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    Wyświetlanie 1-3 z 3
    Tytuł:
    Extraction equilibria of hypophosphorous, phosphorous and phosphoric acids by toluene solution of tri-n-octylamine
    Autorzy:
    Sana, T.
    Shiomori, K.
    Kawano, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/347049.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    hypophosphorous acid
    phosphorous acid
    phosphoric acid
    tri-n-octylamine
    extraction equilibrium
    Opis:
    The extraction equilibria of hypophosphorous, phosphorous and phosphoric acids with tri-n-octylamine as an extractant in toluene were measured at 303K. Under these conditions, undissociated acid (A’) reacts with the amine (B) to form various complexes in toluene. The complexes formed and equilibrium constants were estimated by a graphical analysis method. The complexes formed in these systems were found to be A’nB type species for hypophosphorous acid, A’nBm type species for phosphorous acid, (A'B)n type species for phosphoric acid, respectively. The experimental results could be explained by reaction models and equilibrium constants for each acid.
    Źródło:
    Ars Separatoria Acta; 2003, 2; 125-138
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction rate of nickel in aqueous ammonium sulfate solution with 5-dodecylsalicylaldoxime in kerosene
    Autorzy:
    Sana, T.
    Fujii, R.
    Shiomori, K.
    Kawano, Y.
    Nagayoshi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/346929.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    nickel
    5-dodecylsalicylaldoxime
    extraction rate
    interfacial reaction
    Lewis type transfer cell
    Opis:
    In order to clarify the adsorption equilibrium for the species of the extractant and the extraction complex, the interfacial tensions between the aqueous and the organic solutions were investigated, using equilibrated kerosene solution in the presence of 5-dodecylsalicylaldoxime (LIX® 860-IC) and aqueous solution in the presence and absence of nickel ion. The interfacial tensions decreased with increasing in the concentration of LIX® 860-IC. Experimental results of the interfacial tension were analyzed by Gibb’s adsorption isotherm. The adsorption equilibrium constant and the interfacial area for the extractant and the extraction complex were determined. The extraction rate of nickel from the aqueous ammonium sulfate solution with LIX® 860-IC in kerosene was investigated using a Lewis-type transfer cell. The concentration effects of extractant, nickel, and hydrogen ion on the extraction rate were examined. The extraction rate increased with increasing in the concentrations of nickel and the extractant, and approached to constant values depending on the extractant concentration at a high concentration of nickel. The rate increased with decreasing in the concentration of hydrogen ion, and approached to constant values depending on the extractant concentration. These results were analysed based on an interfacial reaction model in which the reaction proceeds between an extractant species adsorbed at the interface and nickel ion in the aqueous solution. The extraction rate is interpreted based on the rate equation in which the interfacial reaction between a 1:1 nickel chelate complex species adsorbed at the interface and the extractant in the organic solution is the rate-determining step. The reaction rate constants and equilibrium constants were determined.
    Źródło:
    Ars Separatoria Acta; 2002, 1; 35-44
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Back-extraction mechanism of lysozyme from reverse micelles in sodium bis 2-ethylhexyl sulfosuccinate and long chain alkyl amine mixed systems
    Autorzy:
    Shiomori, K.
    Honbu, T.
    Sana, T.
    Kawano, Y.
    Kuboi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/346923.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    reverse micelles
    lysozyme
    back-extraction
    long chain alkyl amine
    Opis:
    Extraction and back-extraction of lysozyme are investigated using a mixed micellar system of sodium bis(2-ethylhexyl) sulfosuccinate and long chain alkyl amines. Either di-n-octylamine or di-2-ethylhexylamine is used as the amine added. In these systems, reverse micelles is not formed at acidic pH range. Lysozyme extracted at pH which is slightly lower than the isoelectric point of lysozyme is successfully back-extracted by destruction of the micelles at acidic pH range. By increasing the amine concentration, the pH values, at which the back-extraction of lysozyme began, are raised, and the activity of the back-extracted lysozyme decreases. Linear relationship between the concentration of the amine added in the system and that of lysozyme back-extracted exists .
    Źródło:
    Ars Separatoria Acta; 2002, 1; 45-54
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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