Process to improve alkyl ester sulfonate surfactant...

C - Chemistry – Metallurgy – 07 – C

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C07C 309/17 (2006.01) C07C 303/44 (2006.01) C11D 1/28 (2006.01)

Patent

CA 2155541

A process for improving the color and purity of dark-colored potassium or magnesium alkyl ester sulfonate surfactant compositions, and particularly alpha-sulfo fatty acid methyl ester compositions, without the need for bleaching or other process steps. The process comprises the steps of (1) forming a mixture comprising (i) an alkyl ester sulfonate surfactant composition containing impurities including dark-colored impurities organic and inorganic salts, and disalts, and (ii) water, and (2) separating the ester sulfonate surfactant from the mixture. The process may further comprise step (3) recovering the alkyl ester sulfonate surfactant. Methyl ester sulfonate surfactant compositions are most preferred. After processing in accordance with the invention, the alkyl ester sulfonate surfactant composition has improved color, purity, and odor properties.

Procédé pour améliorer la couleur et le degré de pureté des compositions tensio-actives à base de sulfonate d'alkylester de potassium ou de magnésium de couleur sombre, et plus particulièrement des compositions de méthylester d'acides gras alpha-sulfo, sans qu'il soit nécessaire de procéder à une opération de blanchiment ou autre. Le procédé comprend les étapes suivantes: 1) faire un mélange comprenant i) une composition tensio-active à base de sulfonate d'alkylester contenant des impuretés, y compris des impuretés de couleur sombre, des sels organiques et inorganiques et des bisels et ii) de l'eau, et 2) isoler du mélange l'agent tensio-actif à base de sulfonate d'ester. Les compositions tensio-actives préférées sont celles à base de sulfonate de méthylester. Après traitement conformément à l'invention, la composition tensio-active à base de sulfonate d'alkylester présente des caractéristiques de couleur, de pureté et d'odeur améliorées.

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