C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
C08B 37/00 (2006.01) C02F 5/10 (2006.01) C09K 8/528 (2006.01) C09K 8/54 (2006.01) C08L 5/00 (2006.01)
Patent
CA 2685832
A depolymerized-carboxyalkyl polysaccharide formed by de polymerizing a polysaccharide having from 0.5 to 3.0 degrees of substitution and reducing the molecular weight of said polysaccharide before or after said depolymerizing provides a biodegradable scale inhibitor useful to prevent deposition of scale comprising, for example, calcium, barium, sulfate and salts thereof. The depolymerized carboxyalkyl polysaccharide is particularly useful in off shore oil production squeeze treatments and in the treatment of scale formed in industrial water treatment.
La présente invention concerne un polysaccharide carboxyalkyl dépolymérisé formé par dépolymérisation d'un polysaccharide présentant entre 0,5 et 3,0 degrés de substitution. On obtient en réduisant le poids moléculaire dudit polysaccharide, avant ou après ladite dépolymérisation, un anti-incrustant biodégradable utile pour prévenir la formation de dépôts, et notamment de calcium, de baryum, de sulfate et des sels qui les composent. Le polysaccharide carboxyalkyl dépolymérisé est particulièrement efficace dans les traitements par esquiche employés dans la production pétrolière offshore ainsi que pour les dépôts formés dans le traitement des eaux industrielles.
Decampo Floryan
Kesavan Subramanian
Woodward Gary
Gowling Lafleur Henderson Llp
Rhodia Inc.
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