B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/72, 260/510.
B01J 38/62 (2006.01) B01J 23/92 (2006.01) B01J 23/94 (2006.01) B01J 38/00 (2006.01) C07C 51/265 (2006.01) C22B 3/16 (2006.01) C22B 7/00 (2006.01) C22B 23/02 (2006.01)
Patent
CA 2272370
Cobalt and/or manganese is recovered from the ash obtained following incineration of the catalyst containing residue arising from the liquid phase oxidation of an aromatic carboxylic acid such as terephthalic acid. Recovery is effected by contacting the ash with an organic acid or an organic acid anhydride such as acetic anhydride, optionally in the presence of bromide ions (e.g. HBr), so that the cobalt and/or manganese metals are recovered as monocarboxylic acid soluble salts thereof thus permitting recycle thereof to the liquid phase oxidation process.
Du cobalt et/ou du manganèse sont récupérés de la cendre obtenue après incinération du catalyseur contenant un résidu de l'oxydation en phase liquide d'un acide carboxylique aromatique, tel que l'acide téréphtalique. On effectue la récupération en mettant la cendre au contact d'un acide organique ou d'un anhydride d'acide organique, tel que l'anhydride acétique, éventuellement mis en présence d'ions de bromure (HBr, par exemple), de manière à récupérer les métaux, cobalt et/ou de manganèse, sous la forme de sels solubles d'acide monocarboxylique desdits métaux, ce qui permet de retourner lesdits métaux au processus d'oxydation en phase liquide.
Bartlett Julie Ann
Fairhurst Roger Gaskell
Royall David John
Bennett Jones Llp
E.i. Du Pont de Nemours And Company
Invista Technologies S.a.r.l.
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