A method for dissolving cellulose and a cellulosic product...

C - Chemistry – Metallurgy – 08 – B

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C08B 1/00 (2006.01) D01F 2/02 (2006.01)

Patent

CA 2723573

The present invention relates to a method for dissolving cellulose. The method comprises -introducing cellulosic raw material, -treating the cellulosic raw ma-terial in an enzymatic treatment process, -mixing the cellu-losic raw material after the enzymatic treatment in an aque-ous solution in order to obtain an aqueous intermediate product containing the cellulosic raw material of at least 3.5 wt.-%, alkali metal hydroxide between 3.5 wt.-% and 7 wt.-% and zinc salt, -freezing the intermediate product to a solid state, and -melting the frozen intermediate product. The present invention also relates to a cellulosic product obtained from a solution comprising dissolved cellulose.

La présente invention concerne un procédé pour dissoudre la cellulose. Le procédé consiste -à introduire une matière première cellulosique, -à traiter la matière première cellulosique dans un processus de traitement enzymatique, -à mélanger la matière première cellulosique après le traitement enzymatique dans une solution aqueuse afin dobtenir un produit intermédiaire aqueux contenant au moins 3,5 % en poids de la matière première cellulosique, entre 3,5 % en poids et 7 % en poids dhydroxyde de métal alcali et du sel de zinc, -à geler le produit intermédiaire à un état solide, et à faire fondre le produit intermédiaire gelé. La présente invention concerne également un produit cellulosique obtenu à partir dune solution contenant de la cellulose dissoute.

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