Process for the continuous production of aromatic aldehydes

U.S. Patent Number: 5382694

Abstract: A process for the continuous production of aromatic aldehydes of the formula (1) ##STR1## in which Ar is an aryl radical, R.sup.1, R.sup.2 and R.sup.3 independently of one another are hydrogen, fluorine, chlorine or bromine atoms, in which dichloromethyl-substituted aromatics of the formula (2) ##STR2## in which Ar, R.sup.1, R.sup.2, R.sup.3 have the above meanings, are continuously hydrolyzed with an aqueous solution of one or more catalysts of the formula (3) in which M is a transition metal selected from the group comprising iron, nickel, copper, chromium, thallium, zinc and mercury, X is F, Cl, Br, I, OH, SO.sub.4, PO.sub.4 or NO.sub.3, and n depending on the oxidation state of the transition metal M is the number 1, 2, 3 or 4, in a concentration of from about 1 to about 50%, based on the weight of water in the catalyst solution, at temperatures of from about 70.degree. to about 160.degree. C.

Inventors: Billeb; Gilbert (Kelkheim/Taunus, DE), Folz; Georg (Frankfurt am Main, DE)

Assignee: Hoechst Aktiengesellschaft (Frankfurt, DE)

Application Number: 08/156,601

Issued: 1995-01-17

Expired: 2007-01-17

Classes: 568/437 ; 568/426; 568/433

Field of search: 568/437,433,426

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