Method of preparing tetrarhodium dodecacarbonyl
AssigneeThe Dow Chemical Company
InventorDouglas L. Hunter
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Abstract
An improved process for making tetrarhodium dodecacarbonyl, Rh.sub.4 (CO).sub.12, reacts RhCl.sub.3.xH.sub.2 O with CO under about 200 psig (14.06 kg/cm.sup.2) at a temperature of about 50.degree. C. in the presence of copper metal and an alkali metal halide, e.g. NaCl. The product mixture is contacted with a chlorinated solvent, e.g. CH.sub.2 Cl.sub.2, which dissolves the desired product and is subsequently recovered by evaporating the solvent.
Claims4
In a process for preparing tetrarhodium dodecacarbonyl by reacting rhodium trichloride with carbon monoxide in the presence of activated copper metal and an alkali metal halide under a pressure greater than atmospheric, the improvement which comprises conducting the reaction at a pressure of from about 50 to about 500 psig (3.52 to 35.2 kg/cm.sup.2) and at a temperature of 25.degree.-75.degree. C. for a time of less than about two hours.
Dependencies are inferred from the claim text.