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Wyszukujesz frazę "Szwast, M." wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
A Mathematical Model of Membrane Gas Separation with Energy Transfer by Molecules of Gas Flowing in a Channel to Molecules Penetrating this Channel from the Adjacent Channel
Autorzy:
Szwast, M.
Szwast, Z.
Powiązania:
https://bibliotekanauki.pl/articles/185043.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
membrane
membrane module
reciprocal transfer of energy between gas molecules
changes of the pressure of gas along the length of flow channel
membrana
wzajemne przekazywanie energii między cząsteczkami gazu
zmiany ciśnienia gazu na długości kanału przepływowego
Opis:
The paper presents the mathematical modelling of selected isothermal separation processes of gaseous mixtures, taking place in plants using membranes, in particular nonporous polymer membranes. The modelling concerns membrane modules consisting of two channels – the feeding and the permeate channels. Different shapes of the channels cross-section were taken into account. Consideration was given to co-current and counter-current flows, for feeding and permeate streams, respectively, flowing together with the inert gas receiving permeate. In the proposed mathematical model it was considered that pressure of gas changes along the length of flow channels was the result of both – the drop of pressure connected with flow resistance, and energy transfer by molecules of gas flowing in a given channel to molecules which penetrate this channel from the adjacent channel. The literature on membrane technology takes into account only the drop of pressure connected with flow resistance. Consideration given to energy transfer by molecules of gas flowing in a given channel to molecules which penetrate this channel from the adjacent channel constitute the essential novelty in the current study. The paper also presents results of calculationsobtained by means of a computer program which used equations of the derived model. Physicochemical data concerning separation of the CO2/CH4 mixture with He as the sweep gas and data concerning properties of the membrane made of PDMS were assumed for calculations.
Źródło:
Chemical and Process Engineering; 2015, 36, 2; 151-169
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
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:
Influence of supercritical carbon dioxide on structure and mechanical properties of porous polypropylene membranes
Autorzy:
Krzysztoforski, J.
Krasiński, A.
Henczka, M.
Piętkiewicz, W.
Szwast, M.
Powiązania:
https://bibliotekanauki.pl/articles/115629.pdf
Data publikacji:
2012
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
supercritical fluid
membrane
TIPS
supercritical carbon dioxide
Opis:
The infl uence of supercritical carbon dioxide (scCO2) on structure and mechanical properties of porous polypropylene tubular membranes subjected to diff erent process conditions was investigated. The membranes were treated with scCO2 at pressure of 18 MPa and at three diff erent temperatures (40°C, 70°C, and 100°C) for 2 h in a batch reactor. The obtained samples were analyzed using a scanning electron microscope (SEM) to determine the impact on the membrane structure, tensile testing for ultimate strength assessment, and bubble point test for determination of the pore size distribution and the fi ltration coeffi cient (UFC). A membrane not treated with scCO2 was used as reference sample for comparison. SEM pictures of side surfaces and cross-sections of treated tubular membranes did not reveal any changes in membrane structure. Tensile testing of treated and non-treated samples showed that after scCO2 treatment the ultimate strength slightly decreased (less than 10%), while the Young’s modulus was reduced by almost 50%. The bubble point test showed that scCO2 causes an increase in the number of pores and an increase in the UFC value. In the range 40–100°C no signifi cant temperature dependence was observed. The results confi rm that supercritical carbon dioxide can be used as a medium in porous polypropylene membrane production, maintenance and modifi cation.
Źródło:
Challenges of Modern Technology; 2012, 3, 4; 20-25
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Membrany polimerowe modyfikowane tlenkiem cynku - metoda wytwarzania
Polymer membranes modified by zinc oxide - method of preparation
Autorzy:
Bojarska, M.
Szwast, M.
Jakubiak, Sz.
Michalski, J.
Gradoń, L.
Powiązania:
https://bibliotekanauki.pl/articles/2072155.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
membrany
modyfikacja
nanopręciki tlenku cynku
membrane
modification
zinc oxide nanowires
Opis:
W pracy zaproponowano wytworzenie membrany mikrofiltracyjnej zmodyfikowanej nanopręcikami tlenku cynku, co zapobiega niekorzystnemu zjawisku biofoulingu. Wykorzystano kapilarne membrany polipropylenowe Połymemtech o średniej średnicy porów ok. 0,3 um, najczęściej stosowane w procesie mikrofiltracji. Wzrost nanopręcików tlenku cynku prowadzono dwiema metodami: metodo hydrotermiczną i poprzez depozycję chemiczną. Druga metoda wydaje się najbardziej obiecującą. Zgodnie z nią zaszczepiono centra nukleacji na powierzchni membrany, a wzrost nanopręcików tlenku cynku odbywał się w temperaturze 85°C przez 40 min w roztworze zawierającym amoniak, octan cynku oraz 2-etanoloaminę. Uzyskano równomierne i gęste upakowanie nanopręcików tlenku cynku na powierzchni membrany, a ich długość była nieco mniejsza niż 100 nm.
The preparation of modified microfiltration membrane with zinc oxide nanowires which prevents the adverse phenomena of biofouling is proposed in the paper. The Polymemtech polypropylene capillary membrane having an average pore diameter of about 0.3 цт, most often applied in microfiltration, was used. Growth of zinc oxide nanowires were carried out by hydro- thermal and chemical deposition methods. The second method seems to be the most promising. According to it, nucleation centers were seeded on the membrane surface and zinc oxide nanowires grow at temperature of 85°C for 40 min in a solution containing ammonia, zinc acetate and 2-ethanol- amine. Even and dense packing of zinc oxide nanowires with length slightly less than 100 nm was obtained on membrane surface.
Źródło:
Inżynieria i Aparatura Chemiczna; 2013, 6; 521--522
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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