Abstract
Hydrogenation of maleic anhydride using various homogeneous transition metal complex catalyst system has been investigated. It was observed that RhCl(PPh 3) 3 was the most active catalyst precursor for the hydrogenation of maleic anhydride to succinic anhydride. The optimum ligand and solvent were PPh 3 and ethylene glycol dimethylether, respectively. The effects of PPh 3:Rh mole ratio, temperature and pressure of H 2 have been studied. The typical experimental conditions are: temperature, 353–383 K; pressure of H 2, 0.5–2.5 MPa; PPh 3:RhCl(PPh 3) 3, 0–16; RhCl(PPh 3) 3, 0.03 mmol; maleic anhydride, 20 mmol; volume of liquid, 8 ml; reaction time, 30–360 min. Under these experimental conditions, succinic anhydride was the only product, and the highest yield (99.0%) was obtained. A reasonable reaction mechanism is proposed.
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