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    Wyświetlanie 1-14 z 14
    Tytuł:
    Oligomerization of hexafluoropropylene oxide in the presence of alkali metal halides
    Autorzy:
    Meissner, E.
    Wróblewska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/777879.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    tlenek heksafluoropropylenu
    oligomeryzacja
    oligomery tlenku heksafluoropropylenu
    heksafluoropropylene oxide
    oligomers of hexafluoropropylene oxide
    Opis:
    Oligomers of hexafluoropropylene oxide are raw materials for the synthesis of compounds having unique properties such as high chemical and thermal resistance. Two basic parameters have influence on the process of hexafluoropropylene oxide oligomerization: the kind of the catalyst and the solvent. The temperature and pressure influence this process to a lesser extent. The influence of halide ions, the solvent and the temperature on the oligomerization of hexafluoropropylene oxide has been studied.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 3; 95-97
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the influence of parameters on hexafluoropropylene oxide oligomerization in the presence of complex amines
    Autorzy:
    Meissner, E.
    Wróblewska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/777883.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    tlenek heksafluoropropylenu
    oligomery tlenku heksafluoropropylenu
    hexafluoropropylene oxide
    oligomers of hexafluoropropylene oxide
    Opis:
    Oligomers of hexafluoropropylene oxide were tested as potential materials for obtaining various compounds with unique properties, of which most important are chemical and thermal resistance. Two basic parameters influence the oligomerization process of hexafluoropropylene oxide: the type of the catalyst and the type of the solvent. Other parameters such as temperature and pressure have significantly less influence. The influence of tertiary amines as catalyst, the type of the solvent, temperature, pressure and catalyst concentration were tested in the process of hexafluoropropylene oxide oligomerization.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 3; 98-100
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxidation of hexafluoropropylene with molecular oxygen
    Autorzy:
    Meissner, E.
    Wróblewska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778427.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    heksafluoropropylen
    tlenek heksafluoropropylenu
    epoksydacja
    oligomeryzacja
    Opis:
    The results of the oxidation of hexafluoropropylene (HFP) to hexafluoropropylene oxide (HFPO) have been presented. The oxidation was carried out in an autoclave within the range of temperatures of 120 - 170°C and in the presence of an organic solvent (carbon tetrachloride). Molecular oxygen was used here as an oxidizing agent. The influence of: the molar ratio of HFP/O from 13.4 to 4.09:1, the process temperature, the addition of inert gas (nitrogen) from 4 to 18 atm and the periodical dosing of oxygen were investigated. The functions describing the process were: the conversion of HFP and the yield of HFPO in relation to HFP consumed. The presented process is very interesting owing to a wide application of HFPO.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 1; 20-22
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epoxidation of 2-buten-1-ol over Ti-MCM-41 and Ti-MCM-48 titanium silicalite catalysts
    Autorzy:
    Wróblewska, A.
    Ławro, E.
    Milchert, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/777986.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    epoksydacja
    2,3-epoksybutan-1-ol
    Ti-MCM-41
    Ti-MCM-48
    epoxidation
    2,3-epoxybutan-1-ol
    Opis:
    The results of the epoxidation of 2-buten-1-ol with 30 wt% hydrogen peroxide have been presented. As a solvent methanol was used. The process was carried out over the titanium silicalite catalysts: Ti-MCM-41 and Ti-MCM-48. The influence of temperature (20 - 120°C). the molar ratio of CRA/H2O2 (5:1 - 5:1), methanol concentration (5 - 90 wt%), catalyst concentration (0.1 - 5.0 wt%) and the reaction time (30 -300 min) was investigated. The obtained results were used for the determination of optimum conditions of running the epoxidation process of 2-buten-1-ol.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 3; 1-4
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on the deactivation of Ti-MCM-41 catalyst in the process of allyl alcohol epoxidation
    Autorzy:
    Wróblewska, A.
    Makuch, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/778158.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    titanium silicate Ti-MCM-41 catalyst
    deactivation of Ti-MCM-41catalyst
    regeneration of Ti-MCM-41catalyst
    Opis:
    The synthesis of Ti-MCM-41 catalyst was performed. The obtained catalyst was characterized by the following instrumental methods: UV-vis, IR spectroscopy, XRD, and X-ray microanalysis. The activity of the obtained catalyst was tested in the process of allyl alcohol epoxidation with 30 wt.% hydrogen peroxide in methanol as a solvent and under atmospheric pressure. In the next stage, recovery of Ti-MCM-41 catalyst from the post-reaction mixture and its regeneration by washing with appropriate solvents and drying were conducted. In the case of total loss of the activity of the catalyst, calcination of the catalyst was also carried out. The loss of titanium from the structure of Ti-MCM-41 catalyst and a partial collapsing of the structure of this catalyst can be the main reason of the decrease the activity of the catalyst what was manly visible in the decrease of the values of two functions of this process: the allyl alcohol conversion and conversion of hydrogen peroxide to organic compounds.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 4; 111-115
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characteristics of titanium silicalite TS-1, Ti-Beta and Ti-MWW catalysts
    Autorzy:
    Wróblewska, A.
    Fajdek, A.
    Milchert, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/779396.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    TS-1
    Ti-Beta
    Ti-MWW
    titanium-silicalite catalysts
    Opis:
    The synthesis methods of the following titanium-silicalite catalysts: TS-1, Ti-Beta and Ti-MWW were presented. The results of the analyses of the catalysts by XRD, SEM and IR, UV-vis methods were also shown. A brief description of the catalytic performances of these catalysts in the oxidation process of olefins, alkenes, alcohols and aromatic compounds was presented.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 1; 64-71
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epoxidation of crotyl alcohol in the presence of titanium silicalite Ti-MWW catalyst – the new and friendly method of 2,3-epoxybutane-1-ol synthesis
    Autorzy:
    Wróblewska, A.
    Fajdek, A.
    Milchert, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/779457.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Ti-MWW
    krotyl epoksydacji alkoholu
    2,3-epoksybutan-1-ol
    crotyl alcohol epoxidation
    2,3-epoxybutane-1-ol
    Opis:
    Epoxidation of crotyl alcohol (CA) with 30 wt% hydrogen peroxide over Ti-MWW catalyst has been studied with methanol as a solvent and at autogenic pressure. The influence of temperature in the range of 20 – 120oC, the molar ratio of CA/H2O21:1-5:1, methanol concentration 5 – 90 wt%, Ti-MWW catalyst concentration 0.0 – 5.0 wt% and the reaction time 5 – 300 min have been studied. The main product of CA epoxidation is 2,3-epoxybutane-1-ol (2,3EB1O), a compound with many applications.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 2; 57-61
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The oxidation of limonene at raised pressure and over the various titanium-silicate catalysts
    Autorzy:
    Wróblewska, A.
    Makuch, E.
    Miądlicki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779024.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    limonene oxidation
    hydrogen peroxide
    TBHP
    Opis:
    This work presents the studies on the oxidation of limonene with hydrogen peroxide and tert-butyl hydroperoxide (TBHP) in the presence of : TS-2, Ti-Beta, Ti-MCM-41 and Ti-MWW catalysts, at the autogenic pressure and atmospheric pressure. The examination were performed at the following conditions: the temperature of 140°C (studies in the autoclave) and 80°C (studies in glass reactor), the molar ratio of limonene/oxidant (H2O2 or WNTB) = 1:1, the methanol concentration 80 wt%, the catalyst content 3 wt%, the reaction time 3 h and the intensity of stirring 500 rpm. The analysis of the results showed that in process not only 1,2-epoxylimonene was formed but also: 1,2-epoxylimonene diol, carveol, carvone and perillyl alcohol but for 1,2-epoxylimonene obtaining the better method was the method at the autogenic pressure and in the presence of TBHP.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 82-87
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isolation of 1,2-epoxybutane-3-ol and 2,3-epoxybutane-1-ol from post-reaction mixtures
    Autorzy:
    Wróblewska, A.
    Wajzberg-Prokowska, J.
    Ławro, E.
    Milchert, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/779569.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    cienka powłoka destylacyjna
    izolacja epoksydowa
    thin film distillation
    isolation of epoxides
    Opis:
    Attempts were made to isolate 1,2-epoxybutane-3-ol and 2,3-epoxybutane-1-ol from post-reaction mixtures left after the epoxidation of 1-butene-3-ol and 2-butene-1-ol with hydrogen peroxide by thin film distillation. From the raw mixture containing about 8.3 wt% of the epoxide at the first stage the concentration of epoxide is increased to 32 wt%. At the second stage of distillation the epoxide fraction is concentrated to about 76 wt%. After the third stage of thin film distillation the epoxide fraction of 99.6% purity can be obtained. The concentration of this fraction by azeotropic distillation with n-propanol as an azeotropic agent permits obtaining epoxide of 99.6 wt% purity.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 2; 29-32
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epoxidation of natural limonene extracted from orange peels with hydrogen peroxide over Ti-MCM-41 catalyst
    Autorzy:
    Wróblewska, A.
    Miądlicki, P.
    Makuch, E.
    Benedyczak, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/777909.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Opis:
    The paper presents the oxidation of natural limonene (extracted from waste orange peels) by 60 wt% hydrogen peroxide, in the presence of Ti-MCM-41 catalyst and in methanol as the solvent. The aim of the research was to develop the most favorable technological parameters for the process of limonene oxidation (temperature, molar ratio of limonene to hydrogen peroxide, methanol concentration, Ti-MCM-41 catalyst content and reaction time) by analyzing changes in the main functions describing this process: the conversion of limonene, selectivities of appropriate products, the conversion of hydrogen peroxide and the effective conversion of hydrogen peroxide. The process is environmentally friendly process and it uses renewable raw material - limonene and a safe oxidant -hydrogen peroxide. During the study, very valuable oxygenated derivatives of limonene were obtained: 1,2-epoxylimonene, its diol, carvone, carveol, and perillyl alcohol. These compounds are used in medicine, cosmetics, perfumery, food and polymers industries.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 1; 1-6
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Ti-MWW catalyst - its characteristic and catalytic properties in the epoxidation of allyl alcohol by hydrogen peroxide
    Autorzy:
    Wróblewska, A.
    Fajdek, A.
    Milchert, E.
    Grzmil, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/778365.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Ti-MWW
    katalizatory tytanowo-silikalitowe
    glicydol
    epoksydacja w fazie ciekłej
    nadtlenek wodoru
    titanium-silicalites
    glycidol
    liquid phase epoxidation
    hydrogen peroxide
    Opis:
    Ti-MWW, one of the latest titanium-silicalite catalysts, has been prepared by direct hydrothermal synthesis using hexamethyleneimine as a structure-directing agent. The characteristic of the catalyst was performed by means of the following methods: XRD, SEM, IR, UV-vis and X'Ray microanalysis. The catalytic properties of Ti-MWW have been compared with those of the conventional titanium-silicalites TS-1 and TS-2 in the epoxidation of allyl alcohol with hydrogen peroxide. The process has been described by the following main functions: the selectivity of the transformation to glycidol in relation to allyl alcohol consumed, the conversions of the substrates (allyl alcohol and hydrogen peroxide) and the selectivity of the transformation to organic compounds in relation to hydrogen peroxide consumed.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 1; 29-34
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The pressure method of 1-butene-3-ol epoxidation over Ti-beta catalyst
    Autorzy:
    Wróblewska, A.
    Wajzberg, J.
    Milchert, E.
    Grzmil, B.
    Ziebro, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779807.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    epoksydacja w fazie ciekłej
    1,2-epoksy-3-butanol
    katalizator Ti-Beta
    liquid phase epoxidation
    1,2-epoxy-3-butanol
    Ti-Beta catalyst
    Opis:
    The investigations of 1-buten-3-ol (1B3O) epoxidation by 30% hydrogen peroxide over Ti-Beta catalyst were performed. The experiments were carried out under the autogenic pressure and at the presence of methanol as a solvent. The influence of the following technological parameters on the course of epoxidation: temperature (20 - 120°C), the molar ratio of 1B3O/H2O2 (0.5:1 - 5:1), methanol concentration (5 - 90 wt%.), Ti-Beta concentration (0.1 - 5.0 wt%) and the reaction time (0.5 - 5.0 h) was investigated. The main functions describing the process were: the selectivity of transformation to 1,2-epoxy-3-butanol in relation to 1B3O consumed, conversions of substrates as well as the selectivity of transformation to organic compounds in relation hydrogen peroxide consumed.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 2; 53-56
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fragrant films on the basis of potato starch
    Autorzy:
    Drewnowska, E.
    Antosik, A. D.
    Wróblewska, A.
    Czech, Z.
    Wilpiszewska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/778537.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    fragrant starch-based films
    biodegradability
    starch
    α-pinene
    eugenol
    Opis:
    New fragrant and biodegradable starch-based films have been obtained. These films were prepared by the method of the outpour into the Teflon mould of the starch composition containing such fragrant compounds as: eugenol or α-pinene. For characterizing the final products the following properties were taken into account: the solubility in water, the absorbance of moisture from air and the length of release of the fragrant compound. The obtained starch-based films were characterized by the relatively long time of release the fragrant compound and also by the good absorbance of moisture from air. Taking into account the properties of the obtained films, they can find applications in production of appliances used in the bioactive cleaning of air. The prototype of such a product was presented in this work. The presented studies show the potential of applying these materials in the future, and thus these examinations should be developed.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 2; 88-92
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The utilization of the mesoporous Ti-SBA-15 catalyst in the epoxidation of allyl alcohol to glycidol and diglycidyl ether in the water medium
    Autorzy:
    Wróblewska, A.
    Makuch, E.
    Dzięcioł, M.
    Jędrzejewski, R.
    Kochmański, P.
    Kochmańska, A.
    Kucharski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/777977.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    glycidol
    diglycidyl ether
    Ti-SBA-15 catalyst
    allyl alcohol epoxidation
    hydrogen peroxide
    Opis:
    This work presents the studies on the optimization the process of allyl alcohol epoxidation over the Ti-SBA-15 catalyst. The optimization was carried out in an aqueous medium, wherein water was introduced into the reaction medium with an oxidizing agent (30 wt% aqueous solution of hydrogen peroxide) and it was formed in the reaction medium during the processes. The main investigated technological parameters were: the temperature, the molar ratio of allyl alcohol/hydrogen peroxide, the catalyst content and the reaction time. The main functions the process were: the selectivity of transformation to glycidol in relation to allyl alcohol consumed, the selectivity of transformation to diglycidyl ether in relation to allyl alcohol consumed, the conversion of allyl alcohol and the selectivity of transformation to organic compounds in relation to hydrogen peroxide consumed. The analysis of the layer drawings showed that in water solution it is best to conduct allyl alcohol epoxidation in direction of glycidol (selectivity of glycidol 54 mol%) at: the temperature of 10–17°C, the molar ratio of reactants 0.5–1.9, the catalyst content 2.9–4.0 wt%, the reaction time 2.7–3.0 h and in direction of diglycidyl ether (selectivity of diglycidyl ether 16 mol%) at: the temperature of 18–33°C, the molar ratio of reactants 0.9–1.65, the catalyst content 2.0–3.4 wt%, the reaction time 1.7–2.6 h. The presented method allows to obtain two very valuable intermediates for the organic industry.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 23-31
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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