Use of a selected legume starch in an industrial fluid

Details Use of a selected legume starch in an industrial fluid Use of a selected legume starch in an industrial fluid

C - Chemistry, Metallurgy

08

B

C08B 31/00 (2006.01) C08B 30/12 (2006.01) C09K 8/035 (2006.01)

Patent

CA 2515387

The invention relates to the use of a selected legume starch with a Brookfield viscosity of between 100 and 20 000 mPa.s, as component of an industrial fluid. Said legume starch preferably also has an aqueous solubility of between 10 and 85 %. The industrial fluid is particularly a fluid for use in boreholes with a pH greater than 8.5 and which can be used at a temperature above 130 ·C. The invention further relates to a method for preparation of a legume starch, selected thus by the viscosity thereof and also several families of novel legume starches, characterised by particular ranges of viscosity and aqueous solubility.

La présente invention a pour objet l'utilisation d'un amidon de légumineuse sélectionné, à savoir présentant une viscosité Brookfield comprise entre 100 et 20 000 mPa.s, comme constituant d'un fluide industriel. De préférence, ledit amidon de légumineuse présente en outre une solubilité aqueuse comprise entre 10 et 85 %. Le fluide industriel consiste notamment en un fluide pour puits présentant un pH supérieur à 8,5 et exploitable à une température superieure à 130~C. L'invention concerne également un procédé de préparation d'un amidon de légumineuse ainsi sélectionné par sa viscosité. Elle vise enfin plusieurs familles de nouveaux amidons de légumineuses, caractérisés par des gammes particulières de viscosité et solubilité aqueuse.

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