C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/12 (2006.01) B01D 3/00 (2006.01) C07C 53/08 (2006.01)
Patent
CA 2699762
An improved method of producing acetic acid includes condensing overhead vapor from a light ends column and decanting the condensed vapor to a light phase and a heavy phase. The heavy phase consists predominantly of methyl iodide and at least a portion of the decanted heavy phase is refluxed to the light ends column. Acetic acid content of the light ends column overhead stream and water content of the light ends column product (sidedravv) stream are both decreased, improving purification efficiency.
L'invention porte sur un procédé perfectionné de fabrication d'acide acétique, qui comprend la condensation d'une vapeur de distillat de tête provenant d'une colonne de fractions légères et la décantation de la vapeur condensée en une phase légère et une phase lourde. La phase lourde se compose de façon prédominante d'iodure de méthyle et au moins une partie de la phase lourde décantée est portée au reflux dans la colonne de fractions légères. La teneur en acide acétique du courant de distillat de tête de la colonne de fractions légères et la teneur en eau du courant de produit de colonne de fractions légères (courant latéral) sont toutes deux diminuées, améliorant le rendement de purification.
Celanese International Corporation
Smart & Biggar
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