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    Wyświetlanie 1-4 z 4
    Tytuł:
    Computational analysis of displacement of particles with given size on the nonstationary bulging membrane as a theoretical model of membrane fouling
    Autorzy:
    Gac, J.M.
    Gradoń, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/185471.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    membrane
    fouling
    membrane cleaning
    numerical modeling
    membrana
    zanieczyszczenia
    czyszczenie membrany
    modelowanie numeryczne
    Opis:
    A simple model of behaviour of a single particle on the bulging membrane was presented. As a result of numerical solution of a motion equation the influence of the amplitude and frequency of bulging as well as the particle size on particle behaviour, especially its downstream velocity was investigated. It was found that the bulging of a membrane may increase the mean velocity of a particle or reinforce its diffusive behaviour, dependeing on the permeation velocity. The obtained results may help to design new production methods of highly fouling-resistant membranes.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 109-119
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of polypropylene membranes by ion implantation
    Autorzy:
    Kotra-Konicka, K.
    Kalbarczyk, J.
    Gac, J.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185296.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ion implantation
    polymer membranes
    membrane separation
    polymer surface modification
    implantacja jonów
    membrany polimerowe
    separacja membranowa
    polimerowa modyfikacja powierzchni
    Opis:
    The influence of ion implantation on the structure and properties of polymers is a very complex issue. Many physical and chemical processes taking place during ion bombardment must be taken into consideration. The complexity of the process may exert both positive and negative influence on the structure of the material. The goal of this paper is to investigate the influence of H+, He+ and Ar+ ion implantation on the properties of polypropylene membranes used in filtration processes and in consequence on fouling phenomena. It has appeared that the ion bombardment caused the chemical modification of membranes which has led to decrease of hydrophobicity. The increase of protein adsorption on membrane surface has also been observed.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 3; 331-339
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of multiple passes through a dynamic membrane on the properties of w/o emulsions
    Autorzy:
    Frankiewicz, Adrianna
    Różański, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2202887.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DMTS system
    dynamic membrane
    water-in-oil
    premix membrane emulsification
    membrane homogenization
    system DMTS
    membrana dynamiczna
    woda w oleju
    emulgowanie membranowe premiksu
    homogenizacja membrany
    Opis:
    Conventional membranes used in the process of premix membrane emulsification are prone to fouling, especially when biopolymers are employed as surfactants. An alternative to conventional membranes are dynamic membranes consisting of an unconsolidated porous medium. Dynamic membranes have the advantage of enabling easy cleaning of the inside of the pores. Experimental research carried out to date has focused on the application of hydrophilic dynamic membranes composed of glass microbeads for producing o/w emulsions. The aims of this study were to determine the efficiency of droplet size reduction in a w/o emulsion when passed through a dynamic hydrophobic membrane consisting of a bed of irregular polymer particles, and to assess the effect of multiple membrane passes on the properties of the w/o emulsion. The dynamic membranes evaluated in the tests were found to reduce the diameters of premix droplets when an appropriate pressure level was reached. Higher bed porosity was associated with greater fluxes achieved across the packed bed, but the resulting emulsions were less homogeneous. Multiple passes of the emulsion through the dynamic polypropylene membrane led to a further reduction in droplet size, but it was accompanied by a decline in emulsion homogeneity.
    Źródło:
    Chemical and Process Engineering; 2022, 43, 4; 449--459
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Membrane installation for biogas enrichment – Field tests and system simulation
    Autorzy:
    Chmielewski, Abdrzej Grzegorz
    Urbaniak, Agata
    Palige, Jacek
    Roubinek, Otton
    Wawryniuk, Katarzyna
    Dobrowolski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/185469.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polymer membranes
    biogas
    methane concentration upgrading
    trace biogas components
    membrane mobile testing unit
    multistage membrane system simulation
    membrany polimerowe
    biogaz
    podwyższenie stężenia metanu
    śladowe komponenty biogazu
    mobilna jednostka testująca membranę
    wielostopniowa symulacja systemu membranowego
    Opis:
    The paper presents results of the field tests on membrane biogas enrichment performed with the application of mobile membrane installation (MMI) with the feed stream up to 10 Nm3/h. The mobile installation equipped with four hollow fibre modules with polyimide type membranes was tested at four different biogas plants. Two of them were using agricultural substrates. The third one was constructed at a municipal wastewater plant and sludge was fermented in a digester and finally in the fourth case biogas was extracted from municipal waste landfill site. Differences in the concentration of bio-methane in feed in all cases were observed and trace compounds were detected as well. High selectivity polyimide membranes, in proper module arrangements, can provide a product of high methane content in all cases. The content of other trace compounds, such as hydrogen sulphide, water vapour and oxygen on the product did not exceed the values stated by standard for a biogas as a vehicle fuel. The traces of hydrogen sulphide and water vapour penetrated faster to the waste stream enriched in carbon dioxide, which could lead to further purification of the product – methane being hold in the retentate (H2O > H2S > CO2 > O2 > CH4 > N2). In the investigated cases, when concentration of N2 was low and concentration of CH4 higher than 50%, it was possible to upgrade methane to concentration above 90% in a two-stage cascade. To performsimulation ofCH4 andCO2 permeation through polyimide membrane,MATLABwas used. Simulation program has included permeation gaseous mixture with methane contents as observed at field tests in the range of 50 and 60% vol. The mass transport process was estimated for a concurrent hollow fibre membrane module for given pressure and temperature conditions and different values of stage cut. The obtained results show good agreement with the experimental data. The highest degree of methane recovery was obtained with gas concentrating in a cascade with recycling of the retentate.
    Źródło:
    Chemical and Process Engineering; 2019, 40, 2; 235--260
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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