Tuula Lehtimaa
Helsinki University of Technology
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Publication
Featured researches published by Tuula Lehtimaa.
Journal of Wood Chemistry and Technology | 2009
Ville Tarvo; Tuula Lehtimaa; Susanna Kuitunen; Ville Alopaeus; Tapani Vuorinen
Abstract Elementary kinetic modeling was used to study the mechanism of chlorate formation in chlorine dioxide delignification. Reaction conditions reflecting typical industrial processes (T = 50°C, pH 1.5–4) were examined. Fe mediated Cl(III) decomposition and a reaction between hypochlorous acid and chlorous acid (or their equilibrium counterparts) were found to be the major reaction routes responsible for chlorate formation at pH < 3. The latter route accounts for chlorate formation at pH ≥ 3. The rate of chlorous acid (HClO2) self-decomposition was too slow either to compete against the other routes (pH < 3) or to yield notable amounts of chlorate within the given time frame (pH ≥ 3). The results suggest that chlorate formation could be suppressed, without adverse effects on chlorine dioxide regeneration, by aiming for end pH 3–3.5, ensuring a moderate chloride ion concentration and by favoring concentrated solutions/suspensions.
Archive | 2007
Tapani Vuorinen; Immanuel Adorjan; Anna Stiina Jääskeläinen; Tuula Lehtimaa; Katri Toikka; Zhen Zhou
59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings | 2005
Susanna Kuitunen; Ville Travo; Tuula Lehtimaa; Juhani Aittamaa
Archive | 2009
Tuula Lehtimaa; Ville Tarvo; Susanna Kuitunen; Christian Järnefelt; Tapani Vuorinen
Archive | 2008
Tuula Lehtimaa; Christian Järnefelt; Tapani Vuorinen
Archive | 2012
Naveen Kumar Chenna; Anna-Stiina Jääskeläinen; Tuula Lehtimaa; Susanna Kuitunen; Tapani Vuorinen
Archive | 2010
Susanna Kuitunen; Anna Kalliola; Ville Tarvo; Tarja Tamminen; Stella Rovio; Tiina Liitiä; Taina Ohra-aho; Tuula Lehtimaa; Tapani Vuorinen; Ville Alopaeus
Archive | 2008
Sirje Liukko; Tuula Lehtimaa; Tapani Vuorinen
Archive | 2008
Sirje Liukko; Tuula Lehtimaa; Tapani Vuorinen
Archive | 2008
Sirje Liukko; Tiina Liitiä; Tuula Lehtimaa; Tapani Vuorinen