Extraction of valuable components from bark

Klaus Niemelä (Inventor), Tarja Tamminen (Inventor), Stina Grönqvist (Inventor), Miikka Ruuskanen (Inventor), Sami Alakurtti (Inventor)

Research output: PatentPatent


The present invention relates to a process for the extraction of valuable components from a tannin-rich bark raw-material, by carrying out an alkaline cooking step, followed by acid precipitation to separate the valuable components from the remaining bark pulp. The invention also relates to the use of said process on a bark side stream of a chemical pulping plant, whereby the liquor remaining after the extraction of the present process is returned to a stream of the wood pulping process, typically to a black liquor stream, while the spent pulp can be processed further, e.g. by bleaching to give dissolved pulp.

Patent family as of 27.1.2022
AU2019368701 AA 20210520 AU20190368701 20191023      
BR112021007706 A2 20210727 BR20211107706 20191023      
CA3116963 AA 20210419 CA20193116963 20191023      
CL2021001038 A1 20211126 CL20210001038 20210422      
CN113195729 A 20210730 CN201980070458 20191023      
EP3870713 A1 20210901 EP20190797770 20191023      
FI129347 B 20211215 FI20180005891 20181023      
FI20185891 A 20200424 FI20180005891 20181023      
ID2021PID08832 A 20211108 ID2021P0003643 20191023      
JP2022505620 T2 20220114 JP20210522024T 20191023      
US2021395466 AA 20211223 US20210287145 20191023      
WO20084196 A1 20200430 WO2019FI50756 20191023

Link to currentpatent family on right 

Original languageEnglish
Patent numberFI129347B
IPCD21C 11/ 00 A I
Priority date23/10/18
Publication statusPublished - 15 Dec 2021
MoE publication typeH1 Granted patent


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