Purification of acetic acid from wood acetylation process

Details Purification of acetic acid from wood acetylation process Purification of acetic acid from wood acetylation process

C - Chemistry, Metallurgy

07

C

C07C 51/46 (2006.01) B27K 3/02 (2006.01) B27K 3/36 (2006.01) C07C 53/08 (2006.01)

Patent

CA 2714953

A method of purifying acetic acid containing terpene and terpenoid impurities, includes: (a) supplying acetic acid containing terpene or terpenoid impurities and water to a distillation column; (b) azeotropically removing terpene or terpenoid impurities from the mixture of acetic acid and water supplied to the column as distillate; and (c) withdrawing a product stream from the column comprising acetic acid purified of terpene or terpenoid impurities. The method is particularly effective for purifying acetic acid recovered from a wood purification process.

Le procédé ci-décrit de purification d'un acide acétique contenant des impuretés du type terpène et terpénoïdes comprend : (a) l'application de l'acide acétique contenant des impuretés du type terpène ou terpénoïdes et d'eau à une colonne de distillation; (b) l'élimination azéotrope des impuretés du type terpène ou terpénoïdes du mélange d'acide acétique et d'eau appliqué à la colonne sous la forme d'un distillat; (c) le soutirage d'un flux en produit provenant de la colonne comprenant l'acide acétique débarrassé des impuretés du type terpène ou terpénoïdes. Le procédé est particulièrement efficace pour purifier l'acide acétique récupéré à partir d'un procédé d'acétylation du bois.

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