Method for separating the main components of lignocellulosic...

D - Textiles – Paper – 21 – C

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D21C 3/02 (2006.01) D21B 1/02 (2006.01) D21C 5/00 (2006.01)

Patent

CA 2603645

The objective of this invention is a method for separating cellulosic fibres, hemicellulose and lignin from parts of plants containing these, such as stems, leaves and seed coats or hulls of cereal, oilseed, fibre or grassy plants. After appropriate pre-treatments the material is heated in an alkaline solution at lower temperatures than used in the traditional cellulose manufacturing. After this heat treatment, the fibrous and other undissolved materials are separated from the solution and subsequently ground in wet condition, using preferably chafing treatments. For improving the separation, surface active substances can be included in the alkaline heat treatment solution.

L'invention concerne une méthode pour séparer des fibres cellulosiques, de l'hémicellulose et de la lignine à partir de parties de végétaux contenant ces matières, notamment des tiges, des feuilles, des enveloppes de graine ou de la balle de céréale, des graines oléagineuses, des végétaux fibreux ou des graminées. Après des prétraitements appropriés, ces matières sont chauffées dans une solution alcaline, à des températures inférieures à celles utilisées dans une fabrication de cellulose classique. Après ce traitement thermique, les matières fibreuses ou d'autres matières non dissoutes sont séparées de la solution et subséquemment moulues dans des conditions humides, de préférence par des traitements de frottements. Pour améliorer la séparation, des substances actives de surface peuvent être ajoutées dans la solution de traitement thermique alcaline.

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