Recovery of phytosterols from residual vegetable oil streams

C - Chemistry – Metallurgy – 07 – J

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C07J 75/00 (2006.01) C07J 9/00 (2006.01) C11B 13/00 (2006.01)

Patent

CA 2717956

There is disclosed a method for isolation and purification of phytosterols from tall oil pitch comprising the steps of: a) contacting the tall oil pitch with a solvent to form a tall oil solvent mixture; b) separating the tall oil pitch solvent mixture in at least two separate streams wherein one process stream is enriched in acidic pitch components and a second stream enriched in free- and bound sterols in the form of steryl esters; c) subjecting the stream enriched in free- and steryl esters to treatment with an alcohol under transesteri- fication conditions wherein a reaction mixture is formed and sterols comprising the steryl esters are lib-erated as free sterols; and d) separating the free sterols from the reaction mixture of step c) by crystallization and extraction with one or more solvents. There are disclosed free fatty acids and resin acids separated from the tall oil pitch. Moreover, there is dis-closed a manufacture and separation of fatty acid alkyl esters by the method.

La présente invention concerne un procédé disolement et de purification de phytostérols de brai de tallöl, qui comprend les étapes consistant à : a) mettre en contact le brai de tallöl avec un solvant pour former un mélange de solvant et de tallöl ; b) séparer le mélange de solvant et de brai de tallöl en au moins deux courants séparés, un courant de traitement étant enrichi en composants de brai acides et un deuxième courant enrichi en stérols libres et liés sous la forme desters de stéryle ; c) soumettre le courant enrichi en ester libres et de stéryle à un traitement avec un alcool dans des conditions de transestérification, un mélange réactionnel étant formé et des stérols comprenant les esters de stéryle étant libérés sous la forme de stérols libres ; et d) séparer les stérols libres du mélange réactionnel de létape c) par cristallisation et extraction avec un ou plusieurs solvants. Linvention concerne également les acides gras libres et les acides de résine séparés du brai de tallöl. Linvention concerne en outre une fabrication et une séparation dalkyl esters dacides gras par le procédé.

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