Process for the preparation of a modified polysaccharide and...

C - Chemistry – Metallurgy – 08 – B

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31/26, 260/225.1

C08B 37/00 (2006.01) C09K 8/90 (2006.01) E21B 43/22 (2006.01)

Patent

CA 1265791

PRECIS DE LA DIVULGATION L'invention concerne un procédé de préparation d'un polysaccharide modifie ainsi que des compositions le conte- nant. Selon ce procédé, des compositions aqueuses contenant un polysaccharide tel que la gomme Xanthane sont acidifiées par l'acide nitrique puis traitées à la chaleur. On obtient ainsi des polysaccharides modifiés dont les compositions aqueuses ont une filtrabilité améliorée. Ces polysaccharides modifiés sont notamment utilisables comme additif viscosifi- ant dans les industries requérant des produits clarifiés, notamment pour la récupération assistée du pétrole.

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