Pre-extraction and solvent pulping of lignocellulosic material

Details Pre-extraction and solvent pulping of lignocellulosic material Pre-extraction and solvent pulping of lignocellulosic material

C - Chemistry, Metallurgy

08

B

C08B 37/14 (2006.01)

Patent

CA 2710837

A process of treating a lignocellulosic material includes a pre-extraction step in which hemicellulose is extracted from the lignocellulosic material. Then, in a solvent pulping step, the lignocellulosic material is separated into pulp by contacting the lignocellulosic material with a cooking liquor comprising a solvent. In one embodiment, the solvent has a boiling point of at least about 150°C. In another embodiment, the cooking liquor comprises a mixture of solvent and water.

Cette invention concerne le traitement d'un matériau lignocellulosique comprenant une étape de pré-extraction où l'hémicellulose est extraite du matériau lignocellulosique. Puis, dans une étape de mise en pâte par solvant, le matériau cellulosique est soumis à séparation pour obtenir une pâte par contact du matériau lignocellulosique avec une lessive de cuisson comprenant un solvant. Dans un mode de réalisation, le solvant a un point d'ébullition d'au moins environ 150 °C. Dans un autre mode de réalisation, la lessive de cuisson comprend un mélange de solvant et d'eau.

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