Wcce08 Pasi Tolvanen Final

08/22/09 ENVIRONMENTALLY FRIENDLY CATALYTIC STARCH OXIDATION BY HYDROGEN PEROXIDE 8th World Congress of Chemical Engineering, Montreal, August 23 to 27, 2009 P. Tolvanen , P. Mäki-Arvela, A. B. Sorokin, T. Salmi, D. Yu. Murzin, Åbo Akademi Process Chemistry Centre Turku, Finland Collaboration with Institut de Recherches sur la Catalyse-CNRS, Villeurbanne Cedex, France

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What is starch and its applications? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(C 6 H 10 O 5 ) n ENVIRONMENTALLY FRIENDLY CATALYTIC STARCH OXIDATION BY HYDROGEN PEROXIDE

[object Object],[object Object],[object Object],[object Object],[object Object],Carboxyle Carbonyle Traditional oxidation methods use: - heavy metals (Fe, Cu, W) as catalysts - NaOCl, N 2 O 4 as oxidants ---> large amounts of inorganic waste In our work: Green Chemistry - iron tetrasulfonatophthalocyanine (FePcS) as catalyst - hydrogen peroxide as oxidant ENVIRONMENTALLY FRIENDLY CATALYTIC STARCH OXIDATION BY HYDROGEN PEROXIDE

Reactor setup -1000 ml glass reactor - pH-stat to control pH (2M NaOH) - H 2 O 2 feed 22 ml/h or initially 0.7 w-% in batch mode Parameters - pH = 7-10 - T = 52 degrees celsius - conc. of FePcS catalyst 0.014 mmol/L Typically 260g potato starch added to 800ml deionized water ENVIRONMENTALLY FRIENDLY CATALYTIC STARCH OXIDATION BY HYDROGEN PEROXIDE

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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[2] R.J. Smith, Starch: Chemistry and technology, 2 (1967) 620-625 ENVIRONMENTALLY FRIENDLY CATALYTIC STARCH OXIDATION BY HYDROGEN PEROXIDE

In our previous study [1] : Semibatch by feeding H 2 O 2 constantly to reactor Slightly alkaline environment.: pH 7-10 H 2 O 2 constant feed at 22 ml/h (30%) catalyst (FePcS) added initially reaction time 7h --> high pH gave good degree of substitution but not good yield [1] Tolvanen et al. Chem . Eng. J. (2009) ENVIRONMENTALLY FRIENDLY CATALYTIC STARCH OXIDATION BY HYDROGEN PEROXIDE

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[object Object],Native potato starch BET: 10 m 2 /g Native potato starch treated with ultrasound 24 h at 38 deg. celsius BET: 18m 2 /g Ultrasound treated starch after reaction in pH = 8.4 ENVIRONMENTALLY FRIENDLY CATALYTIC STARCH OXIDATION BY HYDROGEN PEROXIDE

[object Object],[object Object],[object Object],30 % higher yield ENVIRONMENTALLY FRIENDLY CATALYTIC STARCH OXIDATION BY HYDROGEN PEROXIDE

[object Object],[object Object],[object Object],50 % higher yield ENVIRONMENTALLY FRIENDLY CATALYTIC STARCH OXIDATION BY HYDROGEN PEROXIDE

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[object Object],[object Object],Department of Industrial Chemistry and reaction Engineering Åbo Akademi Univesity Turku/Åbo Suomi/Finland

Wcce08 Pasi Tolvanen Final

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