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Author: search.filters.author.Lothongkum, Anchaleeporn W.Subject: search.filters.subject.Liquid membrane

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    Synergistic separation of yttrium ions in lanthanide series from rare earths mixture via hollow fiber supported liquid membrane
    (2009-03-01)
    Ramakul, Prakorn
    ;
    Supajaroon, Tossaporn
    ;
    Prapasawat, Tatchanok
    ;
    Pancharoen, Ura
    ;
    Lothongkum, Anchaleeporn W.
    Separation of yttrium ions from the mixture of rare earths in lanthanide series has been examined by a microporous hydrophobic hollow fiber supported liquid membrane. Cyanex 272 and TBP in kerosene are used separately as an extractant. Nitric acid solution is used as a stripping solution. Increasing the concentration of Cyanex 272 increases the percentages of extraction and stripping of yttrium from rare earths but slightly percentages are obtained by TBP. Interestingly, when TBP is added with Cyanex 272, the percentages of extraction and stripping increases. This is due to the synergistic effect of the extractants. Moreover, yttrium can be selectively extracted and stripped more than other lanthanide ions because the equilibrium constant decreases with an increase in atomic number or decreases with the ionic radius of the lanthanides. In other words, yttrium is separated selectively due to the smallest ionic radius while other lanthanides are separated with a decrease in ionic radius or an increase in atomic number. © 2009 The Korean Society of Industrial and Engineering Chemistry.
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    Separation of As(III) and As(V) by hollow fiber supported liquid membrane based on the mass transfer theory
    (2008-01-01)
    Prapasawat, Tatchanok
    ;
    Ramakul, Prakorn
    ;
    Satayaprasert, Chairit
    ;
    Pancharoen, Ura
    ;
    Lothongkum, Anchaleeporn W.
    Separation of As(III) and As(V) ions from sulphate media by hollow fiber supported liquid membrane has been examined. Cyanex 923 was diluted in toluene and used as an extractant. Water was used as a stripping solution. The extractability of As(V) was higher than As(III). When the concentration of sulphuric acid in feed solution and Cyanex 923 in liquid membrane increased, more arsenic ions were extracted into liquid membrane and recovered into the stripping solution. The mathematical model was focused on the extraction side of the liquid membrane system. The mass transfer coefficients of the aqueous phase (k <inf>i</inf> ) and organic phase (k <inf>m</inf> ) are 7.15×10 <sup>-3</sup> and 3.45×10<sup>-2</sup> cm/s for As(III), and 1.07×10<sup>-2</sup> and 1.79×10<sup>-2</sup> cm/s for As(V). Therefore, the rate-controlling step for As(III) and As(V) in liquid membrane process is the mass transfer in the aqueous film between the feed solution and liquid membrane. The calculated mass transfer coefficients agree with the experimental results. © 2008 Springer.
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    Purely separation of mixture of mercury and arsenic via hollow fiber supported liquid membrane
    (2007-09-01)
    Sangtumrong, Seewalee
    ;
    Ramakul, Prakom
    ;
    Satayaprasert, Chairit
    ;
    Pancharoen, Ura
    ;
    Lothongkum, Anchaleeporn W.
    The separation of mercury(II) and arsenic(III) ions from chloride media has been examined through a hollow fiber supported liquid membrane using tri-n-octylamine (TOA) as an extractant dissolved in toluene. The transport system was studied as a function of several variables: the concentration of the hydrochloric acid feed solutions, the concentration of TOA in the liquid membrane, the concentration of sodium hydroxide in the recovery solutions. According to the system, mercury(II) ions were extracted using TOA by rejecting arsenic (III) ions into raffinate because of the different forms of the mercury(II) and arsenic(III) ions in hydrochloric acid solutions. The maximum percentage of recovery for mercury(II) was 95 %; 100 % selectivity was obtained.