Process for the production of acetic acid

Details Process for the production of acetic acid Process for the production of acetic acid

C - Chemistry, Metallurgy

07

C

C07C 51/44 (2006.01) C07C 51/48 (2006.01) C07C 53/08 (2006.01) C07C 51/12 (2006.01)

Patent

CA 2605494

A process for the reduction and/or removal of permanganate reducing compounds formed by the carbonylation of methanol in the presence of a Group VIII metal carbonylation catalyst to produce acetic acid is disclosed. More specifically, a process for reducing and/or removing permanganate reducing compounds or their precursors from intermediate streams during the formation of acetic acid by said carbonylation processes is disclosed. In particular, a process in which a low boiling overhead vapor stream from a light ends column is subjected to a single distillation to obtain an overhead that is subjected to an extraction to selectively remove and/or reduce PRCs from the process is disclosed.

L'invention concerne un procédé de réduction et/ou d'élimination de composés réducteurs de permanganate formés par carbonylation de méthanol en présence d'un catalyseur de carbonylation de métal de groupe VIII afin de produire de l'acide acétique. Plus particulièrement, l'invention concerne un procédé destiné à réduire et/ou à éliminer les composés de réduction de permanganate ou leurs précurseurs de courant intermédiaire durant la formation d'acide acétique au moyen des procédés de carbonylation décrits. Plus particulièrement, un procédé dans lequel un courant de vapeur aérien à faible ébullition provenant d'une colonne de fractions légères est soumis à une distillation unique afin d'obtenir une surcharge soumise à une extraction afin d'éliminer et/ou de réduire sélectivement les PRC du procédé.

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