Teknologian Tutkimuskeskus Vtt Oy

Andritz Oy

Metsa Fibre Oy

Tapio Vehmas

Tiina Liitiä

Anna Kalliola

Tarja Tamminen

Outi Poukka

Pauliina Sjögård

Lauri Pehu-Lehtonen

Katariina Kemppainen

Tiina Liitia

Tiina LiitiÄ

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

Tapio Vehmas