Process for hydroformylation with rhodium catalysts and the separation of rhodium therefrom

Abstract From the Canadian patent

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, (II), wherein A is alkyl alkoxy, hydroxyalkyl, aryl having 6-25 carbon atoms or, R7CONHCH2CH2CH2- wherein R7 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, …