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Wyszukujesz frazę "membrane separation" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Mathematical models of the air separation through polymer membranes at magnetic field
    Autorzy:
    Strzelewicz, A.
    Grzywna, Z. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/346951.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    diffusion
    membrane
    time lags
    gas mixtures
    air separation
    Opis:
    This paper is addressed to the membrane air separation i.e. the gas mixture of quite similar gases in many respects, except one: oxygen is paramagnetic whereas nitrogen is diamagnetic. This fact forms the basis for their separation. The numerical studies and theoretical predictions concerning the air membrane separation in the presence of a magnetic field are discussed. Some experimental data concerning the „magnetic membranes” i.e. ethylcellulose membranes with neodymium powder, are also presented.
    Źródło:
    Ars Separatoria Acta; 2007, 5; 34-44
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of chromium(iii) transport through the double-carrier supported liquid membrane
    Autorzy:
    Religa, P.
    Rajewski, J.
    Lobodzin, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/109375.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    SLM
    chromium
    D2EHPA
    Cyanex27
    separation
    membrane
    Opis:
    The kinetics of chromium(III) transport through a supported liquid membrane containing both a di-(2-ethylhexyl) phosphoric acid (D2EHPA) and bis-(2,4,4-trimethylpentyl) phosphinic acid (Cyanex272) as an ions carrier was investigated. It was found that under a characteristic concentration of the carriers into the organic phase membrane provides much higher efficiency than the membrane containing only one of the extractants. In the studied system the optimal carrier concentration in the membrane is 0.16 mol/dm3 and 0.9 mol/dm3 for Cyanex272 and D2EHPA, respectively. Moreover, the authors indicate that only D2EHPA can act as an individual carrier in the membrane. In the case of Cyanex272 the stable structures with chromium(III) ions are formed in the membrane, which prevents effective re-extraction. Additionally, intensive stirring of an aqueous phase in another factor that has a positive influence on the transport kinetics in the double-carrier membrane. Increasing a stirring rate up to 1200 rpm shortens the process time and allows total re-extraction of chromium.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 87-97
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical interpretation of a mathematical model of membrane gas separation with energy transfer by gas flowing in a channel to gas penetrating this channel from the adjacent channel
    Autorzy:
    Szwast, M.
    Szwast, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/185839.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas separation
    membrane
    mathematical model
    separacja gazów
    membrana
    model matematyczny
    Opis:
    Comparative calculations with a mathematical model designed by the authors, which takes into consideration energy transfer from gas flowing through a given channel to gas which penetrates this channel from an adjacent channel, as well as a model which omits this phenomenon, respectively, were made for the process of separating gas mixtures carried out with an inert sweep gas in the fourend capillary membrane module. Calculations were made for the process of biogas separation using a PMSP polymer membrane, relative to helium as the sweep gas. It was demonstrated that omitting the energy transfer in the mathematical model might lead to obtaining results which indicate that the capacity of the process expressed by the value of feed flux subjected to separation is by several percent higher than in reality.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 2; 209--222
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of carbon footprint from spark ignition power facilities by the dual approach
    Autorzy:
    Janusz-Szymańska, Katarzyna
    Grzywnowicz, Krzysztof
    Wiciak, Grzegorz
    Remiorz, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/1845486.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spark ignition engines
    digestion
    gas
    cofiring
    CO2 emissions
    membrane
    separation
    Opis:
    Power generation units, suitable for individual users and small scale applications, are mainly based on spark ignition engines. In recently performed research, reductions of emissions coming from such units, especially considering carbon dioxide emissions, are deemed as the issue of particular importance. One of solutions, postponed to reduce impact of spark ignition engine-based units on the natural environment, is transition from fossil fuels into renewable gaseous fuels, as products of organic digestion. Nonetheless, development of new solutions is required to prevent further carbon dioxide emissions. The paper presents a novel dual approach developed to reduce carbon dioxide emissions from stationary power units, basing on spark ignition engine. The discussed approach includes both reduction in carbon content in the fuel, which is realized by its enrichment with hydrogen produced using the solar energy-supported electrolysis process, as well as application of post-combustion carbon dioxide separation. Results of the performed analysis suggest profitability of transition from fossil into the hydrogen-enriched fuel mixture, with significant rise in operational parameters of the system following increase in the hydrogen content. Nevertheless, utilization of the carbon dioxide separation leads to vital soar in internal energy demand, causing vital loss in operational and economical parameters of the analyzed system.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 2; 171-192
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the absorbing pervaporation technique for ammonia recovery after the haber process
    Autorzy:
    Atlaskin, A.
    Petukhov, A. N.
    Yanbikov, N. R.
    Salnikova, M.E.
    Sergeeva, M. S.
    Vorotyntsev, V. M.
    Vorotyntsev, I. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/184857.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas separation
    absorbing pervaporation
    ammonia
    process intensification
    membrane
    separacja gazów
    amoniak
    intensyfikacja procesu
    membrana
    Opis:
    A novel absorbing pervaporation hybrid technique has been evaluated experimentally for the recovery of ammonia from the gas mixture in a recycle loop of synthesis plants. This process of hybridization brings together the combination of energy-efficient membrane gas separation based on poly(dimethylsiloxane) poly(diphenylsilsesquioxane) with a high selective sorption technique where a water solution with polyethylene glycol 400 (PEG-400) was used as the liquid absorbent. Process efficiency was studied using the pure and mixed gases. The influence of PEG-400 content in aqueous solutions on process selectivity and separation efficiency was studied. The ammonia recovery efficiency evaluation of an absorbing pervaporation technique was performed and compared with the conventional membrane gas separation. It was shown that the absorbing pervaporation technique outperforms the conventional membrane method in the whole range of productivity, producing the ammonia with a purity of 99.93 vol.% using the PEG 80 wt.% solution. The proposed method may be considered as an attractive solution in the optimization of the Haber process.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 3; 323--333
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Membrany z polidimetylosiloksanów, polisiloksanouretanów i poli(tlenku fenylenu) do separacji gazów i perwaporacji
    Preparation of poly(dimethylsiloxane), poly(siloxane-urethane) and poly(phenylene oxide) membranes for gas separation and pervaporation
    Autorzy:
    Capała, W.
    Zielecka, M.
    Bujnowska, E.
    Kozakiewicz, J.
    Trzaskowska, J.
    Ofat-Kawalec, I.
    Wielgosz, Z.
    Kruzel, A.
    Tomzik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/945858.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    polidimetylosiloksany
    polisiloksanouretany
    poli(tlenek fenylenu)
    membrana
    separacja gazów
    perwaporacja
    poly(dimethylsiloxane)s
    poly(siloxane-urethane)s
    poly(phenylene oxide)
    membrane
    gas separation
    pervaporation
    Opis:
    Przedstawiono prace nad otrzymywaniem membran z polidimetylosiloksanów (PDMS), polisiloksanouretanów i poli(tlenku fenylenu) (PPO). W początkowej fazie prac formowano symetryczne membrany gęste, a na kolejnym etapie polimerowe warstwy aktywne formowano bezpośrednio na komercyjnym, porowatym podłożu ceramicznym lub polimerowym. Membrany testowano w procesie rozdziału modelowej mieszaniny gazowej o składzie 17 % CO2, 5 % O2 i 78 % N2 oraz w procesie perwaporacji próżniowej 5 i 10 % mas. wodnego roztworu acetonu (50 °C). W procesie separacji gazów z zastosowaniem membran z PDMS i z polisiloksanouretanów uzyskano permeaty zawierające 40–60 % CO2, w zależności od rodzaju membrany i warunków procesowych. W wypadku zastosowania membran z PPO stężenie CO2 w permeacie wynosiło 26–35 %. Permeaty w procesie perwaporacji zawierały 50–84 % mas. acetonu, a współczynnik separacji β wynosił 20–57, w zależności od membrany i stężenia nadawy.
    Studies on the formation of poly(dimethylsiloxane) (PDMS), poly(siloxane-urethane) and poly(phenylene oxide) (PPO) membranes and their properties in gas separation and pervaporation have been presented. Dense symmetric membranes were initially formed in the early stages of the studies. In the next stage of the membrane development, active polymeric layers were cast directly on commercially obtained porous ceramic or polymer supports. The properties of the obtained membranes were then evaluated in the separation of amodel gaseous mixture comprising CO2 (17 %), O2 (5 %) and N2 (78 %) as well as in the vacuum pervaporation of aqueous solutions of acetone (5–10 wt %) at 50 °C. Depending on the type of membrane and process parameters, permeates containing 40–60 % CO2 were obtained with the application of PDMS and poly(siloxane-urethane) membranes. 26–35 % CO2 content was achieved in permeates in the case of PPO-derived membranes. The permeates obtained from pervaporation tests contained 50–84 wt % acetone, while the separation factor β was found to be between 20–57 depending on the type of membrane and the concentration of the feed.
    Źródło:
    Polimery; 2016, 61, 10; 693-701
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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