Method for producing fibrous material made of wood

Details Method for producing fibrous material made of wood Method for producing fibrous material made of wood

D - Textiles, Paper

21

C

D21C 3/00 (2006.01) D21B 1/00 (2006.01) D21C 3/06 (2006.01) D21C 3/18 (2006.01) D21C 9/00 (2006.01) D21H 11/06 (2006.01)

Patent

CA 2634380

The invention relates to a process for producing fibrous material, comprising the steps - preparation of a solution of chemicals comprising less than 25% of sulphite (calculated as Na2SO3), based on the oven-dry amount of the lignocellulosic raw material, - mixing of the solution of chemicals with wood in a specified liquor ratio, - heating of the solution of chemicals and of the wood to a temperature above room temperature and then - either (1st alternative) removal of free-flowing solution of chemicals and digestion of the wood in the vapour phase - or (2nd alternative) digestion of the wood in the liquid phase and - separation of the free-flowing solution of chemicals and of the wood.

L'invention concerne un procédé de préparation de matières fibreuses avec les étapes de préparation d'une solution de composé chimique avec moins de 25 % de sulfite (calculé comme Na- SO<SUB>3</SUB>) sur base de la quantité desséchée à l'étuve de la matière première lignocellulosique, mélange de la solution de composé chimique avec le bois en un rapport de bain prédéterminé, chauffage de la solution de composé chimique et du bois jusqu'à une température supérieure à la température ambiante et ensuite, soit (alternative 1) élimination de la solution de composé chimique s'écoulant librement et pulpage du bois en phase vapeur, soit (alternative 2) pulpage du bois en phase liquide et séparation de la solution de composé chimique s'écoulant librement, et du bois.

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