National Repository of Grey Literature 61 records found  beginprevious52 - 61  jump to record: Search took 0.02 seconds. 
Pervaporation as a Tool for Higher Effectiveness of Reaction Process
Izák, Pavel ; Kohoutová, Marie ; Afonso, C. A. M. ; Crespo, J.G.
This work is focused on the study of a catalyzed esterification reaction, taking place in the ionic liquid ([bmim] [BF4]), while one of the reaction products (water) is removed by pervaporation.
Sorpční a permeační vlastnosti membrány ze silikonu a iontové kapaliny v butanolových párách
Vopička, O. ; Hynek, V. ; Zgažar, M. ; Friess, K. ; Izák, Pavel
This contribution deals with properties of ionic liquid-silicone blends for butanol vapours.
Vliv obsahu iontových kapalin na vlastnosti neporézních polymerních membrán
Kohoutová, Marie ; Sikora, Antonín ; Hovorka, Š. ; Randová, A. ; Schauer, Jan ; Izák, Pavel
The polydimethylsiloxane membranes containing 0, 10, 20 or 30 wt. % of ionic liquid (benzyl-3-butylimidazolium tetrafluoroborate) were used for separation of butan-1-ol from water. Pervaporation selectivity increased and the butan-1-ol flux through the membrane raised with the increased content of [BBIM][BF4] in the PDMS-[BBIM][BF4] membranes. The PDMS-[BBIM][BF4] membrane showed high stability as well as selectivity (the separation factor raised up to 37, if 30 weight % of ionic liquid was accommodated in PDMS) during all experiments.
Botnání Nafionové membrány a její předpověď skupinově-příspěvkovou metodou
Randová, A. ; Bartovská, L. ; Hovorka, Š. ; Izák, Pavel ; Poloncarzová, M. ; Kolská, Z.
The anisotropic swelling of Nafion 112 membrane in pure organic liquids was monitored by an optical method. The results were used as the input for application of the group contribution method to the relative expansion in equilibrium. Value of plus minus 1.5 % in relative expansions was determined to be the experimental error. Maximum differences between the experimental and calculated relative expansions did not exceed the value of plus minus 3 %.
Sorpce kapalné směsi metanol-benzen v polymerních membránách
Randová, A. ; Bartovská, L. ; Izák, Pavel ; Hovorka, Š. ; Friess, K.
The solubility of single mixture components in the membrane is important for the effectivity of membrane separation processes. This information is accessible from the experimental data on the preferential sorption in combination with the experimental data on the total amount of the sorbed liquid. The sorption from binary liquid solutions methanol-benzene in Nafion and low density polyethylene membranes has been studied in the whole concentration range at constant temperature of 25°C.
Influence of Organic Electrolytes Presence on Swelling of Nafion Membrane in Methanol-Water Mixtures
Randová, A. ; Hovorka, Š. ; Izák, Pavel ; Bartovská, L.
The anisotropic swelling of Nafion 112 foil in methanol - water - inorganic salt was examined. Our results show that even small addition of inorganic salt into methanol - water mixture affects kinetics as well as the swelling equilibrium. The effect of inorganic salts LiCl, NaCl, KCl, CsCl, CaCl2, CdCl2, K2CO3, KNO3, NH4Cl, and AgNO3 was studied. Swelling kinetics of Nafion in ternary mixtures including salt show maximum suggesting that effect of methanol-water is faster but effect of inorganic salt is stronger. Theexperimental data, presented in this work allow us to assume that swelling of Nafion decreases with increasing ionic radius of cation.
Sorption of Organic Compounds in Polymers
Machková, J. ; Šípek, K. ; Izák, Pavel ; Friess, K.
In this article is described process of sorption of organic compounds in polymers.
Permeability of Polymer Membranes for Organic Vapors
Friess, K. ; Šípek, M. ; Hynek, V. ; Bohatá, K. ; Izák, Pavel ; Sysel, P.
In this work the permeability coefficients of saturated and non-saturated vapors through polymer flat membranes were determined. The diferential flow permeameter with thermal conductivity detection of vapor mixtures composition at 25 °C and atmospheric pressure has been used.
Sorpce organických látek v nízkohustotní polyethylenové membráně
Friess, K. ; Machková, J. ; Šípek, M. ; Bartovská, P. ; Sysel, P. ; Izák, Pavel
This paper deals with the sorption of organic vapors (benzene, toluene, cyclohexane, hexane, heptane, acetone, methanol and chloroform) in low density polyethylene membrane BRALEN FB2-30 at 298 K. The sorption of all matters from liquid phase at the same temperature is also under study. The sorption apparatus with Mc Bain spiral quartz balance enabled to follow the sorption kinetics and from experimental data the polymer-solvent interaction parameters  were calculated on the bases by Flory-Huggins theory.

National Repository of Grey Literature : 61 records found   beginprevious52 - 61  jump to record:
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