Method for precipitating hemicellulose onto fibres for...

D - Textiles – Paper – 21 – C

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

D21C 3/26 (2006.01) D21C 3/02 (2006.01) D21C 3/24 (2006.01) D21C 9/00 (2006.01)

Patent

CA 2338363

A method for continuous cooking of lignocellulosic fibre material, comprising the steps of sequentially (a) in a first stage, impregnating the fibre material in an impregnation liquid comprising alkali metal hydroxide, and thereafter withdrawing (14, 514) a spent impregnation liquid; (b) in a second stage, cooking the fibre material in a cooking liquor comprising alkali metal hydroxide; and (c) in a third stage, adding (A), to said fibre material, a liquid which is rich in hemicellulose, said liquid preferably comprising at least a part (14a, 514a) of said withdrawn spent impregnation liquid. In a fourth stage (d), the fibre material is cooked in a cooking liquor comprising the liquid added in the third stage, whereby the fibre material is subjected to a retention time of at least 1 hour in said fourth stage.

L'invention concerne un procédé permettant de lessiver en continu un matériau à base de fibres de cellulose, qui comprend les étapes suivantes: (a) dans une première étape, on imprègne le matériau fibreux avec un liquide d'imprégnation renfermant un hydroxyde de métal alcalin, puis on retire (14, 514) le liquide d'imprégnation usé; (b) dans une deuxième étape, on lessive le matériau fibreux dans une lessive de cuisson renfermant un hydroxyde de métal alcalin; (c) dans une troisième étape, on ajoute (A) audit matériau fibreux un liquide riche en hémicellulose, contenant de préférence au moins une partie (14a, 514a) dudit liquide d'imprégnation usé retiré; et (d) dans une quatrième étape, on lessive le matériau fibreux dans une liqueur de lessivage contenant le liquide ajouté à la troisième étape, avec un temps de rétention d'au moins une heure.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method for precipitating hemicellulose onto fibres for... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for precipitating hemicellulose onto fibres for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for precipitating hemicellulose onto fibres for... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1418407

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.