Removal of permanganate reducing compounds from methanol...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/44 (2006.01) C07C 51/48 (2006.01) C07C 53/08 (2006.01)

Patent

CA 2556998

An improvement of the methanol carbonylation process for manufacturing acetic acid is disclosed. Specifically disclosed is a method for reducing the formation of alkyl iodides and C3-8 carboxylic acids by removing permanganate reducing compounds ("PRC's") from the light phase of the condensed light ends overhead stream, including (a) distilling the light phase to yield a PRC enriched overhead stream; and (b) extracting the third overhead stream with water in at least two consecutive stages and separating therefrom one or more aqueous streams containing PRC's.

Perfectionnement apporté à un processus de carbonylation de méthanol pour la fabrication de l'acide acétique. Il s'agit plus précisément d'un procédé de réduction de la formation d'iodures d'alkyle et d'acides carboxyliques en C¿3-8? par élimination des composés réducteurs de permanganate, appelés PRC, dans la phase légère du débit de tête de fractions légères condensées, lequel procédé consiste (a) à distiller la phase légère afin d'obtenir un débit de tête enrichi en PRC ; et (b) à extraire le troisième débit de tête avec de l'eau en au moins deux étapes consécutives et à en séparer un ou plusieurs débits aqueux renfermant les PRC.

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