Process for producing pulp from lignocellulosic plants, and...

D - Textiles – Paper – 21 – B

Patent

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Details

D21B 1/36 (2006.01) D21B 1/00 (2006.01) D21B 1/02 (2006.01) D21C 1/06 (2006.01) D21C 5/00 (2006.01)

Patent

CA 2242232

The invention relates to a process for producing pulp, from raw lignocellulosic material based on annual or perennial plants, or residues of such plants. The process comprises impregnating said raw material with an aqueous soda solution such that the weight proportion of soda is substantially comprises between 3.5 % and 10 % based on the dry material and that the weight ratio of hydration of the cellulosic material after impregnation is at least equal to 40 %, and subjecting the lignocellulosic material thus impregnated to vapocracking which consists in pressurising said material under saturated vapour conditions and producing a sudden expansion through a direct passage valve. The solid fraction which forms the pulp is then separated from the aqueous phase and the hydrosoluble products. The process yields good quality pulps characterized particularly by a braking length higher than 5500 meters, and having a high lignine ratio (KAPPA index comprises between 60 and 65).

L'invention concerne un procédé de fabrication de pâte à papier, à partir d'une matière première lignocellulosique à base de plantes annuelles ou pérennes, ou de résidus de ces plantes. Ce procédé consiste à imprégner ladite matière première au moyen d'une solution aqueuse de soude de façon que la proportion pondérale de soude soit sensiblement comprise entre 3,5 % et 10 % rapportée à la matière sèche et que le taux pondéral d'hydratation de la matière cellulosique après imprégnation soit au moins égal à 40 %, puis à soumettre la matière lignocellulosique ainsi imprégnée à une opération de vapocraquage consistant à mettre en pression celle-ci sous vapeur saturée et à produire une détente brutale à travers une vanne à passage direct. La fraction solide qui constitue la pâte à papier est ensuite séparée de la phase aqueuse et des produits hydrosolubles. Le procédé conduit à des pâtes à papier de bonne qualité bénéficiant en particulier de longueur de rupture supérieure à 5,500 mètres, et possédant un taux de lignine élevé (indice KAPPA compris entre 60 et 65).

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