EXTRACTION OF TRANSITION METALS FROM WOOD PULP FIBERS USING SUPERCRITICAL CARBON DIOXIDE |
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| Authors: | Kevin Thurbide Maher Al-Jabari Mathew Kowalchuk |
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| Affiliation: | a Department of Chemistry, University of Calgary, Calgary, Alberta, Canada.b Department of Chemical Engineering, An-Najah National University, Nablus, Palestine.c Pulp and Paper Research Center, McGill University, Montreal, Quebec, Canada. |
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| Abstract: | The supercritical fluid extraction of manganese and iron from solid matrix (wood pulp) is demonstrated experimentally. Supercritical carbon diodixe is used together with lithium bis(trifluoroethyl) dithiocarbonate (FDDC) as the ion-pairing reagent. The metal content of the pulp samples was determined by inductively couple plasma atomic emission spectroscopy (ICP-AES). Optimum conditions were determined to be 30 min each of static and dynamic extraction with 200 atm pressure at 40 °C. Thermomechanical pulp (TMP) extracted under these parameters exhibits an 80% decrease in manganese content, and 91% after a second, sequential extraction. The simultaneous removal of iron was found to be only 6% and supports evidence that it is much more strongly bound to the TMP matrix than manganese. |
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