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AssigneeRuhrchemie Aktiengesellschaft
InventorsBoy Cornils, Werner Konkol, Helmut Bahrmann, Hanswilhelm Bach, Ernest Wiebus, Wolfgang Lipps
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A process for separating rhodium from mixtures thereof, comprising extracting said rhodium with an aqueous solution of a rhodium complexing agent and a solubilizer. A process for preparing aldehydes in the presence of both the complexing agent and the solubilizer is also set forth. The solubilizer is generally selected from salts of carboxylic acids having 8-20 carbon atoms, alkyl sulfonates, alkyl aryl sulfonates, amines and quaternary ammonium compounds of Formula II ##STR1## wherein A is alkyl, alkoxy, hydroxyalkyl, aryl having 6-25 carbon atoms, or R.sup.7 CONHCH.sub.2 CH.sub.2 CH.sub.2 --wherein R.sup.7 is alkyl having 5-11 carbon atoms; B is an alkyl having 1-25 carbon atoms, an aryl having 6-25 carbon atoms, or an .omega.-hydroxy alkyl having 1-4 carbon atoms; C and D are each independently an alkyl or .omega.-hydroxy alkyl having 1-4 carbon atoms or form, together with each other and the bridging N, a 5 or 6 membered heterocyclic ring; E is a halide, sulfate, borate, sulfonate, lactate or citrate; and p is the number of charges on E. The rhodium complexing agent is preferably a triaryl phosphine carboxylate or sulfonate.
In a process for the production of aldehydes by hydroformylation by reaction of an olefin, carbon monoxide and hydrogen in the presence of water, the improvement comprising effecting the reaction in the presence of a quaternary ammonium solubilizer of the formula ##STR12## wherein A is a straight or branched alkyl, alkoxy, hydroxyalkyl, substituted or unsubstituted aryl having 6-25 carbon atoms, or R.sup.7 CONHCH.sub.2 CH.sub.2 CH.sub.2 -- wherein R.sup.7 is a straight or branched alkyl having 5-11 carbon atoms;
Dependencies are inferred from the claim text.