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Removal of metal ions from aqueous solutions by micellar enhanced ultra-filtration (MEUF)

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Staszak K., Redutko B., Prochaska K.
Polish Journal of Chemical Technology
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2010
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vol. 12
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issue 3
62-65
EN
The results of preliminary research on the possibility of removing of chromium(III) and copper(II) ions from micellar solutions in MEUF were described. The effectiveness of metal ions removal in the classical UF and MEUF was compared. It was confirmed that in the classical UF the retention of metal ions is small, independent of the concentration of the feed solution. The cross-flow micellar enhanced ultrafiltration experiments showed the usefulness of this method for the separation of metal ions from micellar solutions. The retention of metal ions in MEUF process is almost total in the case of the solutions of low concentration. However, for more concentrated solutions the retention is much smaller.
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Equilibrium and rate of iron(III) extraction from chloride solutions by individual hydrophobic extractants and their mixtures

100%
Staszak K., Cierpiszewski R., Prochaska K.
Polish Journal of Chemical Technology
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2011
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vol. 13
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issue 1
1-5
EN
The main goal of this work was to study and compare the rate of iron(III) extraction from chloride solutions by commercial extractants: Alamine 336, TOPO and LIX 54 and their mixtures. Using the interfacial tension data, obtained for mixed systems, the values of surface mole fraction and molecular interaction parameter of extractants were estimated. Determination of the extraction rates was performed by using the Lewis-type stirred transfer cell. It was found that the extraction efficiency of extractants are changed in the following order: Alamine 336>TOPO>β-diketone. The addition of a chelating extractant to the system decreases the extraction efficiency, for example the addition of β-diketone to TOPO decreases the extraction efficiency by about 50%.
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Application of nanofiltration in the process of the separation of model fermentation broths components

88%
Staszak K., Woźniak M. J., Karaś Z., Staniewski J., Prochaska K.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 4
1-4
EN
The effectiveness of nanofiltration with the use of ceramic membranes in the process of concentration and separation of fumaric acid or succinic acid from glycerol and citric acid from erythritol was evaluated. It was found that the retention of sodium salts of the acids investigated increased strongly with increasing the pH of the feed solution (depending on the degree of dissociation), while the retention degrees of di- and tricarboxylic acids, erythritol or glycerol were lower than 2%, irrespective of the initial concentration of the solution to be filtered. The results obtained showed that nanofiltration can be considered as one of the purification steps in the process of recovery of salts of organic acids from fermentation broth.
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