A METHOD FOR TREATING LIGNIN AND FOR PRODUCING A BINDER COMPOSITION

• Main Authors: Ringena Okko, Pietarinen Suvi, Valkonen Sanna
• Format: Patent
• Language: English; Slovenian
• Published: 30.11.2023
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOUNDS OF UNKNOWN CONSTITUTION; DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS; DYES; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUTORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTINGOF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL; MANUFACTURE OF SPECIFIC WOODEN ARTICLES; METALLURGY; MINERAL OR SLAG WOOL; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NAILING OR STAPLING MACHINES IN GENERAL; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PERFORMING OPERATIONS; POLISHES; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF MATERIALS AS ADHESIVES; WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL

The present invention relates to a method for treating lignin, wherein the method comprises the following steps: a) dissolving lignin into an aqueous composition, which contains a compound selected from the class of phenols and alkali, while keeping the temperature of the composition at 40 - 85 °C, wherein the alkali comprises a hydroxide of an alkali metal; and b) heating the composition at a temperature, which is higher than the temperature of the composition in step a), with the proviso that the temperature of the composition does not exceed 100 °C, while keeping the pH of the composition at a pH value of 6 - 14.