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Dive into the research topics where Jukka Jäkärä is active.

Publication


Featured researches published by Jukka Jäkärä.


Holzforschung | 2005

Mechanism of decomposition of peracetic acid by manganese ions and diethylenetriaminepentaacetic acid (DTPA)

Evgeny Popov; Jussi Eloranta; Vesa Hietapelto; Veli-Matti Vuorenpalo; Reijo Aksela; Jukka Jäkärä

Abstract The decomposition mechanism of peracetic acid by free Mn2+ ions and by Mn2+-diethylenetriaminepentaacetic acid complexes was studied by UV/Vis, electrospray ionization-time of flight-mass spectrometry (ESI-TOF-MS), electron spin resonance (ESR), and Raman spectroscopy. The experimental results demonstrate that a number of different oxidation states of manganese are involved in the decomposition reaction. Furthermore, the kinetics observed show oscillatory features that are characteristic of autocatalytic processes. Radical pathways were found to play a negligible role in the reaction. Based on the experimental observations, an overall reaction scheme for the decomposition process is proposed.


Archive | 2005

Process for deinking waste paper

Bob Horacek; Jukka Jäkärä; Mikael Svedman


Archive | 1998

Bleaching of chemical pulp with peracid

Jukka Jäkärä; Juha Patola; Aarto Paren


Archive | 1995

Delignification of chemical pulp with peroxide in the presence of a transition metal

Aarto Paren; Jukka Jäkärä; Juha Patola


Appita Journal | 2006

Studies on Three New Environmentally Friendly Chelating Ligands

Helena Hyvönen; Marjatta Orama; Riina Arvelac; Katariina Henriksson; Heikki Saarinen; Reijo Aksela; Aarto Parene; Jukka Jäkärä; Ilkka Renvall


Archive | 1995

Delignification of chemical pulp with peroxide in the presence of a silicomolybdenic acid compound

Aarto Paren; Jukka Jäkärä; Juha Patola


Archive | 1997

Process for the peracid bleaching of chelated chemical pulp

Jukka Jäkärä; Aarto Paren; Reijo Aksela; Ilkka Renvall


Archive | 2008

New Composition and Process for the Treatment of Fibre Material

Aarto Paren; Jonni Ahlgren; Jukka Jäkärä; Ilkka Renvall; Jukka Rautiainen


Archive | 1998

Bleaching of chemical pulp and treatment with a chelating agent

Reijo Aksela; Jukka Jäkärä; Aarto Paren; Ilkka Renvall


Japan Tappi Journal | 1998

Peracetic Acid in Low AOX and High Brightness Pulp Production

Jukka Jäkärä; Aarto Paren; Ilkka Renvall; Reijo Aksela

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