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    Wyświetlanie 1-7 z 7
    Tytuł:
    High performance fluidized bed photoreactor for ethylene decomposition
    Autorzy:
    Rychtowski, Piotr
    Miądlicki, Piotr
    Prowans, Bartłomiej
    Tryba, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/2106485.pdf
    Data publikacji:
    2022
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    ethylene degradation
    photocatalytic bed reactor
    fluidization
    TiO2
    Opis:
    Removal of C2H4 in the air was carried out in the continuous flow reactor with the photocatalytic bed (expanded polystyrene spheres coated by TiO2 or SiO2/TiO2) under irradiation of UV light. Continuous flow of a gas stream through the reactor was realised at the static bed and under bed fluidization. The required flow of a gas stream through the reactor for bed fluidisation was 500–700 ml/min, whereas for the static bed the flow rate of 20 ml/min was used. Fluidized bed reactor appeared to be much more efficient in ethylene removal than that with the stationary bed. It was caused by the increased speed of C2H4 mass transfer to the photocatalyst surface and better utilization of the incident UV light. In the fluidized bed reactor calculated rate of C2H4 degradation was around 10 μg/min whereas in the stationary state 1.2 μg/min only.
    Źródło:
    Polish Journal of Chemical Technology; 2022, 24, 2; 50--56
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Retrofitting Heat Exchanger Network of Industrial Ethylene Glycol Plant using Heat Integration based on Pinch Analysis
    Autorzy:
    Ali, Emad
    Wazeer, Irfan
    Almutlaq, Abdulaziz
    Rallapalli, Jagan
    Hadj-Kali, Mohamed K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106483.pdf
    Data publikacji:
    2022
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Heat Integration
    Pinch Analysis
    Ethylene Glycol
    Minimum Utility
    Opis:
    Heat integration by pinch method is used to modify the heat exchanger network of an industrial ethylene glycol plant. The aim is to reduce the energy cost by operating the plant close to the maximum energy recovery. Pinch analysis identified a pinch temperature of 483 K, a minimum heating utility of 13,490.9 MJ/ton EO, and a minimum cooling utility of 25,697 MJ/ton EO. Using the pinch decomposition diagram and the standard procedure for matching hot and cold streams, a retrofit of the heat exchangers network is developed. The modified heat exchanger network reduces the external cooling duty by 45.5% and the external heating duty by 93.3%. This promising cost savings provide enough justification for restructuring the existing ethylene glycol plant. Moreover, an additional 6% reduction in the external cooling duty can be achieved by integrating the steam turbine below the pinch point.
    Źródło:
    Polish Journal of Chemical Technology; 2022, 24, 2; 8--20
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Co2 on the Catalytic Performance Of La2O3/CeO2 and CaO/CeO2 Catalysts in the Oxidative Coupling of Methane
    Autorzy:
    Litawa, B.
    Michorczyk, P.
    Ogonowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779348.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    CO2 effect
    OCM
    lanthanum oxide
    calcium oxide
    ethylene
    Opis:
    In this work the La2O3/CeO2 (33 mol % of La) and CaO/CeO2 (33 mol % of Ca) catalysts were prepared by the impregnation method and characterized by XRD and CO2-TPD. The catalytic properties of the catalysts were tested in the OCM process at 1073 K using the methane/oxygen mixture of the mole ratio 3.7 or 2.5 additionally containing CO2 and helium balance. It was found that in the presence of both catalysts an addition of CO2 enhances the selectivity to the ethylene and ethane and it does not have Any negative infl uence on methane conversion. In the case of the CaO/CeO2 catalyst the promoting effect of CO2 was the highest. When the partial pressure of CO2 equals to 39 kPa the increase in selectivity from 36 to 41% was noted while the conversion of methane equal to 19.4-19.7 %.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 1; 22-26
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of compounds emitted during thermo-oxidative decomposition of polyester fabrics
    Autorzy:
    Dzięcioł, M.
    Huzar, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/779686.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    polyester fabrics
    poly(ethylene terephthalate)
    thermooxidative decomposition of polyesters
    combustion of polyesters
    Opis:
    Compounds emitted during thermo-oxidative decomposition of three commercial polyester fabrics for indoor outfit and decorations (upholstery, curtains) were studied. The experiments were carried out in a flow tubular furnace at 600oC in an air atmosphere. During decomposition process the complex mixtures of volatile and solid compounds were emitted. The main volatile products were carbon oxides, benzene, acetaldehyde, vinyl benzoate and acetophenone. The emitted solid compounds consisted mainly of aromatic carboxylic acids and its derivatives, among which the greatest part took terephthalic acid, monovinyl terephthalate and benzoic acid . The small amounts of polycyclic aromatic hydrocarbons were also emitted. The emission profiles of the tested polyester fabrics were similar. The presence of toxic compounds indicates the possibility of serious hazard for people during fire.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 1; 40-45
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polyetherols from melamine cyanurate and ethylene carbobate – synthesis and application
    Autorzy:
    Kijowska, D.
    Legocka, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/778889.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    cyjanuran melaminy
    węglan etylenu
    polieterole
    pianki poliuretanowe
    melamine cyanurate
    ethylene carbonate
    polyetherols
    polyurethane foams
    Opis:
    The results of the study on the reactions of melamine cyanurate with ethylene carbonate were presented. As a result of the reactions, polyetherols containing thermostabile 1,3,5-triazine and perhyroxo-1,3,5-triazine rings in their structure were obtained. Basic physical properties such as density, viscosity, hydroxyl number, weight changes were measured. The polyetherols were applied as a polyol component to receiving of thermoresistant polyurethane foams. Some of the properties of the obtained foams were investigated. The value of the apparent density is between 51 and 71 kg/m3, compressive strength 222–356 kPa and the content of the open pores between 14–33%. Thermal resistance was also studied by means of the TGA method. It was found that oxygen index of the selected compositions is between 20–22%.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 3; 42-46
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of carbon nanotubes using cvd CVD method
    Autorzy:
    Pełech, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/779224.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    nanomateriał węglowy
    katalizator żelaza
    rozkład etylenu
    uwodornienia
    iron catalyst
    carbon nanomaterials
    ethylene decomposition
    hydrogenation
    Opis:
    In this work preparation and characteristic of modified nanocarbons is described. These materials were obtained using nanocrystalline iron as a catalyst and ethylene as a carbon source at 700°C. The influence of argon or hydrogen addition to reaction mixture was investigated. After ethylene decomposition samples were hydrogenated at 500°C. As a results iron carbide (Fe3C) in the carbon matrix in the form of multi walled carbon nanotubes was obtained. After a treatment under hydrogen atmosphere iron carbide decomposed to iron and carbon and small iron particles agglomerated into larger ones.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 3; 45-49
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complexation of poly(ethylene glycol) with poly(ethyl methacrylate-co-N-vinyl-2-pyrrolidone) gel based on hydrogen bonds
    Autorzy:
    Liu, G.
    Xie, D.
    Guan, Ch.
    Powiązania:
    https://bibliotekanauki.pl/articles/778809.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    complex
    hydrogen bonds
    poly(ethyl methacrylate-co-N-vinyl-2-pyrrolidone) gel
    poly(ethylene glycol)
    Opis:
    The complexes of poly(ethyl methacrylate-co-N-vinyl-2-pyrrolidone) (P(EMA-co-VP)) gel with poly- (ethylene glycol) (PEG) stabilized by the hydrogen bonds were prepared. It was found that both the concentration and the molecular weight of PEG have a strong effect on the P(EMA-co-VP) gel. When PEG was introduced into the P(EMA-co-VP) gel, the glass transition temperatures (Tg) of the complexes decreases with the decreasing of PEG molecular weight. In such a system, the maximum molecular weight of PEG required for the complex formation is no more than 2000, and P(EMA-co-VP)/PEG complexes are a homogeneous amorphous phase, which was studied by FTIR, XRD, TEM, and DSC.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 3; 85-90
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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