Method for delignifying lignocellulosic materials

D - Textiles – Paper – 21 – C

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D21C 3/06 (2006.01)

Patent

CA 2452611

The invention relates to a method for delignifying lignocellulosic raw materials by using sulfites in the presence of an alkaline component, especially sodium hydroxide or sodium carbonate or a mixture thereof in an aqueous solution at a high temperature and high pressure. The invention is characterized in that a first partial fragment of the alkaline component is added when the aqueous solution starts to decompose and in that at least a second partial fragment of the alkaline component is added only when delignification begins.

L'invention concerne un procédé de délignification de matières premières lignocellulosiques, par l'utilisation de sulfites en présence d'un constituant alcalin, en particulier de l'hydroxyde de sodium ou du carbonate de sodium ou encore un mélange de ces derniers, dans une solution aqueuse à une température et une pression accrues. Ce procédé se caractérise en ce qu'une première partie du constituant alcalin est ajoutée au début d'une dissolution et au moins une deuxième partie du constituant alcalin est ajoutée à la solution aqueuse au plut tôt, au début de la délignification.

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