Neste Chemicals Oy

Valtion Teknillinen Tutkimuskeskus

Marja-Leena Niku-Paavola

Liisa Viikari

Raija Lantto

Pia Qvintus-Leino

Johanna Buchert

Anneli Hase

Lars G&auml;dda

Simo Tuominen

Christa Schönberg

The invention relates to an intermediate product for the preparation of polymerizates from lignin derivatives obtained from the cellulose industry. The intermediate product is produced by treating the lignin derivatives with enzymes capable of oxidizing phenol in the presence of oxidizing agents. According to the invention the lignin derivatives are subjected to the enzymatic treatment for more than 3 hours in the presence of air, or they are subjected to an enzymatic treatment for more than 10 min, whereby air or oxygen is introduced. The lignin polymers obtained from the polymerization of lignin derivatives performed in the presence of active intermediate products are suited for use in the production of binding agents for wood materials.

Intermediate product for preparation of lignin polymers and use thereof for production of wood materials

A process for manufacturing fiber boards and similar wood-based products from a lignocellulosic raw material having a moisture content of at least 10 wt-%. According to the process, an aqueous fraction is separated from the fibers of the raw material, which fraction later is recycled to the process in order to form at least a part of the agent used for binding the fibers. Before mixing with the fibers, the aqueous effluent is concentrated and enzymatically oxidized in the presence of oxygen in order to polymerize the solubilized wood material and in order to increase its concentration. Lignin can be added to the water solubilized wood material or the solubilized wood material can be added to the fibers together with another binder. Eventually, the mixture is formed into a board and hardened.

Process for preparing fiber boards

Growing community of inventors

Espoo, Finland

Marja-Leena Niku-Paavola