C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/14 (2006.01) C07C 57/03 (2006.01)
Patent
CA 2433300
The invention concerns a method for preparing beta, gamma saturated or unsaturated carboxylic acids. More particularly, the invention concerns hydroxycarbonylation of an organic compound comprising a conjugated unsaturation, such as butadiene, through the action of carbon monoxide and water in the presence of a palladium catalyst. The resulting carboxylic acids are preferably pentenoic acids. The invention is characterised in that the reaction medium at the end of the hydroxycarbonylation step is treated with hydrogen to reduce the palladium present in palladium 2 + oxidation state to zero oxidation state and to recover the precipitated palladium.
La pr~sente invention concerne un proc~d~ de pr~paration d'acides carboxyliques b~ta, gamma insatur~s ou satur~s.Elle concerne plus particuli~rement l'hydroxycarbonylation d'un compos~ organique comprenant une insaturation conjugu~e, comme le butadi~ne, par action de monoxyde de carbone et d'eau en pr~sence d'un catalyseur ~ base de palladium. Les acides carboxyliques ainsi obtenus sont de pr~f~rence, les acides pent~no~ques. Selon l'invention, le milieu r~actionnel apr~s la fin de l'~tape d'hydroxycarbonylation est trait~ par l'hydrog~ne pour r~duire le palladium pr~sent ~ l'~tat d'oxydation 2 + en palladium ~ l'~tat d'oxydation z~ro et r~ cup~rer le palladium pr~cipit~.
Metivier Pascal
Simonato Jean-Pierre
Rhodia Polyamide Intermediates
Robic
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