatures between (250 and 400) K and pressures up to 20 MPa by using a single-sinker densimeter with magnetic suspension coupling. Experimental data were compared with the corresponding densities calculated from the GERG-2008 and the AGA8-DC92 equations of state. Deviations from GERG-2008 were found within a 2% band for the (0.95 CH4 + 0.05 He) mixture but exceeded the 3% Limit for the (0.95 CH4 + 0.05 He) mixture. The highest deviations were observed at T = 250 K and pressures between (17 and 19) MPa. Values calculated from AGA8-DC92, however, deviated from the experimental data by only 0.1% at high pressures and exceeded the 0.2% limit only at temperatures of 300 K and above, for the (0.90 CH4 + 0.10 He) mixture.
Towards a European Infrastructure for the Characterisation of Energy Gases (2011)
Tuma, Dirk
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