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    Tytuł:
    Efficiency of acetone-butanol-ethanol-water system separation by pervaporation
    Autorzy:
    Marszałek, J.
    Kamiński, W. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/185102.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    perwaporacja
    pervaporation
    biobutanol
    quaternary system
    Opis:
    The article focuses on multicomponent system separation with the use of an innovative membranebased technique i.e. pervaporation. Pervaporation is a membrane technique for separation of liquid mixtures on solid nonporous membranes. Pervaporation is used in this study to separate a quaternary system acetone-butanol-ethanol-water. Such a system may be derived from ABE fermentation process, and the resulting product, biobutanol, is a potential biofuel and may be used in internal combustion engines. Experiments in the study involving concentration of butanol by pervaporation were performed using PERVAP 4060 flat-sheet commercial membrane. To describe the PV process a semi-empirical approach was used. As a result of experiments and calculations permeance coefficients were obtained. Separation and permeance factors were calculated to assess the efficiency of the system separation. Beforehand, activity coefficients were determined for all the components of the mixture with the NRTL equation. Separation coefficients for all the components differed depending on process parameters: concentration, feed flow rate and process temperature. The study confirmed the separation effect of the quaternary system. The most interesting results were obtained for the concentration of butanol. Pervaporation allows to concentrate butanol over 10 times. The permeance coefficient reached for butanol an average value of 7.06 10-3 in comparison with the results for ethanol 3.24 10-2 and acetone 1.83 10-2 [kmol(m2h)-1]. The temperature change from 50 to 70 [degrees]C led to an increased permeance factor and there was no apparent effect on it in the feed flow rate. Due to the hydrophobicity of the membrane water fluxes in the quaternary system were negative.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 1; 131-140
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of genetic algorithms to determine heavy metal ions sorption dynamics on clinoptilolite bed
    Autorzy:
    Tomczak, E. T.
    Kamiński, W. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/185117.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    algorytm genetyczny
    jony metali ciężkich
    klinoptylolit
    heavy metal ions
    clinoptilolite
    sorption dynamics
    genetic algorithm
    Opis:
    In the last decade a growing interest was observed in low-cost adsorbents for heavy metal ions. Clinoptilolite is a mineral sorbent extracted in Poland that is used to remove heavy metal ions from diluted solutions. The experiments in this study were carried out in a laboratory column for multicomponent water solutions of heavy metal ions, i.e. Cu(II), Zn(II) and Ni(II). A mathematical model to calculate the metals' concentration of water solution at the column outlet and the concentration of adsorbed substances in the adsorbent was proposed. It enables determination of breakthrough curves for different process conditions and column dimensions. The model of process dynamics in the column took into account the specificity of sorption described by the Elovich equation (for chemical sorption and ion exchange). Identification of the column dynamics consisted in finding model coefficients [beta], KE and Deff and comparing the calculated values with experimental data. Searching for coefficients which identify the column operation can involve the use of optimisation methods to find the area of feasible solutions in order to obtain a global extremum. For that purpose our own procedure of genetic algorithm is applied in the study.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 1; 103-116
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena przydatności torfu do usuwania chlorofenoli z roztworów wodnych
    Evaluation of the usefulness of peat for removal of chlorophenols from water solutions
    Autorzy:
    Kuśmierek, K.
    Dąbek, L.
    Kamiński, W.
    Świątkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/237432.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
    Tematy:
    water treatment
    chlorophenols
    peat
    adsorption kinetics
    adsorption equilibrium
    oczyszczanie wody
    chlorofenole
    torf
    kinetyka adsorpcji
    równowaga adsorpcyjna
    Opis:
    Three chlorophenols of various number of chlorine atoms in the molecule (4-CP, 2,4-DCP and 2,4,6-TCP) were selected for experiments. Removal of these compounds from aqueous solutions has been studied using commercially available Spill-Sorb peat from Parland County (Alberta, Canada). To describe the kinetic data pseudo-first and pseudo-second order models were used. The results showed that the adsorption of chlorophenols on the peat fitted well the pseudo-second order kinetic model. The values of the rate constants k2 decreased with the increase in the initial concentration of chlorophenol and with the increase in the number of chlorine atoms in the molecule. Adsorption was analysed as a function of solution concentration at equilibrium. The experimental data received were found to be well described by the Freundlich isotherm equation. KF and n values increased in the order 4-CP<2,4-DCP<2,4,6-TCP. This suggests that the adsorption efficacy increases with increasing number of chlorine atoms in the chlorophenol molecule.
    Do badań wybrano trzy chlorofenole o różnej liczbie atomów chloru w cząsteczce (4-CP, 2,4-DCP i 2,4,6-TCP). Usuwanie tych związków z roztworów wodnych badano używając komercyjnie dostępny torf Spill-Sorb z torfowiska Parland County, Alberta, Kanada. Do opisu danych kinetycznych zastosowano modele pseudo-pierwszego i pseudo-drugiego rzędu. Wyniki pokazały, że adsorpcja chlorofenoli na torfie przebiegała zgodnie z kinetycznym modelem pseudo-drugiego rzędu. Wartości stałych szybkości k2 zmniejszały się wraz ze wzrostem stężenia początkowego chlorofenolu oraz wraz ze wzrostem liczby atomów chloru w cząsteczce. Analizując adsorpcję w funkcji równowagowego stężenia roztworu stwierdzono, że uzyskane dane eksperymentalne dobrze opisywało równanie izotermy Freundlicha. Wartości parametrów KF i n wzrastały w kolejności 4-CP<2,4-DCP<2,4,6-TCP, co sugeruje, że skuteczność adsorpcji wzrastała wraz ze wzrostem liczby atomów chloru w cząsteczce chlorofenolu.
    Źródło:
    Ochrona Środowiska; 2013, 35, 2; 51-55
    1230-6169
    Pojawia się w:
    Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of satellite observations for the evaluation of the land surface temperature from GEM model forecast
    Autorzy:
    Gawuc, L.
    Struzewska, J.
    Kaminski, J. W.
    Durka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/115542.pdf
    Data publikacji:
    2014
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    MODIS
    surface temperature
    model evaluation
    temperatura powierzchni
    ocena modelu
    Opis:
    Application of satellite observations for the evaluation of the land surface temperature from GEM model forecastAbstract: The Global Environmental Multiscale model (GEM) was evaluated against satellite observations and measurements from synoptic stations. The computational grid was set up in the global variable mode with the resolution of ~25 km over Central Europe. Model evaluation was performed over Central Europe within a window of 43-56°N latitude and 10-25°E longitude. Surface temperature forecasts were compared with the Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperature product. Air temperature measured at the height of 2 metres was obtained from about 480 synoptic stations from 13 Central Europe countries. Air temperature measurements collected at 9 UTC and 12 UTC during five days (31 January, 2 February, 3 March, 27 April and 18 June 2012) was compared with the GEM model results. Evaluation showed good agreement between modelled and observed data. In case of air temperature, the averaged value of the Mean Bias Error (MBE) was -0.42, the averaged Root Mean Square Error (RMSE) and the Mean Absolute Gross Errors (MAGE) were 3.21 and 2.32, respectively. Land surface temperature comparisons gave results of -2.01; 3.91 and 3.24 of the (MBE), (RMSE), and (MAGE), respectively. Also, correlation of derived modelling errors between surface temperature and air temperature are discussed. In each case the correlation coefficient was positive. The highest value (0.70) was obtained for periods when surface – atmosphere radiative exchange processes were dominant.
    Źródło:
    Challenges of Modern Technology; 2014, 5, 2; 25-32
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New insight into organic anion transporters from the perspective of potentially important interactions and drugs toxicity
    Autorzy:
    Mor, A.L.
    Kaminski, T.W.
    Karbowska, M.
    Pawlak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/70038.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    organic anion transporter
    transmembrane transporter
    drug-drug interaction
    central nervous system
    glycosylation
    herbal preparation
    dietary supplement
    pharmacokinetic interaction
    Źródło:
    Journal of Physiology and Pharmacology; 2018, 69, 3
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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