Teknologian Tutkimuskeskus Vtt Oy

Andritz Oy

Metsa Fibre Oy

Anna Kalliola

Tiina Liitiä

Tarja Tamminen

Tapio Vehmas

Outi Poukka

Pauliina Sjögård

Lauri Pehu-Lehtonen

Katariina Kemppainen

Stina Grönqvist

Sami Alakurtti

Miikka Ruuskanen

Klaus Niemelä

Tiina Liitia

Tiina LiitiÄ

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.

Extraction of valuable components from bark

According to an example aspect of the present invention, there is provided a method for producing an oxidised lignin based high performance surface active agent in techno-economically feasible manner within kraft pulp mill without interfering the main process.

Method for producing oxidized lignin in kraft pulp mill

The present invention concerns a process for oxidizing lignin at alkaline conditions. This oxidized lignin can be used as a dispersant in various end-products, for example as a renewable plasticizer in cement-containing products, such as concrete, where the ability of the oxidized lignin to endure alkaline conditions is an advantage. Further, the invention concerns a concrete mixture containing aggregate, cement, water and a plasticizer formed of oxidized lignin, and a process for producing such a concrete mixture. The oxidized lignin can be manufactured using a process, where the lignin starting material is reacted with an oxidizing agent in solution in alkaline conditions.

Use of oxidized lignin as a dispersant

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Espoo, Finland

Anna Kalliola