Procedure for the preparation of dibasic acids from washings...

C - Chemistry – Metallurgy – 07 – C

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C07C 55/14 (2006.01) C07C 51/27 (2006.01) C07C 51/31 (2006.01) C07C 51/487 (2006.01)

Patent

CA 2222367

This invention concerns a procedure for preparing dibasic acids or mixtures of dibasic acids from aqueous solutions produced by the washing of cyclohexane oxidation products. This procedure makes it possible to obtain adipic acid of sufficient purity to be used as an intermediate product in the synthesis of polyamide-6.6 for textile fibers, as well as mixtures of good quality glutamic and succinic adipic acids. More precisely, this invention involves a procedure for the preparation of aliphatic dibasic acids which involves the following steps: (a) at least partial deperoxidation of the washings by catalytic hydrogenation, at a temperature between 0°C and 100 C°, in the presence of at least one platinum group metal, and (b) using nitric acid to oxidize the products found in the washings after deperoxidization.

La présente invention concerne un procédé de préparation de diacides ou de mélanges de diacides à partir des solutions aqueuses provenant du lavage des produits d'oxydation du cyclohexane. Ce procédé permet d'obtenir l'acide adipique ayant une pureté suffisante pour être utilisé comme intermédiaire de synthèse du polyamide-6,6 pour les fibres textiles ainsi que les mélange des acides adipiques glutamique et succinique de bonne qualité. Plus précisément, la présente invention consiste en un procédé de préparation de diacides aliphatiques, caractérisé en ce que l'on effectue les étapes suivantes: a) on déperoxyde au moins partiellement lesdites eaux de lavage, en les soumettant à une hydrogénation catalytique à une température comprise entre 0°C et 100°C, en présence d'au moins un métal choisi dans le groupe du platine; et b) on oxyde à l'aide d'acide nitrique les produits contenus dans les eaux de lavage après déperoxydation.

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