Andritz Oy

Teknologian Tutkimuskeskus Vtt Oy

Metsa Fibre Oy

Outi Poukka

Tiina Liitiä

Pauliina Sjögård

Lauri Pehu-Lehtonen

Tarja Tamminen

Taina Ohra-Aho

Anna Kalliola

Tapio Vehmas

Sanna Hämäläinen

Pekka Kittilä

Katja Salmenkivi

Katariina Kemppainen

According to an example aspect of the present invention, there is provided a method of removing volatile compounds from a lignin-containing material, the method comprising: providing a material comprising lignin and volatile compounds; treating the material by a distillation method in order to vaporize at least a part of the volatile compounds.

Method of removing volatile compounds from a lignin-containing material, use of a distillation method, and a lignin-containing material

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

A method of regenerating an activated carbon catalyst which is used in the production of polysulphide liquor. In the method, the catalyst is washed with a washing liquid in order to remove the sediment accumulated in the catalyst. According to the present invention, in this case, the activated carbon catalyst is regenerated most suitably by bringing it to a multi-stage washing which comprises at least one washing step in which the washing liquid used comprises sodium sulphide, and one washing step in which acidic washing liquid is used. The sulphur precipitate is peeled off using sodium sulphide, and the iron and other metals can be effectively removed by using an acidic washing, without damaging the catalyst.

Method for regenerating catalysts used for production of polysulphide cooking liquors

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