Correlation of Experimental Data and Prediction of Vapour-liquid Equilibria in the Methyl Ethyl Ketone + Polystyrene System
Bogdanić, Grozdana; Pavlíček, Jan; Wichterle, Ivan
2015 - English Keywords: experimental data; vapour-liquid equilibria; systems Available at various institutes of the ASCR Correlation of Experimental Data and Prediction of Vapour-liquid Equilibria in the Methyl Ethyl Ketone + Polystyrene System

Bogdanić, Grozdana; Pavlíček, Jan; Wichterle, Ivan
Ústav chemických procesů, 2015

Physicochemical Characterization of Chiral Ionic Liquids for Their Applications.
Andresová, Adéla; Bendová, Magdalena; Wagner, Zdeněk; Husson, P.; Feder-Kubis, J.; Traïkia, M.
2015 - English In this work, we address a thermodynamic characterization of a homologous series of 1–[(1R, 2S, 5R)-(–)-menthoxymethyl]-3-alkylimidazolium bis{(trifluoromethyl)sulfonyl} imide ionic liquids. The alkyl chain length ranges from methyl to dodecyl. In this study, our attention is focused on the thermodynamic properties of the pure CILs, i.e. on their heat capacities, densities, viscosities, and self-diffusion coefficients of the cations. The second level is to gain a deeper understanding of the structure-property relationships. Data analysis was carried out by means of mathematical gnostics. Keywords: ionic liquids; thermodynamic properties; mathematical gnostics Available at various institutes of the ASCR Physicochemical Characterization of Chiral Ionic Liquids for Their Applications.

In this work, we address a thermodynamic characterization of a homologous series of 1–[(1R, 2S, 5R)-(–)-menthoxymethyl]-3-alkylimidazolium bis{(trifluoromethyl)sulfonyl} imide ionic liquids. The alkyl ...

Andresová, Adéla; Bendová, Magdalena; Wagner, Zdeněk; Husson, P.; Feder-Kubis, J.; Traïkia, M.
Ústav chemických procesů, 2015

Sorption and Diffusion Coefficients of Single Enantiomers in Chiral Membranes
Izák, Pavel; Sysel, P.; Hovorka, Š.; Randová, A.; Vychodilová, Hana; Červenková Šťastná, Lucie; Brožová, Libuše; Žitka, Jan
2015 - English Keywords: polymeric membranes; hyperbranched polyimide membranes; diffusion coefficients Available on request at various institutes of the ASCR Sorption and Diffusion Coefficients of Single Enantiomers in Chiral Membranes

Izák, Pavel; Sysel, P.; Hovorka, Š.; Randová, A.; Vychodilová, Hana; Červenková Šťastná, Lucie; Brožová, Libuše; Žitka, Jan
Ústav chemických procesů, 2015

Hyperbranched Polyimide End-Capped with (+) or (-) – Isopinocampheylamine Used for Racemic Mixture Separation
Sysel, P.; Vychodilová, Hana; Červenková Šťastná, Lucie; Žitka, Jan; Brožová, Libuše; Randová, A.; Hovorka, Š.; Izák, Pavel
2014 - English In this work, the hyperbranched polyimides terminated with (+) or (-) – isopinocampheylamine were prepared and characterized. Their ability to separate of racemic mixtures of α-pinenes was also evaluated. Keywords: racemic mixture; polymeric membranes Available on request at various institutes of the ASCR Hyperbranched Polyimide End-Capped with (+) or (-) – Isopinocampheylamine Used for Racemic Mixture Separation

In this work, the hyperbranched polyimides terminated with (+) or (-) – isopinocampheylamine were prepared and characterized. Their ability to separate of racemic mixtures of α-pinenes was also ...

Sysel, P.; Vychodilová, Hana; Červenková Šťastná, Lucie; Žitka, Jan; Brožová, Libuše; Randová, A.; Hovorka, Š.; Izák, Pavel
Ústav chemických procesů, 2014

Hydrodynamic Study of the Downward Annular Gas-Liquid Flow under the Pilot Plant Operating Conditions 2013-2014.
Stavárek, Petr; Křišťál, Jiří
2014 - English Hydrodynamics of annular liquid flow in a vertical tube with cocurrent gas flow has been studied. Effect of gas - liquid flow rate and liquid viscosity on two-phase flow hydrodynamics was investigated for glycerol – air system. The evaluated parameters were pressure drop and hydrodynamic regime at different gas/liquid ratios. Keywords: annular gas-liquid flow; pressure drop; hydrodynamics Available at various institutes of the ASCR Hydrodynamic Study of the Downward Annular Gas-Liquid Flow under the Pilot Plant Operating Conditions 2013-2014.

Hydrodynamics of annular liquid flow in a vertical tube with cocurrent gas flow has been studied. Effect of gas - liquid flow rate and liquid viscosity on two-phase flow hydrodynamics was investigated ...

Stavárek, Petr; Křišťál, Jiří
Ústav chemických procesů, 2014

18M-IMMEDIATE Research Report: Prototype of Catalyst Powder Sufficient for Testing in MEAs Fabricated
Kaluža, Luděk; Zdražil, Miroslav; Gulková, Daniela; Koštejn, Martin; Vít, Zdeněk
2014 - English High loadings of platinum (60 wt%) were precipitated (ICPF) or depo-sited (CNRS) onto research grade carbon black supports provided by TC. The supports and the resulting electrocatalysts were thoroughly characterised in order to select the best ones for optimisation and up-scaled manufacturing. For the preparation and characterisation vari-ous methodologies have been developed. Batches of the gram size were prepared of a handful of the most promising catalysts. This is sufficient for the preparation of test MEAs. Keywords: Pt catalysts; stress tests; nitrogen physisorption Available at various institutes of the ASCR 18M-IMMEDIATE Research Report: Prototype of Catalyst Powder Sufficient for Testing in MEAs Fabricated

High loadings of platinum (60 wt%) were precipitated (ICPF) or depo-sited (CNRS) onto research grade carbon black supports provided by TC. The supports and the resulting electrocatalysts were ...

Kaluža, Luděk; Zdražil, Miroslav; Gulková, Daniela; Koštejn, Martin; Vít, Zdeněk
Ústav chemických procesů, 2014

Models of AWS Material Functions
Wein, Ondřej; Pěnkavová, Věra
2014 - English New classes of 4-parameter models of fluidity for the shear-thinning non-Newtonian liquids are introduced, including their local pseudosimilarity representation. The models cover both purely-viscous (PV) and visco-plastic (VP) flow behavior. New 4-parameter model of slipidity (Navier slip coefficient) is introduced, as well as its modification for retarded AWS (slipidity decreasing with rising shear stress) and wall dilatancy (negative slipidity). Their asymptotic behavior, as well as their asymptotic sub-models are identified and prepared for implementation in the software AWSWork. Keywords: visco-plastic materials; purely viscous liquids; pseudosimilarity; material functions Available on request at various institutes of the ASCR Models of AWS Material Functions

New classes of 4-parameter models of fluidity for the shear-thinning non-Newtonian liquids are introduced, including their local pseudosimilarity representation. The models cover both purely-viscous ...

Wein, Ondřej; Pěnkavová, Věra
Ústav chemických procesů, 2014

Selective Enantiomer Separation by Pertraction
Izák, Pavel; Kačírková, Marie; Vychodilová, Hana; Červenková Šťastná, Lucie; Žitka, Jan; Brožová, Libuše; Storch, Jan; Randová, A.; Hovorka, Š.
2014 - English Membrane processes are not commonly used in enantiomer separation due to insufficiency explication of separation mechanisms and because the results of chiral membrane separation are not quite satisfying, especially in comparison with other separation technics, namely HPLC. A new method for selective separation of enantiomers by membrane processes taking advantage of ionic liquids is present. The supported chiral room temperature ionic liquid membrane is used for separation of enantiomers. Volatile enantiomers are separated by pervaporation and non-volatile enantiomers by pertraction. Keywords: enantiomer mixture; chiral room temperature ionic liquids; pertraction Available on request at various institutes of the ASCR Selective Enantiomer Separation by Pertraction

Membrane processes are not commonly used in enantiomer separation due to insufficiency explication of separation mechanisms and because the results of chiral membrane separation are not quite ...

Izák, Pavel; Kačírková, Marie; Vychodilová, Hana; Červenková Šťastná, Lucie; Žitka, Jan; Brožová, Libuše; Storch, Jan; Randová, A.; Hovorka, Š.
Ústav chemických procesů, 2014

12M-IMMEDIATE Research Report: Preparation of Pt on Carbon Black Supported Catalysts
Kaluža, Luděk; Zdražil, Miroslav; Gulková, Daniela; Vít, Zdeněk; Šolcová, Olga; Soukup, Karel; Maixnerová, Lucie
2014 - English The aim of this work was to elucidate on advanced preparation of Pt/C catalysts from TimCal carbon black and H2PtCl6. The attention was directed to residual content of chloride in the prepared catalysts and scale-up to the amount about 1 gram of final product. The textrual properties of the supports and selected catalyst were studied by nitrogen physisorption. The analytical methods such as instrumental neutron activation analysis (INAA), liquid ion chromatography (LC), and titration with silver nitrates were applied for Cl analysis. Electron probe micro analysis (SEM-EDX), hydrogen chemisorption, temperature programed desorption of hydrogen (TPD) and a simplified determination of ignition temperature in air flow were used for Pt/C catalysts characterization. Keywords: Pt/C catalysts; carbon black; analytical methods Available at various institutes of the ASCR 12M-IMMEDIATE Research Report: Preparation of Pt on Carbon Black Supported Catalysts

The aim of this work was to elucidate on advanced preparation of Pt/C catalysts from TimCal carbon black and H2PtCl6. The attention was directed to residual content of chloride in the prepared ...

Kaluža, Luděk; Zdražil, Miroslav; Gulková, Daniela; Vít, Zdeněk; Šolcová, Olga; Soukup, Karel; Maixnerová, Lucie
Ústav chemických procesů, 2014

Rheology of Colloidal Dispersions: Deflocculation of Kaolin Dispersions
Guerreiro, M.I.A.; Růžička, Marek; Pěnkavová, Věra
2013 - English All inorganic additives in their optimal concentrations proved to be effective at reducing the initial viscosity to 1%. In the case of NaOH two different trends were observed: firstly this additive behaved as a deflocculant agent where, at its optimal range of concentrations, the viscosity of kaolin dispersion reduced to its minimal value, secondly when used at concentrations above its optimal range, sodium hydroxide behaved like a flocculant agent increasing strongly the viscosity of kaolin dispersions. The possible cause was attributed to an excess of Na+ and OH- species in bulk media that promoted the reversible effect. Similar effect was also reported for NaCMC at high and medium molar weight, were the viscosity firstly decreased to a certain concentration of additive and then above that concentration started to increase. Thus low molar weight NaCMC was the most effective among the organic additives since it decreased the viscosity to 10% of initial viscosity. Qualitative evaluation showed that organic additives promoted more stable dispersions, in contrast to poor stability offered by the inorganic additives, with exception of NaOH that provided dispersions with good stability inside of its optimal range. Keywords: kaolin dispersions; yield strss; viscoplastic fluids Available at various institutes of the ASCR Rheology of Colloidal Dispersions: Deflocculation of Kaolin Dispersions

All inorganic additives in their optimal concentrations proved to be effective at reducing the initial viscosity to 1%. In the case of NaOH two different trends were observed: firstly this additive ...

Guerreiro, M.I.A.; Růžička, Marek; Pěnkavová, Věra
Ústav chemických procesů, 2013