Separation and Use of Water-insoluble Ammonium Ligands in Hydroformylation

Separation and Use of Water-insoluble Ammonium Ligands in Hydroformylation 

By using water-insoluble ammonium ligands, the advantages of both catalyst systems (easy separation under mild reaction conditions and high conversion rate) can be combined while avoiding their disadvantages. Thus, hydroformylation with 

Reaction conditions olefinic feedstock, n-l-tetradecene pressure, 50 bar Rh concentration, 20 ppm temperature, 125 °C reaction time, 3 h solvent, acetone. 

T Triisooctylamine salts of p-sulfonated phosphorous acid triphenyl ester. 

In this case the potential functionality of the ligands is applied to induce a phase transition of ligands and Rh complexes and subsequent phase separation by a pH change after the reaction at room temperature under mild conditions. The principle is outlined in Eqs. (4) and (5)  

---