31.5.2019 In research, optimisation of general process parameters under mill-scale bleaching was obtained (Isoaho)

In his dissertation at University of Jyväskylä, Jukka Pekka Isoaho studied the effect of reductive bleaching of thermomechanical pulp. The main objective was to find out relevant factors affecting the achievable brightness gain. The second purpose was to investigate the basic chemical behaviour of dithionite, starting from the preparation of bleaching solution and ending to pulp bleaching. As an experimental result, optimisation of general process parameters under mill-scale bleaching was obtained.
Published
31.5.2019

Understanding the reactions of the sulphur compounds and evaluating the efficiency of bleaching is valuable information for paper manufacturers. The industrial process has often lacked knowledge of basic chemistry and reactions occurring during the bleaching process.

This new information on reactions of dithionite decomposition has further developed the postulated mechanism of lignin-preserving bleaching. Although the gained results are largely based on laboratory-scale experiments, they also give ideas to control mill-scale dithionite bleaching. Novel analytical methods to determine sulphur-containing anions originated from dithionite were developed.

A research is published in JYU Dissertation -series, Ä¢¹½Ö±²¥ 2019. ISSN 2489-9003; 85; ISBN 978-951-39-7768-9(PDF),  ISBN 978-951-39-7768-9 (PDF).

Link to publication : 

M.Sc Jukka Pekka Isoaho defends his doctoral dissertation in chemisty  " Dithionite Bleaching of Thermomechanical Pulp — Chemistry and Optimal Conditions" 31st of May 2019 at 12:00 in Seminarium, S212. The Opponent is  professor Jouni Paltakari (Aalto University) and Custos professor Raimo Alén (Jyväskylän yliopisto).  The doctoral dissertation is held in Finnish.

Jukka Pekka Isoaho graduated from the Department of Chemistry at the Ä¢¹½Ö±²¥ in 1993. Currently, Isoaho is working as a laboratory engineer.

For more information:

Jukka Pekka Isoaho, jukka.p.isoaho@jyu.fi, +358 40 8053689

Communications Officer Tanja Heikkinen, viestinta@jyu.fi, +358 50 581 8351

Faculty of Mathematics and Science